DataGrid自定义分页控件WebControl

用了DataGrid控件很长时间，觉得分页功能有限，比如，没有共有多少条记录的提示、定位到底第几页等等，可以用WebControl 模拟出来，但是每次用都需要拷贝同样的代码很繁琐，本人很懒，所决定写一个控件来解决，命名为DataGridNavigator;
代码如下：

using System;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Collections.Specialized;
using System.Collections;
using System.Data;
using System.Text;
using System.Reflection;

namespace HTCL.DataControl
{
    /**//// <summary>
    /// OnClick事件参数。
    /// </summary>
    public class DataNavigatorClickEventArgs : EventArgs
    {
        int _currentpageindex;

        /**//// <summary>
        /// DataGrid当前页索引号。
        /// </summary>
        public int CurrentPageIndex
        {
            get { return _currentpageindex; }
        }

        /**//// <summary>
        /// 初始化一个新的DataNavigatorClickEventArgs实例。
        /// </summary>
        /// <param name="currentpageindex">当前页索引号</param>
        public DataNavigatorClickEventArgs(int currentpageindex)
        {
            _currentpageindex = currentpageindex;
        }
    }

    /**//// <summary>
    /// DataNavigtor鼠标点击事件委托声明
    /// </summary>
    public delegate void ClickEventHandler(object sender, DataNavigatorClickEventArgs e);

    /**//// <summary>
    /// DataNavigator 的摘要说明。
    /// </summary>
    [DefaultProperty("Text"), 
        ToolboxData("<{0}:DataNavigator runat=server></{0}:DataNavigator>")]
    public class DataGridNavigator : System.Web.UI.WebControls.WebControl,IPostBackEventHandler
    {
//        private string text;
//        private int _pagecount, _currentpageindex, _totalrecord, _pagesize;
        private System.Web.UI.WebControls.DataGrid _datagrid;
        private DataSet _dataset;

        /**//// <summary>
        /// 当“首页”链接被点击时，事件产生。.
        /// </summary>
        //[ResDescription("FirstPageClick")]
        public event ClickEventHandler FirstPageClick;
        
        /**//// <summary>
        /// 当“上一页”链接被点击时，事件发生。
        /// </summary>
        //[ResDescription("PreviousPageClick")]
        public event ClickEventHandler PreviousPageClick;
        
        /**//// <summary>
        /// 当“下一页”链接被点击时，事件发生。
        /// </summary>
        //[ResDescription("NextPageClick")]
        public event ClickEventHandler NextPageClick;
        
        /**//// <summary>
        /// 当“末页”链接被点击时，事件发生。
        /// </summary>
        //[ResDescription("LastPageClick")]
        public event ClickEventHandler LastPageClick;
        
        /**//// <summary>
        /// 当“Go”链接被点击时，事件发生。
        /// </summary>
        //[ResDescription("GotoPageClick")]
        public event ClickEventHandler GotoPageClick;
        
        /**//// <summary>
        /// 显示错误信息对话框。
        /// </summary>
        /// <param name="Message">错误信息</param>
        private void ShowMessage(string Message)
        {
            if(!this.Page.IsStartupScriptRegistered("DataNavigatorError"))
            {
                StringBuilder sb = new StringBuilder();
            
                sb.Append("<script language=javascript>\n");
                sb.Append("window.alert('" + Message + "');\n");
                sb.Append("</script>");
            
                this.Page.RegisterStartupScript("DataNavigatorError",sb.ToString());
            }
        }

        /**//// <summary>
        /// 当点击“首页”链接时被访问。
        /// </summary>
        /// <param name="e">事件参数</param>
        protected virtual void OnFirstPageClick(DataNavigatorClickEventArgs e)
        {
            if (FirstPageClick != null)
                FirstPageClick(this, e);
            CurrentPageIndex = 0;
            DataGridDataBind();
        }
        
