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选择输入日期控件源代码

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using System;
using System.Collections;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Text;
using System.Web.UI.HtmlControls;

namespace MyQuery.MyControl
{
    /// <summary>
    /// MyDate 选择输入日期控件
    /// </summary> 
    [DefaultProperty("Text"),
        ParseChildren(false),
        PersistChildren(false),
        Description("专用于ASP.Net Web应用程序的日期控件"),
        Designer(typeof(MyDateDesigner)),
        ToolboxData("<{0}:MyDate runat=server></{0}:MyDate>")]
    public class MyDate : Panel, INamingContainer, IPostBackDataHandler
    {
        #region 属性
        /// <summary>
        /// 获取/设置日期值。
        /// </summary>
        [Bindable(true),
        Browsable(true),
        Description("日期值（格式：YYYY-MM-DD hh:mm或YYYY年MM月DD日hh时ss分）默认为当前日期"),
        Category("外观"),
        DefaultValue("")]
        public string Text
        {
            get
            {
                if (ViewState["Text"] != null)
                {
                    return ViewState["Text"].ToString();
                }
                else
                {
                    if (IsNull)
                    {
                        return "";
                    }
                    else
                    {
                        DateTime date = System.DateTime.Today;
                        if (IsDate)
                        {
                            return date.ToString("yyyy-MM-dd", System.Globalization.DateTimeFormatInfo.InvariantInfo);
                        }
                        else
                        {
                            return date.ToString("yyyy-MM", System.Globalization.DateTimeFormatInfo.InvariantInfo);
                        }
                    }
                }
            }

            set
            {
                if (IsDate)
                {
                    DateTime date;
                    if (!IsNull && String.IsNullOrEmpty(value))
                    {
                        value = System.DateTime.Today.ToString("yyyy-MM-dd", System.Globalization.DateTimeFormatInfo.InvariantInfo);
                    }
                    if (value.IndexOf("年") > 0)
                    {
                        value = value.Replace("年", "-").Replace("月", "-").Replace("日", " ").Replace("时", ":").Replace("分", ":");
                    }
                    if (String.IsNullOrEmpty(value) || value.IndexOf("1900") == 0)
                    {
                        ViewState["Text"] = "";
                    }
                    else
                    {
                        try
                        {
                            date = Convert.ToDateTime(value);
                        }
                        catch
                        {
                            date = System.DateTime.Today;
                        }
                        if (IsHour)
                        {
                            ViewState["Text"] = date.ToString("yyyy-MM-dd HH:mm:ss", System.Globalization.DateTimeFormatInfo.InvariantInfo);
                        }
                        else
                        {
                            ViewState["Text"] = date.ToString("yyyy-MM-dd", System.Globalization.DateTimeFormatInfo.InvariantInfo);
                        }
                    }
                }
                else
                {
                    ViewState["Text"] = value;
                }
            }
        }
        /// <summary>
        /// 获取日期值。
        /// </summary>
        [Browsable(true),
        Description("日期值(日期型)"),
        Category("外观"),
        DefaultValue(0)]
        public DateTime Date
        {
            get
            {
                if (ViewState["Text"] != null)
                {
                    return Convert.ToDateTime(ViewState["Text"].ToString());
                }
                else
                {
                    return System.DateTime.Today;
                }
            }
        }
        /// <summary>
        /// 获取/设置日期值是否允许空。
        /// </summary>
        [Browsable(true),
        Description("日期值是否允许空"),
        Category("布局"),
        DefaultValue(false)]
        public bool IsNull
        {
            get
            {
                object obj = ViewState["IsNull"];
                return (obj == null) ? false : (bool)obj;
            }

            set
            {
                if (value)
                    ViewState["IsNull"] = true;
            }
        }
        /// <summary>
        /// 获取/设置日期值是否为完整的年-月-日，否为年-月。
        /// </summary>
        [Browsable(true),
        Description("日期值是否为完整的年-月-日，否为年-月"),
        Category("布局"),
        DefaultValue(true)]
        public bool IsDate
        {
            get
            {
                object obj = ViewState["IsDate"];
                return (obj == null) ? true : (bool)obj;
            }

            set
            {
                if (!value)
                    ViewState["IsDate"] = false;
            }
        }
        /// <summary>
        /// 获取/设置日期值是否包含时间。
        /// </summary>
        [Browsable(true),
        Description("日期值中是否包含时间"),
        Category("布局"),
        DefaultValue(false)]
        public bool IsHour
        {
            get
            {
                object obj = ViewState["IsHour"];
                return (obj == null) ? false : (bool)obj;
            }

