C#自定义改写GridView的分页控件功能

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Reflection;
using System.Text.RegularExpressions;

namespace ZLDK.JXGL.WebControls
{  
    [ToolboxData("<{0}:uGridView runat=server></{0}:uGridView>")]
    public class uGridView : GridView, iuControl
    {
        //委托事件
        public delegate void SelectNumberEventHandler(SelectNumberEventArgs e);

        private static int summaryCount = 0; //保存其数量值
        private Paging.PagingStyleCollection _pagingStyle; //是否要进行分页


        #region 构造函数
        public uGridView(): base()
        {
            ViewState["IsHandle"] = true;
            ViewState["IsFixHeader"] = true;
            // 新增“uGridView_RowDataBound”事件处理
            this.RowDataBound += new GridViewRowEventHandler(uGridView_RowDataBound);
        }
        #endregion

        #region 属性
        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue("")]
        [Localizable(true)]
        public string CodeID
        {
            get
            {
                String s = (String)ViewState["CodeID"];
                return ((s == null) ? String.Empty : s);
            }

            set
            {
                ViewState["CodeID"] = value;
            }
        }

        [Description("是否可以使用")]
        [DefaultValue(true)]
        public override bool Enabled
        {
            get
            {
               
                return base.Enabled;
            }
            set
            {
                if (IsHandle)
                    base.Enabled = value;
            }
        }

        [Bindable(true)]
        [Category("Appearance")]
        [DefaultValue(true)]
        [Localizable(true)]
        [Description("是否可以编程控制Enabled")]
        public bool IsHandle
        {
            get
            {
                return (bool)ViewState["IsHandle"];
            }

            set
            {
                ViewState["IsHandle"] = value;
            }
        }

        /// <summary>
        /// 是否固定表头？
        /// </summary>
        [Description("是否固定表头？"), Category("扩展"), DefaultValue(false), NotifyParentProperty(true)]
        public virtual bool IsFixHeader
        {
            get { return (bool)ViewState["IsFixHeader"]; }
            set { ViewState["IsFixHeader"] = value; }
        }
        
        //获取记录总数
        [Description("数据总数"), DefaultValue("0"), Category("扩展")]
        public int SummaryCount
        {
            get { return summaryCount; }
            set { summaryCount = value; }
        }

        // 自定义分页样式     
        [Description("自定义分页样式"), DefaultValue("default"), Category("扩展")]
        public Paging.PagingStyleCollection PagingStyle
        {
            get { return _pagingStyle; }
            set { _pagingStyle = value; }
        }

        #endregion

        #region 数据绑定事件

        protected void uGridView_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            //固定表头
            if (this.IsFixHeader && e.Row.RowType == DataControlRowType.Header)
            {
                for (int j = 0; j < e.Row.Cells.Count; j++)
                {
                    e.Row.Cells[j].Attributes.Add("style", " position: relative; top: expression(this.offsetParent.scrollTop-1);");
                }
            }
        }

        #endregion

        #region 固定表头

        protected override int CreateChildControls(System.Collections.IEnumerable dataSource, bool dataBinding)
        {
            if (dataSource == null)
            {
                DataControlField[] fieldArray = new DataControlField[this.Columns.Count];
                this.Columns.CopyTo(fieldArray, 0);

                if (fieldArray != null && fieldArray.Length > 0)
                {
                    if (this.ShowHeader && (this.HeaderRow == null))
                    {
                        GridViewRow headerRow = null;
                        if (this.HeaderRow == null)
                        {
                            headerRow = this.CreateRow(-1, -1, DataControlRowType.Header, DataControlRowState.Normal);
                            this.InitializeRow(headerRow, fieldArray);
                            FieldInfo field = typeof(System.Web.UI.WebControls.GridView).GetField("_headerRow", BindingFlags.NonPublic | BindingFlags.Instance);
                            if (field != null)
                            {
                                field.SetValue(this, headerRow);
                            }
                            Table headerTable = this.CreateChildTable();
                            headerTable.Rows.Add(headerRow);
                            Controls.Add(headerTable);
                        }
                        else
                        {
                            headerRow = this.HeaderRow;
                        }

                        GridViewRowEventArgs args = new GridViewRowEventArgs(headerRow);

                        this.OnRowCreated(args);
                        if (dataBinding)
                        {
                            headerRow.DataBind();
                            this.OnRowDataBound(args);
                            headerRow.DataItem = null;
                        }
                    }
                }
                return 0;
            }
            else
            {
                return base.CreateChildControls(dataSource, dataBinding);
            }
        }
        #endregion

