asp.net自定义日历控件，兼容Asp.net ajax

•  Asp.net Ajax版本：

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Drawing;
using System.Web;
using System.Text;
namespace SmartCalendar
...{
        /// <summary>
    /// 名称:SmartCalendar
    /// 版本:2.0(该版本支持Asp.net Ajax，在Asp.net Ajax RC1版本测试通过)
    /// 作者:小青青
    /// @CopyRight:2006 不得用于商业用途
    /// </summary>
    [DefaultProperty("Value"),
    ToolboxData("<{0}:SmartCalendar runat=server></{0}:SmartCalendar>")]
    public class SmartCalendar : WebControl, INamingContainer
    ...{
        TextBox txtValue = new TextBox();
        CalendarFormat _DateFormat;

        protected override void OnInit(EventArgs e)
        ...{
            
            this.Controls.Add(txtValue);
            if(ReadOnly)
                txtValue.Attributes.Add("ReadOnly", string.Empty);
            txtValue.Style.Add(HtmlTextWriterStyle.FontFamily, "arial");
            txtValue.Style.Add(HtmlTextWriterStyle.FontSize, "11px");
            txtValue.Style.Add(HtmlTextWriterStyle.Width, "82px");
            if (!Page.IsPostBack)
                Value = DateTime.Now;
        }

        public enum CalendarFormat ...{ Chinese, Standard }
        /**//// <summary>
        /// 设置或获取控件是否为只读
        /// </summary>
        [DefaultValue(true), Bindable(true), Themeable(true)]
        public virtual bool ReadOnly
        ...{
            get
            ...{
                object obj1 = this.ViewState["ReadOnly"];
                if (obj1 != null)
                ...{
                    return (bool)obj1;
                }
                return true;
            }
            set
            ...{
                this.ViewState["ReadOnly"] = value;
            }
        }
 

        /**//// <summary>
        /// 设置或获取控件是否可用
        /// </summary>
        [DefaultValue(true), Bindable(true), Themeable(false)]
        public override bool Enabled
        ...{
            get
            ...{
                return base.Enabled;
            }
            set
            ...{
                base.Enabled = value;

                txtValue.Enabled = value;

            }
        }


        /**//// <summary>
        /// 设置或获取控件的日期格式
        /// </summary>
        [DefaultValue(IPTO.Web.SmartCalendar.CalendarFormat.Chinese), Themeable(true),Bindable(true)]
        public CalendarFormat DateFormat
        ...{

            get
            ...{

                return _DateFormat;

            }
            set
            ...{

                _DateFormat = value;

            }

        }
        /**//// <summary>
        /// 获取或设置控件的日期值，如果日期不符合规则，将默认为当天
        /// </summary>
        public DateTime Value
        ...{

            get ...{

                try
                ...{
                    string tmp = txtValue.Text;

                    if (!string.IsNullOrEmpty(tmp))
                    ...{
                        tmp = tmp.Replace("年", "-");
                        tmp = tmp.Replace("月", "-");
                        tmp = tmp.Replace("日", "-");
                    }

                    string[] strList = tmp.Split(new string[]...{"-"}, StringSplitOptions.RemoveEmptyEntries);
                    
                    if(strList.Length == 3)
                        return new DateTime(int.Parse(strList[0]), int.Parse(strList[1]), int.Parse(strList[2]));
                    else
                        return DateTime.Now;

                }
                catch
                ...{

                    return DateTime.Now;
                
                }

            }
            set ...{

                if (DateFormat == CalendarFormat.Chinese)
                ...{
                    txtValue.Text = value.Year.ToString() + "年";
                    txtValue.Text += value.Month.ToString() + "月";
                    txtValue.Text += value.Day.ToString() + "日";
                }
                else
                ...{

                    txtValue.Text = value.Year.ToString() + "-";
                    txtValue.Text += value.Month.ToString() + "-";
                    txtValue.Text += value.Day.ToString() + "-";
                
                }
            
            }
        
        }

        protected override void Render(HtmlTextWriter writer)
        ...{
            StringBuilder sb = new StringBuilder();
            writer.Write("<div id='" + this.ClientID + "div' align='left' style='z-index:999;width:109px;'>");
            txtValue.RenderControl(writer);

            sb.Append("<input UNSELECTABLE type='button' HIDEFOCUS value='i' style='font-family:webdings;height:20px;font-size:13px;cursor:hand' onclick="if(" + this.ClientID + "cal.style.display!=&#39;none&#39;)" + this.ClientID + "cal.style.display=&#39;none&#39;;else " + this.ClientID + "cal.style.display=&#39;&#39;;"><BR/></div>");

            writer.Write(sb.ToString());

            