            set
            {
                if (value)
                {
                    ViewState["IsHour"] = true;
                    ViewState["IsDate"] = true;
                }
            }
        }
        /// <summary>
        /// 获取/设置日期值是否包含时间。
        /// </summary>
        [Browsable(true),
        Description("以表格呈现"),
        Category("布局"),
        DefaultValue(false)]
        public bool IsTable
        {
            get
            {
                object obj = ViewState["IsTable"];
                return (obj == null) ? false : (bool)obj;
            }

            set
            {
                if (value)
                {
                    ViewState["IsTable"] = true;
                }
            }
        }
        /// <summary>
        /// 获取/设置日期值能否编辑。
        /// </summary>
        [Browsable(true),
        Description("能否编辑"),
        Category("行为"),
        DefaultValue(true)]
        public override bool Enabled
        {
            get
            {
                object obj = ViewState["Enabled"];
                return (obj == null) ? true : (bool)obj;
            }

            set
            {
                if (!value)
                    ViewState["Enabled"] = false;
            }
        }
        /// <summary>
        /// 获取/设置日期值中可供选择的年份长度。
        /// </summary>
        [Browsable(true),
        Description("日期值中可供选择的年份长度"),
        Category("布局"),
        DefaultValue(100)]
        public int Length
        {
            get
            {
                object obj = ViewState["Length"];
                return (obj == null) ? 100 : (int)obj;
            }

            set
            {
                ViewState["Length"] = value;
            }
        }
        /// <summary>
        /// 获取/设置选择年份的结束值。
        /// </summary>
        [Browsable(true),
        Description("日期值中选择结束年份,当小于100时表示距今年数"),
        Category("布局"),
        DefaultValue(0)]
        public int End
        {
            get
            {
                object obj = ViewState["End"];
                int y;
                if (obj == null)
                {
                    y = System.DateTime.Today.Year;
                }
                else
                {
                    y = (int)obj;
                    if (y < 100)
                    {
                        y = System.DateTime.Today.Year + y;
                    }
                }
                return y;
            }

            set
            {
                ViewState["End"] = value;
            }
        }
        /// <summary>
        /// 获取选择年份的开始值。
        /// </summary>
        [Browsable(true),
        Description("日期值中选择开始年份"),
        Category("布局"),
        DefaultValue(2000)]
        public int Start
        {
            get { return End - Length; }

            set
            {
                int s = value;
                int y = System.DateTime.Today.Year;
                ViewState["Length"] = y - s;
                ViewState["End"] = y;
            }
        }

        #endregion

        #region 重写事件
        /// <summary>
        /// 重写OnLoad 方法。
        /// </summary>
        /// <param name="e">包含事件数据的 <see cref="EventArgs"/> 对象。</param>
        protected override void OnLoad(EventArgs e)
        {
            if (Page.IsPostBack)
            {
                string y = Page.Request.Form[this.UniqueID + "_year"];
                if (y != null)
                {
                    string m = Page.Request.Form[this.UniqueID + "_month"];
                    string d = Page.Request.Form[this.UniqueID + "_day"];
                    string h = Page.Request.Form[this.UniqueID + "_hour"];
                    string mi = Page.Request.Form[this.UniqueID + "_minute"];
                    if (y == "" || m == "" || d == "")
                    {
                        Text = "";
                    }
                    else
                    {
                        string str = y + "-" + m;
                        if (d != null)
                        {
                            str += "-" + d;
                        }
                        if (!String.IsNullOrEmpty(h))
                        {
                            if (!String.IsNullOrEmpty(mi))
                            {
                                str += " " + h + ":" + mi + ":0";
                            }
                            else
                            {
                                str += " " + h + ":00:0";
                            }
                        }
                        Text = str;
                    }
                }
            }
            base.OnLoad(e);
        }
        /// <summary>
        /// 重写<see cref="System.Web.UI.WebControls.WebControl.AddAttributesToRender"/> 方法，验证是否有form(runat=server)控件
        /// </summary>
        /// <param name="writer"></param>
        protected override void AddAttributesToRender(HtmlTextWriter writer)
        {
            if (this.Page != null)
                this.Page.VerifyRenderingInServerForm(this);
            base.AddAttributesToRender(writer);
        }
        /// <summary>
        /// 重写<see cref="System.Web.UI.Control.OnPreRender"/>方法。
        /// </summary>
        /// <param name="e">包含事件数据的 <see cref="EventArgs"/> 对象。</param>
        protected override void OnPreRender(EventArgs e)
        {
            string strJS = @"<script language=javascript>