        #region 创建分页的各个控件
        /// <summary>
        /// 创建分页的各个控件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnRowCreated(GridViewRowEventArgs e)
        {
            #region 自定义分页样式

            if (e.Row.RowType == DataControlRowType.Pager && PagingStyle == Paging.PagingStyleCollection.Default)
            {
                LinkButton First = new LinkButton();
                First.ID = "First";
                First.ToolTip = "首页";
                First.CausesValidation = false;
                LinkButton Prev = new LinkButton();
                Prev.ID = "Prev";
                Prev.ToolTip = "后一页";
                Prev.CausesValidation = false;
                LinkButton Next = new LinkButton();
                Next.ID = "Next";
                Next.ToolTip = "前一页";
                Next.CausesValidation = false;
                LinkButton Last = new LinkButton();
                Last.ID = "Last";
                Last.ToolTip = "尾页";
                Last.CausesValidation = false;
                TableCell tc = new TableCell();

                e.Row.Controls.Clear();

                #region “首页 上一页 下一页 尾页”按钮
                if (!String.IsNullOrEmpty(PagerSettings.FirstPageImageUrl))
                {
                    First.Text = "<img src='" + ResolveUrl(PagerSettings.FirstPageImageUrl) + "' border='0'/>";
                }
                else
                {
                    First.Text = PagerSettings.FirstPageText;
                   // First.Text = "&lt;font face='webdings'&gt;9&lt;/font&gt;";

                }
                First.CommandName = "First";
                First.Font.Underline = false;

                if (!String.IsNullOrEmpty(PagerSettings.PreviousPageImageUrl))
                {
                    Prev.Text = "<img src='" + ResolveUrl(PagerSettings.PreviousPageImageUrl) + "' border='0'/>";
                }
                else
                {
                    Prev.Text = PagerSettings.PreviousPageText;
                   // Prev.Text = "&lt;font face='webdings'&gt;3&lt;/font&gt;";
                }
                Prev.CommandName = "Prev";
                Prev.Font.Underline = false;


                if (!String.IsNullOrEmpty(PagerSettings.NextPageImageUrl))
                {
                    Next.Text = "<img src='" + ResolveUrl(PagerSettings.NextPageImageUrl) + "' border='0'/>";
                }
                else
                {
                   Next.Text = PagerSettings.NextPageText;
                   //Next.Text = "&lt;font face='webdings'&gt;4&lt;/font&gt;";
                }
                Next.CommandName = "Next";
                Next.Font.Underline = false;

                if (!String.IsNullOrEmpty(PagerSettings.LastPageImageUrl))
                {
                    Last.Text = "<img src='" + ResolveUrl(PagerSettings.LastPageImageUrl) + "' border='0'/>";
                }
                else
                {
                    Last.Text = PagerSettings.LastPageText;
                    //Last.Text = "&lt;font face='webdings'&gt;:&lt;/font&gt;";
                }
                Last.CommandName = "Last";
                Last.Font.Underline = false;


                tc.Controls.Add(First);
                tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
                tc.Controls.Add(Prev);
                tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));

                if (this.PageIndex <= 0)
                {
                    First.Enabled = Prev.Enabled = false;
                }
                else
                {
                    First.Enabled = Prev.Enabled = true;
                }
                tc.Controls.Add(Next);
                tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));
                tc.Controls.Add(Last);
                tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;"));

                if (this.PageIndex >= PageCount - 1)
                {
                    Next.Enabled = Last.Enabled = false;
                }
                else
                {
                    Next.Enabled = Last.Enabled = true;
                }
                #endregion