        }

        public string InitializeScript
        ...{

            get
            ...{
                StringBuilder sb = new StringBuilder();
                sb.Append("<script>");
                sb.Append("try{var htm1 ="<div UNSELECTABLE id='" + this.ClientID + "cal' style='border:solid 1px #35A2E5;display:none; width:200px;position:absolute;filter:progid:DXImageTransform.Microsoft.dropshadow(OffX=5, OffY=5,Color=#aaaaaa, Positive=true);'>"; ");
                sb.Append("htm1+="<IFRAME width=200 height=43 border=0 style='position:absolute; z-index:-1; display:block'></IFRAME>"; ");
                sb.Append("htm1+="<div UNSELECTABLE style='background-color:#35A2E5;height:32px;padding:10px 5px 0px 12px'>"; ");
                sb.Append("htm1+="<LABEL UNSELECTABLE onmousedown='PreMonth(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlMonth&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;])' title='上一月' style='cursor:hand;font-size:12px' onmouseover='this.style.color=&#39;white&#39;' onmouseout='this.style.color=&#39;&#39;'>▲</LABEL>"; ");
                sb.Append("htm1+="<SELECT UNSELECTABLE ID='" + this.ClientID + "ddlMonth' style='font-size:12px;'  onchange='monthCur=this.options[this.selectedIndex].value-1;RenderDate(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlMonth&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;]);'/></SELECT>"; ");
                sb.Append("htm1+="<LABEL UNSELECTABLE onmousedown='NextMonth(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlMonth&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;])' title='下一月' style='cursor:hand;font-size:13px' onmouseover='this.style.color=&#39;white&#39;' onmouseout='this.style.color=&#39;&#39;'>▼</LABEL>"; ");
                sb.Append("htm1+="<LABEL UNSELECTABLE onmousedown='PreYear(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlMonth&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;])' title='上一年' style='cursor:hand;font-size:12px' onmouseover='this.style.color=&#39;white&#39;' onmouseout='this.style.color=&#39;&#39;'>▲</LABEL>"; ");
                sb.Append("htm1+="<SELECT UNSELECTABLE ID='" + this.ClientID + "ddlYear' style='font-size:12px;'  onchange='yearCur=this.options[this.selectedIndex].value-1;RenderDate(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlYear&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;]);'/></SELECT>"; ");
                sb.Append("htm1+="<LABEL UNSELECTABLE onmousedown='NextYear(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlMonth&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;])' title='下一月' style='cursor:hand;font-size:13px' onmouseover='this.style.color=&#39;white&#39;' onmouseout='this.style.color=&#39;&#39;'>▼</LABEL>"; ");
                sb.Append("htm1+="</div><div id='" + this.ClientID + "main'></div></div></div>"; ");
                sb.Append("document.all['" + this.ClientID + "div'].innerHTML+=htm1;}catch(e){}</script> ");
                sb.Append("<script>try{yearCur=" + Value.Year.ToString() + ";monthCur=" + (Value.Month - 1).ToString() + ";init(document.all['" + this.ClientID + "ddlYear'], document.all['" + this.ClientID + "ddlMonth'],'" + txtValue.UniqueID + "', document.all['" + this.ClientID + "main']);}catch(e){}</script> ");

                return sb.ToString();

            }

        }

        protected override void OnPreRender(EventArgs e)
        ...{

            StringBuilder sb = new StringBuilder("var today=new Date(); ");
            sb.Append("var dateNow=today.getDate(); ");
            sb.Append("var monthNow=today.getMonth(); ");
            sb.Append("var yearNow=today.getYear(); ");
            sb.Append("var dateCur=today.getDate(); ");
            sb.Append("var monthCur=today.getMonth(); ");
            sb.Append("var yearCur=today.getYear(); ");