//原创：贾世义 日期：2005-08-16 免费共享 v1.0
//邮箱：jsyhello76@126.com
//请尊重版权，可以随意使用，但请注明出处//

function InitYear(pName,start,length,y)
{
  var selYear=eval('document.forms[0].'+pName+'_year');
  var n=selYear.length;
  selYear.length=n+length+1;
  for (i=0;i<=length;i++)
  {
 selYear.options[n+i].value=(i+start);
 selYear.options[n+i].text=(i+start);
  }
  if (y==0)
  {
 selYear.selectedIndex =0;
  }
  else if ((y-start)<=length)
  {
 selYear.selectedIndex = n+Math.abs(y-start);
  }
  else
  {
 selYear.selectedIndex = length;
  }
}

function InitMonth(pName,m)
{
  var selMonth=document.getElementById(pName+'_month');
  var n=selMonth.length;
  selMonth.length=n+12;
  for (i=1;i<10;i++)
  {
 selMonth.options[n+i-1].value='0'+i;
 selMonth.options[n+i-1].text=i;
  }
  for (i=10;i<=12;i++)
  {
 selMonth.options[n+i-1].value=i;
 selMonth.options[n+i-1].text=i;
  } 
  if (m==0)
  {
 selMonth.selectedIndex=0;
  }
  else
  {
 selMonth.selectedIndex = n+m-1;
  }
}

function InitDay(pName,d)
{
  var selDay=document.getElementById(pName+'_day');
  var n=selDay.length;
  selDay.length=n+31;
  for (i=1;i<10;i++)
  {
 selDay.options[n+i-1].value='0'+i;
 selDay.options[n+i-1].text=i;
  }
  for (i=10;i<=31;i++)
  {
 selDay.options[n+i-1].value=i;
 selDay.options[n+i-1].text=i;
  } 
  if (d==0)
  {
 selDay.selectedIndex = 0;
  }
  else
  {
 selDay.selectedIndex = n+d-1;
  } 
  dateChange(pName);
}

function InitHour(pName,h)
{
  var selHour=document.getElementById(pName+'_hour');
  selHour.length=24;
  for (i=0;i<10;i++)
  {
 selHour.options[i].value='0'+i;
 selHour.options[i].text=i;
  }
  for (i=10;i<24;i++)
  {
 selHour.options[i].value=i;
 selHour.options[i].text=i;
  } 
 selHour.selectedIndex = h;
}

function InitMinute(pName,m)
{
  var selMinute=document.getElementById(pName+'_minute');
  selMinute.length=60;
  for (i=0;i<10;i++)
  {
 selMinute.options[i].value='0'+i;
 selMinute.options[i].text=i;
  }
  for (i=10;i<60;i++)
  {
 selMinute.options[i].value=i;
 selMinute.options[i].text=i;
  } 
  selMinute.selectedIndex = m;
}

function dateChange(pName)
{
 var selYear=eval('document.forms[0].'+pName+'_year');
 var year=selYear.options[selYear.selectedIndex].value;
 if (year!='')
 {
  var selMonth=document.getElementById(pName+'_month');
  var month=selMonth.options[selMonth.selectedIndex].value;
  if (month!='')
  {
    var date=new Date(year,month,0);
    var day=date.getDate();
    var selDay=document.getElementById(pName+'_day');
    var tmp=1;
    if (selDay.selectedIndex>0)
    {
  tmp=selDay.options[selDay.selectedIndex].value;
    }
    selDay.length=day;
    for (i=1;i<10;i++)
    {
  selDay.options[i-1].value='0'+i;
  selDay.options[i-1].text=i;
    }
    for (i=10;i<=day;i++)
    {
  selDay.options[i-1].value=i;
  selDay.options[i-1].text=i;
    } 
    if (tmp>day)
    {
  selDay.selectedIndex=day-1;
    }
    else
    {
  selDay.selectedIndex=tmp-1;
    } 
  }
 }
}