                #region 显示总记录数 每页记录数 当前页数/总页数 /和加TextBox Button DropDownList控件

                tc.Controls.Add(new LiteralControl((PageIndex + 1).ToString()));
                tc.Controls.Add(new LiteralControl("/"));
                tc.Controls.Add(new LiteralControl(PageCount.ToString()));
                tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;共<b>"));
                tc.Controls.Add(new LiteralControl(SummaryCount.ToString()));
                tc.Controls.Add(new LiteralControl("</b>条记录&nbsp;&nbsp;到"));
                //添加输入框和按纽
                TextBox txbDigit = new TextBox();
                txbDigit.ID = "txbDigit";
                txbDigit.Style.Add("width", "18px");
                //txbDigit.Style.Add("height", "20px"); //height:20px;
                tc.Controls.Add(txbDigit);
                Button btnGoto = new Button();
                btnGoto.ID = "btnGoto";
                btnGoto.Text = "Go";
                btnGoto.ToolTip = "查询";
                btnGoto.Style.Add("cursor", "hand");
                //btnGoto.Style.Add("height", "25px");
                btnGoto.CommandName = "goto";
                btnGoto.CausesValidation = false;
                tc.Controls.Add(btnGoto);
                tc.Controls.Add(new LiteralControl("&nbsp;&nbsp;每页显示"));
                //使用下拉框来进行
                DropDownList ddlList = new DropDownList();
                ddlList.ID = "ddlList";
                ddlList.Items.Add(new ListItem("10", "10"));
                ddlList.Items.Add(new ListItem("20", "20"));
                ddlList.Items.Add(new ListItem("30", "30"));
                ddlList.Items.Add(new ListItem("40", "40"));
                ddlList.Items.Add(new ListItem("50", "50"));
                ddlList.SelectedValue = PageSize.ToString(); //显示行数
                ddlList.Style.Add("Width", "40px");
                ddlList.AutoPostBack = true; //触发其响应事件
                ddlList.SelectedIndexChanged += new EventHandler(DropDownList_SelectChanged);
                tc.Controls.Add(ddlList);
                tc.Controls.Add(new LiteralControl("条记录"));
                #endregion

                tc.ColumnSpan = this.Columns.Count;
                PagerStyle.HorizontalAlign = HorizontalAlign.Right; // 分页栏显示在右边
                e.Row.Controls.Add(tc);
             
            }


            #endregion
            base.OnRowCreated(e);
        }

        #endregion

        #region LinkButton和button的事件处理

        protected override void OnRowCommand(GridViewCommandEventArgs e)
        {
            //处理每个控件的事件，让前台来进行接收处理
            GridViewRow pagerRow = this.BottomPagerRow;
            LinkButton lbFirst = (LinkButton)pagerRow.FindControl("First");
            LinkButton lbPrev = (LinkButton)pagerRow.FindControl("Prev");
            LinkButton lbNext = (LinkButton)pagerRow.FindControl("Next");
            LinkButton lbLast = (LinkButton)pagerRow.FindControl("Last");

            bool flag = true; //通过使用标识来判断
            switch (e.CommandName)
            {
                case "First":
                    this.PageIndex = 0;
                    lbFirst.Enabled = lbPrev.Enabled = false;
                    lbNext.Enabled = lbLast.Enabled = true;
                    flag = true;

                    break;
                case "Prev":
                    if (PageIndex >= 1)
                    {
                        this.PageIndex = PageIndex - 1;
                        lbFirst.Enabled = lbPrev.Enabled = true;
                    }
                    else
                    {
                        lbFirst.Enabled = lbPrev.Enabled = true;
                    }
                    lbNext.Enabled = lbLast.Enabled = true;
                    flag = true;
                    break;
                case "Next":
                    if (PageIndex < PageCount - 1)
                    {
                        this.PageIndex = PageIndex + 1;
                        lbNext.Enabled = lbLast.Enabled = true;
                    }
                    else
                    {
                        lbNext.Enabled = lbLast.Enabled = false;
                    }
                    lbFirst.Enabled = lbPrev.Enabled = true;
                    flag = true;
                    break;
                case "Last":
                    this.PageIndex = PageCount - 1;
                    lbFirst.Enabled = lbPrev.Enabled = true;
                    lbNext.Enabled = lbLast.Enabled = false;
                    flag = true;
                    break;
                case "goto":
                    TextBox txbContent = (TextBox)this.BottomPagerRow.FindControl("txbDigit");
                    //使用正则表达式,验证输入的值
                    Match match = Regex.Match(txbContent.Text.Trim(), @"^[1-" + PageCount + "]$");
                    if (match.Success)
                    {
                        this.PageIndex = Convert.ToInt32(match.Value) - 1;
                        flag = true;
                    }
                    else
                    {
                        flag = false;
                    }
                    break;
            }
            //调用前台事件
            if (flag)
            {
                //重新加载数据
                EventArgs ea = new EventArgs();
                DataBindingClick(this, ea);

            }


            base.OnRowCommand(e);
        }

        #endregion

        #region 触发更新事件，用于LinkButtn和Button是触发事件

        public event EventHandler ButtonClick;

        protected virtual void DataBindingClick(object sender, EventArgs e)
        {
            if (ButtonClick != null)
            {
                ButtonClick(sender, e);
            }
        }
  