            sb.Append("var yearMax=2050; ");
            sb.Append("var yearMin=1990; ");
            sb.Append("var months= new Array("一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"); ");
            sb.Append("var weeks= new Array("星期一","星期二","星期三","星期四","星期五","星期六","星期日"); ");
            sb.Append(" ");
            //initialize method
            sb.Append("function init(oy,om,ovalue,omain){ ");
            sb.Append("  for(var i=yearMin;i<=yearMax;i++){ ");
            sb.Append("      var oOption = document.createElement("OPTION"); ");
            sb.Append("      oOption.text=i; ");
            sb.Append("      oOption.value=i; ");
            sb.Append("      oy.add(oOption); ");
            sb.Append("      } ");
            sb.Append("  for(var i=0;i<months.length;i++){ ");
            sb.Append("      var oOption = document.createElement("OPTION"); ");
            sb.Append("      oOption.text=months[i]; ");
            sb.Append("      oOption.value=i + 1; ");
            sb.Append("      om.add(oOption); ");
            sb.Append("  } ");
            sb.Append("  SetDropDown(yearCur,monthCur,oy,om,ovalue,omain); ");
            sb.Append("} ");
            sb.Append("function RenderDate(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  var y=yearCur; ");
            sb.Append("  var m=monthCur; ");
            sb.Append("  var d=dateCur; ");
            sb.Append("  var dayfirst=new Date(y,m,1).getDay();//每个月的第一天星期几 ");
            sb.Append("  var datefirst=1-dayfirst;//每个月的第一个日期，应为第一天减去第一天的星期几 ");
            sb.Append("  var TABLE_B="<TABLE UNSELECTABLE width='200px' cellspacing=0 cellpadding=2 style='background:#F4FBFE;border-collapse: separate;text-align:center;font-size:11px;font-family:arial'>"; ");
            sb.Append("  var TABLE_B1="<TABLE UNSELECTABLE width='200px' cellspacing=0 cellpadding=1 style='background:#F4FBFE;border-collapse: separate;text-align:center;font-size:11px;font-family:arial;border-top:solid 2px #35A2E5;'>"; ");
            sb.Append("  var TR_FIRST="<TR><TD><B>日</B></TD><TD><B>一</B></TD><TD><B>二</B></TD><TD><B>三</B></TD><TD><B>四</B></TD><TD><B>五</B></TD><TD><B>六</B></TD></TR><TR height='2px'>"; ");
            sb.Append("  var EMPTY_CELL="<TD>&nbsp;</TD>"; ");
            sb.Append("  var TD_B="<TD style='cursor:hand;' onmouseover=/"this.style.background='#D8EAFC'/" onmouseout=/"this.style.background='#F4FBFE'/" "; ");
            sb.Append("  var TD_E="</TD>"; ");
            sb.Append("  var TR_B="<TR>"; ");
            sb.Append("  var TR_E="</TR>"; ");
            sb.Append("  var TABLE_E="</TABLE>" ");
            sb.Append("  var LINK_DATE_M="/">" ");
            sb.Append("  var LINK_DATE_E="</A>"; ");
            sb.Append("  var IRM1="<IFRAME width=200 height=130 border=0 style='position:absolute; z-index:-1; display:block'></IFRAME>"; ");
            sb.Append("  var IRM2="<IFRAME width=200 height=147 border=0 style='position:absolute; z-index:-1; display:block'></IFRAME>"; ");
            sb.Append("  var htm; ");
            sb.Append("  htm = TABLE_B; ");
            sb.Append("  htm += TR_FIRST; ");
            sb.Append("  htm += TABLE_E; ");
            sb.Append("  htm += TABLE_B1; ");
            sb.Append("  //begin ");
            sb.Append("  var count=ComputeDateCount(y,m);var rCount=0; ");
            sb.Append("  while(datefirst<=count) ");
            sb.Append("  { ");
            sb.Append("      rCount++; ");
            sb.Append("      htm += TR_B; ");
            sb.Append("      for(var i=1;i<=7;i++) ");
            sb.Append("      { ");
            sb.Append("          if (datefirst<=0) ");
            sb.Append("              htm += EMPTY_CELL; ");
            sb.Append("          else if (datefirst>count) ");
            sb.Append("              htm += EMPTY_CELL; ");
            sb.Append("          else ");