</script>";
            Page.ClientScript.RegisterClientScriptBlock(Page.GetType(), "EnableDays", strJS);
            base.OnPreRender(e);
        }
        /// <summary>
        /// 将此控件呈现给指定的输出参数。
        /// </summary>
        /// <param name="writer"> 要写出到的 HTML 编写器 </param>
        protected override void Render(HtmlTextWriter writer)
        {
            if (IsTable)
            {
                writer.Write("<table border=0 cellpadding=0 cellspacing=0><tr><td nowrap align=left>");
            }
            int y = 0;
            int m = 0;
            int d = 0;
            int h = 0;
            int mi = 0;
            string str = Text;
            if (str.Length >= 7)
            {
                y = Convert.ToInt32(str.Substring(0, 4));
                m = Convert.ToInt32(str.Substring(5, 2));
                if (str.Length >= 10)
                {
                    d = Convert.ToInt32(str.Substring(8, 2));
                }
                if (str.Length >= 13)
                {
                    h = Convert.ToInt32(str.Substring(11, 2));
                }
                if (str.Length >= 16)
                {
                    mi = Convert.ToInt32(str.Substring(14, 2));
                }
            }
            bool isDate = IsDate;
            if (Enabled)
            {
                bool isNull = IsNull;
                writer.Write("<select name='" + this.UniqueID + "_year'");
                if (isDate)
                {
                    writer.Write(" onchange=dateChange('" + this.UniqueID + "')");
                }
                writer.Write(">");
                if (isNull)
                {
                    writer.Write("<option value=''></option>");
                }
                writer.Write("</select>年");
                writer.Write("<select name='" + this.UniqueID + "_month'");
                if (isDate)
                {
                    writer.Write(" onchange=dateChange('" + this.UniqueID + "')");
                }
                writer.Write(">");
                if (isNull)
                {
                    writer.Write("<option value=''></option>");
                }
                writer.Write("</select>月");
                writer.Write(@"
<script language=javascript>
InitYear('" + this.UniqueID + "'," + Start.ToString() + "," + Length.ToString() + "," + y.ToString() + @");
InitMonth('" + this.UniqueID + "'," + m.ToString() + @");
</script>");
                if (isDate)
                {
                    writer.Write("<select name='" + this.UniqueID + "_day'>");
                    if (isNull)
                    {
                        writer.Write("<option value=''></option>");
                    }
                    writer.Write("</select>日");
                    writer.Write(@"
<script language=javascript>
InitDay('" + this.UniqueID + "'," + d.ToString() + @");
</script>");
                    if (IsHour)
                    {
                        writer.Write("<select name='" + this.UniqueID + "_hour'></select>时");
                        writer.Write(@"
<script language=javascript>
InitHour('" + this.UniqueID + "'," + h.ToString() + @");
</script>");
                        writer.Write("<select name='" + this.UniqueID + "_minute'></select>分");
                        writer.Write(@"
<script language=javascript>
InitMinute('" + this.UniqueID + "'," + mi.ToString() + @");
</script>");
                    }
                }
            }
            else
            {
                if (y == 0 || m == 0)
                {
                    writer.Write("&nbsp;");
                }
                else
                {
                    writer.Write(y.ToString() + "年" + m.ToString() + "月");
                    if (d != 0)
                    {
                        writer.Write(d.ToString() + "日");
                        if (h != 0)
                        {
                            writer.Write(h.ToString() + "时");
                            writer.Write(mi.ToString() + "分");
                        }
                    }
                }
            }
            if (IsTable)
            {
                writer.Write("</td></tr></table>");
            }
        }

        /// <summary>
        /// 数据变更触发事件
        /// </summary>
        public event EventHandler TextChanged;

        /// <summary>
        /// 当由类实现时，为 ASP.NET 服务器控件处理回发数据。
        /// </summary>
        /// <param name="postDataKey">控件的主要标识符</param>
        /// <param name="postCollection">所有传入名称值的集合</param>
        /// <returns>如果服务器控件的状态在回发发生后更改，则为 true；否则为 false。</returns>
        public virtual bool LoadPostData(string postDataKey, NameValueCollection postCollection)
        {
            String presentValue = Text;
            String postedValue = postCollection[postDataKey];

            if (presentValue == null || !presentValue.Equals(postedValue))
            {
                Text = postedValue;
                return true;
            }

            return false;
        }


        /// <summary>
        /// 当由类实现时，用信号要求服务器控件对象通知 ASP.NET 应用程序该控件的状态已更改。
        /// </summary>
        public virtual void RaisePostDataChangedEvent()
        {
            OnTextChanged(EventArgs.Empty);
        }

        /// <summary>
        /// 数据变更函数
        /// </summary>
        /// <param name="e">事件参数</param>
        protected virtual void OnTextChanged(EventArgs e)
        {
            if (TextChanged != null)
                TextChanged(this, e);
        }
        #endregion

    }
}

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