        #endregion

        #region dropdownlist的事件处理

        public event SelectNumberEventHandler SelectNumber;

        protected virtual void SelectNumberChanged(SelectNumberEventArgs e)
        {
            if (SelectNumber != null)
            {
                SelectNumber(e);
            }
        }


        //把DropDownList选择得值返回给前台，让其进行操作，存入一个类中
        protected void DropDownList_SelectChanged(object sender, EventArgs e)
        {
            DropDownList ddlSelect = sender as DropDownList;
            SelectNumberEventArgs selectNum = new SelectNumberEventArgs(Convert.ToInt32(ddlSelect.SelectedValue));
            SelectNumberChanged(selectNum);

        }


        #endregion


       
        /// <summary>
        ///  注册控件有scriptManager的页面，这样几个控件才能激活，它必须在Gridview绑定后才能注册
        /// </summary>
        /// <param name="smRegister">注册的对象</param>
        public void RegisterControl(ScriptManager smRegister)
        {
            try
            {
                //注册触发控件
                GridViewRow gvr = this.BottomPagerRow;
                smRegister.RegisterAsyncPostBackControl(gvr.Cells[0].FindControl("First"));
                smRegister.RegisterAsyncPostBackControl(gvr.Cells[0].FindControl("Prev"));
                smRegister.RegisterAsyncPostBackControl(gvr.Cells[0].FindControl("Next"));
                smRegister.RegisterAsyncPostBackControl(gvr.Cells[0].FindControl("Last"));
                smRegister.RegisterAsyncPostBackControl(gvr.Cells[0].FindControl("btnGoto"));
                smRegister.RegisterAsyncPostBackControl(gvr.Cells[0].FindControl("ddlList"));
            }
            catch
            { }

        }
    }

    /// <summary>
    /// 自定义分页相关
    /// </summary>
    public class Paging
    {
        /// <summary>
        /// 自定义分页样式
        /// </summary>
        public enum PagingStyleCollection
        {
            /// <summary>
            /// 不用自定义分页样式
            /// </summary>
            None,
            /// <summary>
            /// 默认自定义分页样式
            /// </summary>
            Default
        }
    }

    //用来存储dropdownList选择的数据
    public   class SelectNumberEventArgs: EventArgs
    {
        private int selectDigit;
        public SelectNumberEventArgs(int digit)
        {
            selectDigit = digit;
        }

        public int SelectNum
        {
            get
            {
                return selectDigit;
            }
        }
    }
}
 直接引用该uGridView，如果要想产生分页效果，那么几个属性必须设置
一个是AllowPaging="True" 和PagingStyle="default"
然后在HTML代码中加入样式，是指“首页、尾页”的显示样式
<PagerSettings  
            FirstPageText="&lt;font face='webdings'&gt;9&lt;/font&gt;" PreviousPageText="&lt;font face='webdings'&gt;3&lt;/font&gt;"
            NextPageText="&lt;font face='webdings'&gt;4&lt;/font&gt;" LastPageText="&lt;font face='webdings'&gt;:&lt;/font&gt;" />

然后对该uGridView两个事件进行代码操作，主要就是重新绑定数据源

    //加载客户信息
    private void setGridView(int pageSize)
    {
        try
        {   
           //根据选择条件得到数据
           clsST_JC_KHXX[] st_xx=ywJC_KHXX.stSelectOuterKeyJC_KHXX("2");
            if (st_xx == null)
            {
                uGridView1.DataSource = null;
                uGridView1.DataBind();
                return;
            }
  //绑定数据源共有多少条记录，并在分页栏中显示
            uGridView1.SummaryCount = st_xx.Length;
//判断是否有每页显示的记录有否改变，如果改变必须把值直接赋给PageSize
            if (pageSize != 0)
            {
                uGridView1.PageSize = pageSize; 
            }
            uGridView1.DataSource = st_xx;
            uGridView1.DataBind();
            
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

双击uGridView中ButtonClick（LinkButton、Button的触发）和SelectNumber（DropDownList）事件
在ButtonClick事件下直接重新绑定

    protected void GridView1_ButtonClick(object sender, EventArgs e)
    {
        setGridView(0);
    }

在SelectNumber事件下

    protected void GridView1_SelectNumber(ZLDK.JXGL.WebControls.SelectNumberEventArgs e)
    {
        setGridView(e.SelectNum); //e.SelectNum是dropDownList选择的值，              //ZLDK.JXGL.WebControls是命名控件下类SelectNumberEventArgs
    }