            if (DateFormat == CalendarFormat.Chinese)
            ...{
                sb.Append("          if (yearCur==yearNow && monthCur==monthNow && dateCur==datefirst) ");
                sb.Append("              htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "年" + (m+1) + "月" + datefirst + "日'/">" + "<B><A style='cursor:hand;' >" + datefirst + LINK_DATE_E + TD_E + "</B>"; ");
                sb.Append("          else ");
                sb.Append("              if (i==7) ");
                sb.Append("                 htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "年" + (m+1) + "月" + datefirst + "日'/">" + "<A style='cursor:hand;color:green' >" + datefirst + LINK_DATE_E + TD_E; ");
                sb.Append("              else if(i==1) ");
                sb.Append("                  htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "年" + (m+1) + "月" + datefirst + "日'/">" + "<A style='cursor:hand;color:red' >" + datefirst + LINK_DATE_E + TD_E; ");
                sb.Append("              else ");
                sb.Append("                  htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "年" + (m+1) + "月" + datefirst + "日'/">" + "<A style='cursor:hand;' >" + datefirst + LINK_DATE_E + TD_E; ");
            }
            else 
            ...{
                sb.Append("          if (yearCur==yearNow && monthCur==monthNow && dateCur==datefirst) ");
                sb.Append("              htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "-" + (m+1) + "-" + datefirst + "'/">" + "<B><A style='cursor:hand;' >" + datefirst + LINK_DATE_E + TD_E + "</B>"; ");
                sb.Append("          else ");
                sb.Append("              if (i==7) ");
                sb.Append("                 htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "-" + (m+1) + "-" + datefirst + "'/">" + "<A style='cursor:hand;color:green' >" + datefirst + LINK_DATE_E + TD_E; ");
                sb.Append("              else if(i==1) ");
                sb.Append("                  htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "-" + (m+1) + "-" + datefirst + "'/">" + "<A style='cursor:hand;color:red' >" + datefirst + LINK_DATE_E + TD_E; ");
                sb.Append("              else ");
                sb.Append("                  htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "-" + (m+1) + "-" + datefirst + "'/">" + "<A style='cursor:hand;' >" + datefirst + LINK_DATE_E + TD_E; ");
            }
            sb.Append("         datefirst++; ");
            sb.Append("      } ");
            sb.Append("  } ");
            sb.Append("  htm += TR_E; ");
            sb.Append("  htm += TABLE_E; ");
            sb.Append("  htm += TABLE_B; ");
            sb.Append("  htm += TR_B + "<TD colspan='7'><input style='height:100%;width:100%;cursor:hand;background:#D8EAFC;border:solid 1px #35A2E5;font-family:arial;font-size:12px' HIDEFOCUS type='button' onclick='SetToday(/""+oy.id+"/",/""+om.id+"/",/""+ovalue+"/",/""+omain.id+"/")' value='今天："+yearNow+'年'+(monthNow+1)+'月'+dateNow+'日' + weeks[new Date().getDay()-1] +"'></TD>" + TR_E; ");
            sb.Append("  htm += TABLE_E; ");
            sb.Append("  if(rCount==5) ");
            sb.Append("     htm = IRM1 + htm; ");
            sb.Append("  else ");
            sb.Append("     htm = IRM2 + htm; ");
            sb.Append("  omain.innerHTML = htm; ");
            sb.Append("} ");
            sb.Append("function SetToday(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            if (DateFormat == CalendarFormat.Chinese)
                sb.Append("  document.all[ovalue].value=yearNow+'年'+(monthNow+1)+'月'+dateNow+'日'; ");
            else
                sb.Append("  document.all[ovalue].value=yearNow+'-'+(monthNow+1)+'-'+dateNow; ");
            sb.Append("  yearCur=yearNow; ");
            sb.Append("  monthCur=monthNow; ");
            sb.Append("  dateCur=dateNow; ");
            sb.Append("  SetDropDown(yearNow,monthNow,document.all[oy],document.all[om],ovalue,document.all[omain]); ");
            sb.Append("} ");
            sb.Append("function PreYear(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  if (yearCur>yearMin) ");
            sb.Append("  { ");
            sb.Append("      yearCur--; ");
            sb.Append("      SetDropDown(yearCur,monthCur,oy,om,ovalue,omain); ");
            sb.Append("  } ");
            sb.Append("} ");
            sb.Append("function NextYear(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  if (yearCur<yearMax) ");
            sb.Append("  { ");
            sb.Append("      yearCur++; ");
            sb.Append("      SetDropDown(yearCur,monthCur,oy,om,ovalue,omain); ");
            sb.Append("  } ");
            sb.Append("} ");
            sb.Append("function PreMonth(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  if (monthCur>0) ");
            sb.Append("  { ");
            sb.Append("      monthCur--; ");
            sb.Append("      SetDropDown(yearCur,monthCur,oy,om,ovalue,omain); ");
            sb.Append("  } ");
            sb.Append(" } ");
            sb.Append("function NextMonth(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  if (monthCur<11) ");
            sb.Append("  { ");
            sb.Append("      monthCur++; ");
            sb.Append("      SetDropDown(yearCur,monthCur,oy,om,ovalue,omain); ");
            sb.Append("  } ");
            sb.Append("} ");
            sb.Append("function SetDropDown(y,m,oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  for(var i=0;i<oy.options.length;i++) ");
            sb.Append("  { ");
            sb.Append("      if(oy.options[i].value==y) ");
            sb.Append("          oy.options[i].selected=true; ");
            sb.Append("  } ");
            sb.Append("  for(var i=0;i<om.options.length;i++) ");
            sb.Append("  { ");
            sb.Append("      if(om.options[i].value==m+1) ");
            sb.Append("          om.options[i].selected=true; ");
            sb.Append("  } ");
            sb.Append("  RenderDate(oy,om,ovalue,omain); ");
            sb.Append("} ");
            sb.Append("function ComputeDateCount(y,m) ");
            sb.Append("{ ");
            sb.Append("  var count; ");
            sb.Append("  switch (parseInt(m+1)) ");
            sb.Append("  { ");
            sb.Append("      case 1: ");
            sb.Append("      case 3: ");
            sb.Append("      case 5: ");
            sb.Append("      case 7: ");
            sb.Append("      case 8: ");
            sb.Append("      case 10: ");
            sb.Append("      case 12: ");
            sb.Append("          count=31; ");
            sb.Append("          break; ");
            sb.Append("      case 2: ");
            sb.Append("          if(IsLeapYear(y)) ");
            sb.Append("          { ");
            sb.Append("              count=29; ");
            sb.Append("              break; ");
            sb.Append("          } ");
            sb.Append("          else ");
            sb.Append("          { ");
            sb.Append("              count=28; ");
            sb.Append("              break; ");
            sb.Append("          } ");
            sb.Append("      default: ");
            sb.Append("          count=30; ");
            sb.Append("          break; ");
            sb.Append("  } ");
            sb.Append("  return count; ");
            sb.Append("} ");
            sb.Append("function IsLeapYear(y) ");
            sb.Append("{ ");
            sb.Append("  if (y%400==0||((y%4)==0&&(y%100)!=0)) ");
            sb.Append("      return true; ");
            sb.Append("  return false; ");
            sb.Append("} ");


            if (!Page.ClientScript.IsClientScriptBlockRegistered("Calendar"))
                Page.ClientScript.RegisterClientScriptBlock(Page.GetType(), "Calendar", sb.ToString(), true);

      
            base.OnPreRender(e);
        }
        
        
    }
}

• 由于Asp.net Ajax对于后台输出Javascript有较大限制，所以请注意以下几点：

1. 在Page_Load方法中加入以下代码：（请注意要将该段代码放在IsPostBack的判断语句之外）
   //smartCalendar为控件实例
   //updatePanel为Asp.net AjaxUpdatePanel控件
   //以下为Asp.net Ajax RC1版本代码
   System.Web.UI.ScriptManager.RegisterStartupScript(updatePanel, updatePanel.GetType(), smartCalendar.UniqueID, smartCalendar.InitializeScript, false);
2. 如果页面中使用了类似于MutiView、View的控件，请确保第一个页面中一定有SmartCalendar控件，否则会有Javascript异常；如果第一页中不需要日历控件也请将其拖拽到页面上，可以通过将其加入到一个Style="display:none"的Div中，来实现日历控件的隐藏。

• 非Asp.net Ajax版本：

 

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Drawing;
using System.Web;
using System.Text;
namespace IPTO.Web
...{
    /**//// <summary>
    /// 名称:SmartCalendar
    /// 版本:2.0(该版本不支持Asp.net Ajax)
    /// 作者:小青青
    /// @CopyRight: 2006 不得用于商业用途
    /// </summary>
    [DefaultProperty("Value"),
    ToolboxData("<{0}:SmartCalendar runat=server></{0}:SmartCalendar>")]
    public class SmartCalendar : WebControl, INamingContainer
    ...{
        TextBox txtValue = new TextBox();
        CalendarFormat _DateFormat;
        protected override void OnInit(EventArgs e)
        ...{
            
            this.Controls.Add(txtValue);
            if(ReadOnly)
                txtValue.Attributes.Add("ReadOnly", string.Empty);
            txtValue.Style.Add(HtmlTextWriterStyle.FontFamily, "arial");
            txtValue.Style.Add(HtmlTextWriterStyle.FontSize, "11px");
            txtValue.Style.Add(HtmlTextWriterStyle.Width, "82px");
            if (!Page.IsPostBack)
                Value = DateTime.Now;
        }

        public enum CalendarFormat ...{ Chinese, Standard }
        /**//// <summary>
        /// 设置或获取控件是否为只读
        /// </summary>
        [DefaultValue(true), Bindable(true), Themeable(true)]
        public virtual bool ReadOnly
        ...{
            get
            ...{
                object obj1 = this.ViewState["ReadOnly"];
                if (obj1 != null)
                ...{
                    return (bool)obj1;
                }
                return true;
            }
            set
            ...{
                this.ViewState["ReadOnly"] = value;
            }
        }
 

        /**//// <summary>
        /// 设置或获取控件是否可用
        /// </summary>
        [DefaultValue(true), Bindable(true), Themeable(false)]
        public override bool Enabled
        ...{
            get
            ...{
                return base.Enabled;
            }
            set
            ...{
                base.Enabled = value;

                txtValue.Enabled = value;

            }
        }


        /**//// <summary>
        /// 设置或获取控件的日期格式
        /// </summary>
        [DefaultValue(IPTO.Web.SmartCalendar.CalendarFormat.Chinese), Themeable(true),Bindable(true)]
        public CalendarFormat DateFormat
        ...{

            get
            ...{

                return _DateFormat;

            }
            set
            ...{

                _DateFormat = value;

            }

        }
        /**//// <summary>
        /// 获取或设置控件的日期值，如果日期不符合规则，将默认为当天
        /// </summary>
        public DateTime Value
        ...{

            get ...{

                try
                ...{
                    string tmp = txtValue.Text;

                    if (!string.IsNullOrEmpty(tmp))
                    ...{
                        tmp = tmp.Replace("年", "-");
                        tmp = tmp.Replace("月", "-");
                        tmp = tmp.Replace("日", "-");
                    }

                    string[] strList = tmp.Split(new string[]...{"-"}, StringSplitOptions.RemoveEmptyEntries);
                    
                    if(strList.Length == 3)
                        return new DateTime(int.Parse(strList[0]), int.Parse(strList[1]), int.Parse(strList[2]));
                    else
                        return DateTime.Now;

                }
                catch
                ...{

                    return DateTime.Now;
                
                }

            }
            set ...{

                if (DateFormat == CalendarFormat.Chinese)
                ...{
                    txtValue.Text = value.Year.ToString() + "年";
                    txtValue.Text += value.Month.ToString() + "月";
                    txtValue.Text += value.Day.ToString() + "日";
                }
                else
                ...{

                    txtValue.Text = value.Year.ToString() + "-";
                    txtValue.Text += value.Month.ToString() + "-";
                    txtValue.Text += value.Day.ToString() + "-";
                
                }
            
            }
        
        }

        protected override void Render(HtmlTextWriter writer)
        ...{
            StringBuilder sb = new StringBuilder();
            writer.Write("<div id='" + this.ClientID + "div' align='left' style='z-index:999;width:109px;'>");
            txtValue.RenderControl(writer);

            sb.Append("<input UNSELECTABLE type='button' HIDEFOCUS value='i' style='font-family:webdings;height:20px;font-size:13px;cursor:hand' onclick="if(" + this.ClientID + "cal.style.display!=&#39;none&#39;)" + this.ClientID + "cal.style.display=&#39;none&#39;;else " + this.ClientID + "cal.style.display=&#39;&#39;;"><BR/>");
            sb.Append("<script>");
            sb.Append("var htm1 ="<div UNSELECTABLE id='" + this.ClientID + "cal' style='border:solid 1px #35A2E5;display:none; width:200px;position:absolute;filter:progid:DXImageTransform.Microsoft.dropshadow(OffX=5, OffY=5,Color=#aaaaaa, Positive=true);'>";");
            sb.Append("htm1+="<IFRAME width=200 height=43 border=0 style='position:absolute; z-index:-1; display:block'></IFRAME>";");
            sb.Append("htm1+="<div UNSELECTABLE style='background-color:#35A2E5;height:32px;padding:10px 5px 0px 12px'>";");
            sb.Append("htm1+="<LABEL UNSELECTABLE onmousedown='PreMonth(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlMonth&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;])' title='上一月' style='cursor:hand;font-size:12px' onmouseover='this.style.color=&#39;white&#39;' onmouseout='this.style.color=&#39;&#39;'>▲</LABEL>";");
            sb.Append("htm1+="<SELECT UNSELECTABLE ID='" + this.ClientID + "ddlMonth' style='font-size:12px;'  onchange='monthCur=this.options[this.selectedIndex].value-1;RenderDate(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlMonth&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;]);'/></SELECT>";");
            sb.Append("htm1+="<LABEL UNSELECTABLE onmousedown='NextMonth(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlMonth&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;])' title='下一月' style='cursor:hand;font-size:13px' onmouseover='this.style.color=&#39;white&#39;' onmouseout='this.style.color=&#39;&#39;'>▼</LABEL>";");
            sb.Append("htm1+="<LABEL UNSELECTABLE onmousedown='PreYear(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlMonth&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;])' title='上一年' style='cursor:hand;font-size:12px' onmouseover='this.style.color=&#39;white&#39;' onmouseout='this.style.color=&#39;&#39;'>▲</LABEL>";");
            sb.Append("htm1+="<SELECT UNSELECTABLE ID='" + this.ClientID + "ddlYear' style='font-size:12px;'  onchange='yearCur=this.options[this.selectedIndex].value-1;RenderDate(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlYear&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;]);'/></SELECT>";");
            sb.Append("htm1+="<LABEL UNSELECTABLE onmousedown='NextYear(document.all[&#39;" + this.ClientID + "ddlYear&#39;], document.all[&#39;" + this.ClientID + "ddlMonth&#39;],&#39;" + txtValue.UniqueID + "&#39;, document.all[&#39;" + this.ClientID + "main&#39;])' title='下一月' style='cursor:hand;font-size:13px' onmouseover='this.style.color=&#39;white&#39;' onmouseout='this.style.color=&#39;&#39;'>▼</LABEL>";");
            sb.Append("htm1+="</div><div id='" + this.ClientID + "main'></div></div></div>";");
            sb.Append("document.all['" + this.ClientID + "div'].innerHTML+=htm1;</script>");
            sb.Append("<script>yearCur=" + Value.Year.ToString() + ";monthCur=" + (Value.Month - 1).ToString() + ";init(document.all['" + this.ClientID + "ddlYear'], document.all['" + this.ClientID + "ddlMonth'],'" + txtValue.UniqueID + "', document.all['" + this.ClientID + "main']);</script>");

            writer.Write(sb.ToString());

        }
        protected override void OnPreRender(EventArgs e)
        ...{

            StringBuilder sb = new StringBuilder("var today=new Date(); ");
            sb.Append("var dateNow=today.getDate(); ");
            sb.Append("var monthNow=today.getMonth(); ");
            sb.Append("var yearNow=today.getYear(); ");
            sb.Append("var dateCur=today.getDate(); ");
            sb.Append("var monthCur=today.getMonth(); ");
            sb.Append("var yearCur=today.getYear(); ");
            sb.Append("var yearMax=2050; ");
            sb.Append("var yearMin=1990; ");
            sb.Append("var months= new Array("一月","二月","三月","四月","五月","六月","七月","八月","九月","十月","十一月","十二月"); ");
            sb.Append("var weeks= new Array("星期一","星期二","星期三","星期四","星期五","星期六","星期日"); ");
            sb.Append(" ");
            //initialize method
            sb.Append("function init(oy,om,ovalue,omain){ ");
            sb.Append("  for(var i=yearMin;i<=yearMax;i++){ ");
            sb.Append("      var oOption = document.createElement("OPTION"); ");
            sb.Append("      oOption.text=i; ");
            sb.Append("      oOption.value=i; ");
            sb.Append("      oy.add(oOption); ");
            sb.Append("      } ");
            sb.Append("  for(var i=0;i<months.length;i++){ ");
            sb.Append("      var oOption = document.createElement("OPTION"); ");
            sb.Append("      oOption.text=months[i]; ");
            sb.Append("      oOption.value=i + 1; ");
            sb.Append("      om.add(oOption); ");
            sb.Append("  } ");
            sb.Append("  SetDropDown(yearCur,monthCur,oy,om,ovalue,omain); ");
            sb.Append("} ");
            sb.Append("function RenderDate(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  var y=yearCur; ");
            sb.Append("  var m=monthCur; ");
            sb.Append("  var d=dateCur; ");
            sb.Append("  var dayfirst=new Date(y,m,1).getDay();//每个月的第一天星期几 ");
            sb.Append("  var datefirst=1-dayfirst;//每个月的第一个日期，应为第一天减去第一天的星期几 ");
            sb.Append("  var TABLE_B="<TABLE UNSELECTABLE width='200px' cellspacing=0 cellpadding=2 style='background:#F4FBFE;border-collapse: separate;text-align:center;font-size:11px;font-family:arial'>"; ");
            sb.Append("  var TABLE_B1="<TABLE UNSELECTABLE width='200px' cellspacing=0 cellpadding=1 style='background:#F4FBFE;border-collapse: separate;text-align:center;font-size:11px;font-family:arial;border-top:solid 2px #35A2E5;'>"; ");
            sb.Append("  var TR_FIRST="<TR><TD><B>日</B></TD><TD><B>一</B></TD><TD><B>二</B></TD><TD><B>三</B></TD><TD><B>四</B></TD><TD><B>五</B></TD><TD><B>六</B></TD></TR><TR height='2px'>"; ");
            sb.Append("  var EMPTY_CELL="<TD>&nbsp;</TD>"; ");
            sb.Append("  var TD_B="<TD style='cursor:hand;' onmouseover=/"this.style.background='#D8EAFC'/" onmouseout=/"this.style.background='#F4FBFE'/" "; ");
            sb.Append("  var TD_E="</TD>"; ");
            sb.Append("  var TR_B="<TR>"; ");
            sb.Append("  var TR_E="</TR>"; ");
            sb.Append("  var TABLE_E="</TABLE>" ");
            sb.Append("  var LINK_DATE_M="/">" ");
            sb.Append("  var LINK_DATE_E="</A>"; ");
            sb.Append("  var IRM1="<IFRAME width=200 height=130 border=0 style='position:absolute; z-index:-1; display:block'></IFRAME>"; ");
            sb.Append("  var IRM2="<IFRAME width=200 height=147 border=0 style='position:absolute; z-index:-1; display:block'></IFRAME>"; ");
            sb.Append("  var htm; ");
            sb.Append("  htm = TABLE_B; ");
            sb.Append("  htm += TR_FIRST; ");
            sb.Append("  htm += TABLE_E; ");
            sb.Append("  htm += TABLE_B1; ");
            sb.Append("  //begin ");
            sb.Append("  var count=ComputeDateCount(y,m);var rCount=0; ");
            sb.Append("  while(datefirst<=count) ");
            sb.Append("  { ");
            sb.Append("      rCount++; ");
            sb.Append("      htm += TR_B; ");
            sb.Append("      for(var i=1;i<=7;i++) ");
            sb.Append("      { ");
            sb.Append("          if (datefirst<=0) ");
            sb.Append("              htm += EMPTY_CELL; ");
            sb.Append("          else if (datefirst>count) ");
            sb.Append("              htm += EMPTY_CELL; ");
            sb.Append("          else ");

            if (DateFormat == CalendarFormat.Chinese)
            ...{
                sb.Append("          if (yearCur==yearNow && monthCur==monthNow && dateCur==datefirst) ");
                sb.Append("              htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "年" + (m+1) + "月" + datefirst + "日'/">" + "<B><A style='cursor:hand;' >" + datefirst + LINK_DATE_E + TD_E + "</B>"; ");
                sb.Append("          else ");
                sb.Append("              if (i==7) ");
                sb.Append("                 htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "年" + (m+1) + "月" + datefirst + "日'/">" + "<A style='cursor:hand;color:green' >" + datefirst + LINK_DATE_E + TD_E; ");
                sb.Append("              else if(i==1) ");
                sb.Append("                  htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "年" + (m+1) + "月" + datefirst + "日'/">" + "<A style='cursor:hand;color:red' >" + datefirst + LINK_DATE_E + TD_E; ");
                sb.Append("              else ");
                sb.Append("                  htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "年" + (m+1) + "月" + datefirst + "日'/">" + "<A style='cursor:hand;' >" + datefirst + LINK_DATE_E + TD_E; ");
            }
            else 
            ...{
                sb.Append("          if (yearCur==yearNow && monthCur==monthNow && dateCur==datefirst) ");
                sb.Append("              htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "-" + (m+1) + "-" + datefirst + "'/">" + "<B><A style='cursor:hand;' >" + datefirst + LINK_DATE_E + TD_E + "</B>"; ");
                sb.Append("          else ");
                sb.Append("              if (i==7) ");
                sb.Append("                 htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "-" + (m+1) + "-" + datefirst + "'/">" + "<A style='cursor:hand;color:green' >" + datefirst + LINK_DATE_E + TD_E; ");
                sb.Append("              else if(i==1) ");
                sb.Append("                  htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "-" + (m+1) + "-" + datefirst + "'/">" + "<A style='cursor:hand;color:red' >" + datefirst + LINK_DATE_E + TD_E; ");
                sb.Append("              else ");
                sb.Append("                  htm += TD_B + "onclick=/"dateCur="+datefirst+";document.all['"+ovalue+"'].value='" + y + "-" + (m+1) + "-" + datefirst + "'/">" + "<A style='cursor:hand;' >" + datefirst + LINK_DATE_E + TD_E; ");
            }
            sb.Append("         datefirst++; ");
            sb.Append("      } ");
            sb.Append("  } ");
            sb.Append("  htm += TR_E; ");
            sb.Append("  htm += TABLE_E; ");
            sb.Append("  htm += TABLE_B; ");
            sb.Append("  htm += TR_B + "<TD colspan='7'><input style='height:100%;width:100%;cursor:hand;background:#D8EAFC;border:solid 1px #35A2E5;font-family:arial;font-size:12px' HIDEFOCUS type='button' onclick='SetToday(/""+oy.id+"/",/""+om.id+"/",/""+ovalue+"/",/""+omain.id+"/")' value='今天："+yearNow+'年'+(monthNow+1)+'月'+dateNow+'日' + weeks[new Date().getDay()-1] +"'></TD>" + TR_E; ");
            sb.Append("  htm += TABLE_E; ");
            sb.Append("  if(rCount==5) ");
            sb.Append("     htm = IRM1 + htm; ");
            sb.Append("  else ");
            sb.Append("     htm = IRM2 + htm; ");
            sb.Append("  omain.innerHTML = htm; ");
            sb.Append("} ");
            sb.Append("function SetToday(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            if (DateFormat == CalendarFormat.Chinese)
                sb.Append("  document.all[ovalue].value=yearNow+'年'+(monthNow+1)+'月'+dateNow+'日'; ");
            else
                sb.Append("  document.all[ovalue].value=yearNow+'-'+(monthNow+1)+'-'+dateNow; ");
            sb.Append("  yearCur=yearNow; ");
            sb.Append("  monthCur=monthNow; ");
            sb.Append("  dateCur=dateNow; ");
            sb.Append("  SetDropDown(yearNow,monthNow,document.all[oy],document.all[om],ovalue,document.all[omain]); ");
            sb.Append("} ");
            sb.Append("function PreYear(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  if (yearCur>yearMin) ");
            sb.Append("  { ");
            sb.Append("      yearCur--; ");
            sb.Append("      SetDropDown(yearCur,monthCur,oy,om,ovalue,omain); ");
            sb.Append("  } ");
            sb.Append("} ");
            sb.Append("function NextYear(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  if (yearCur<yearMax) ");
            sb.Append("  { ");
            sb.Append("      yearCur++; ");
            sb.Append("      SetDropDown(yearCur,monthCur,oy,om,ovalue,omain); ");
            sb.Append("  } ");
            sb.Append("} ");
            sb.Append("function PreMonth(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  if (monthCur>0) ");
            sb.Append("  { ");
            sb.Append("      monthCur--; ");
            sb.Append("      SetDropDown(yearCur,monthCur,oy,om,ovalue,omain); ");
            sb.Append("  } ");
            sb.Append(" } ");
            sb.Append("function NextMonth(oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  if (monthCur<11) ");
            sb.Append("  { ");
            sb.Append("      monthCur++; ");
            sb.Append("      SetDropDown(yearCur,monthCur,oy,om,ovalue,omain); ");
            sb.Append("  } ");
            sb.Append("} ");
            sb.Append("function SetDropDown(y,m,oy,om,ovalue,omain) ");
            sb.Append("{ ");
            sb.Append("  for(var i=0;i<oy.options.length;i++) ");
            sb.Append("  { ");
            sb.Append("      if(oy.options[i].value==y) ");
            sb.Append("          oy.options[i].selected=true; ");
            sb.Append("  } ");
            sb.Append("  for(var i=0;i<om.options.length;i++) ");
            sb.Append("  { ");
            sb.Append("      if(om.options[i].value==m+1) ");
            sb.Append("          om.options[i].selected=true; ");
            sb.Append("  } ");
            sb.Append("  RenderDate(oy,om,ovalue,omain); ");
            sb.Append("} ");
            sb.Append("function ComputeDateCount(y,m) ");
            sb.Append("{ ");
            sb.Append("  var count; ");
            sb.Append("  switch (parseInt(m+1)) ");
            sb.Append("  { ");
            sb.Append("      case 1: ");
            sb.Append("      case 3: ");
            sb.Append("      case 5: ");
            sb.Append("      case 7: ");
            sb.Append("      case 8: ");
            sb.Append("      case 10: ");
            sb.Append("      case 12: ");
            sb.Append("          count=31; ");
            sb.Append("          break; ");
            sb.Append("      case 2: ");
            sb.Append("          if(IsLeapYear(y)) ");
            sb.Append("          { ");
            sb.Append("              count=29; ");
            sb.Append("              break; ");
            sb.Append("          } ");
            sb.Append("          else ");
            sb.Append("          { ");
            sb.Append("              count=28; ");
            sb.Append("              break; ");
            sb.Append("          } ");
            sb.Append("      default: ");
            sb.Append("          count=30; ");
            sb.Append("          break; ");
            sb.Append("  } ");
            sb.Append("  return count; ");
            sb.Append("} ");
            sb.Append("function IsLeapYear(y) ");
            sb.Append("{ ");
            sb.Append("  if (y%400==0||((y%4)==0&&(y%100)!=0)) ");
            sb.Append("      return true; ");
            sb.Append("  return false; ");
            sb.Append("} ");


            if (!Page.ClientScript.IsClientScriptBlockRegistered("Calendar"))
                Page.ClientScript.RegisterClientScriptBlock(Page.GetType(), "Calendar", sb.ToString(), true);

      
            base.OnPreRender(e);
        }
        
        
    }
}

http://blog.csdn.net/justinalucard/archive/2006/12/22/1453372.aspx

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