        /**//// <summary>
        /// 当点击“上一页”链接时被访问。
        /// </summary>
        /// <param name="e">事件参数</param>
        protected virtual void OnPreviousPageClick(DataNavigatorClickEventArgs e)
        {
            if (PreviousPageClick != null)
                PreviousPageClick(this, e);
            CurrentPageIndex --;
            DataGridDataBind();
        }

        /**//// <summary>
        /// 当点击“下一页”链接时被访问
        /// </summary>
        /// <param name="e">事件参数</param>
        protected virtual void OnNextPageClick(DataNavigatorClickEventArgs e)
        {
            if (NextPageClick != null)
                NextPageClick(this, e);
            CurrentPageIndex ++;
            DataGridDataBind();
        }
        
        /**//// <summary>
        /// 当点击“末页”链接时被访问
        /// </summary>
        /// <param name="e">事件参数</param>
        protected virtual void OnLastPageClick(DataNavigatorClickEventArgs e)
        {
            if (LastPageClick != null)
                LastPageClick(this, e);
            CurrentPageIndex = PageCount - 1;
            DataGridDataBind();
        }
        
        /**//// <summary>
        /// 当点击“Go”链接时被访问
        /// </summary>
        /// <param name="e">事件参数</param>
        protected virtual void OnGotoPageClick(DataNavigatorClickEventArgs e)
        {
            if (GotoPageClick != null)
                GotoPageClick(this,e);

            if ((e.CurrentPageIndex >= 0 ) & (e.CurrentPageIndex < PageCount))
            {
                CurrentPageIndex = e.CurrentPageIndex;
                DataGridDataBind();
            }
        }

        /**//// <summary>
        /// 
        /// Enables a server control to process an event raised when a form is posted to server.
        /// </summary>
        /// <param name="eventArgument"></param>
        public virtual void RaisePostBackEvent(string eventArgument)
        {
            int temp;
            switch(eventArgument)
            {
                    // 点击的“首页”链接
                case"FirstPage":
                    this.OnFirstPageClick(new DataControl.DataNavigatorClickEventArgs(0));
                    break;
                    // 点击的“上一页”链接
                case "PreviousPage":
                    this.OnPreviousPageClick(new DataControl.DataNavigatorClickEventArgs(CurrentPageIndex));
                    break;
                    // 点击的“下一页”链接
                case "NextPage":
                    this.OnNextPageClick(new DataControl.DataNavigatorClickEventArgs(CurrentPageIndex));
                    break;
                    // 点击的“末页”链接
                case "LastPage":
                    this.OnLastPageClick(new DataControl.DataNavigatorClickEventArgs(PageCount));
                    break;
                    // 点击的“Go”链接
                default:
                    try
                    {
                        temp = System.Convert.ToInt32(eventArgument);    
                        if ((temp < 1) | (temp > PageCount))
                        {
                            this.ShowMessage("页数超出范围！");
                            return;
                        }
                        else
                        {
                            temp --;
                            CurrentPageIndex = temp;
                            OnGotoPageClick(new DataControl.DataNavigatorClickEventArgs(CurrentPageIndex));
                        }
                    }
                    catch(Exception)
                    {
                        this.ShowMessage("请输入数字！");
                    
                    }                    
                    break;
            }
        }

        [Bindable(false),
        Category("Data"),
        DefaultValue("")]
        public System.Web.UI.WebControls.DataGrid DataGrid
        {
            get 
            { 
                return (DataGrid)_datagrid;
//                return (DataGrid)this.ViewState["NavigatorDataGrid"];
            }
            set 
            {            
                try
                {
                    _datagrid = value; 
//                    this.ViewState["NavigatorDataGrid"] = value;
                    CurrentPageIndex = _datagrid.CurrentPageIndex;
                    PageCount = _datagrid.PageCount;
                    PageSize = _datagrid.PageSize;
                    CurrentPageSize = _datagrid.Items.Count;
                    if (DataGrid.DataSource!=null)
                    {
                        TotalRecord = 0;
                        DataSet dataset = (DataSet)DataGrid.DataSource;
                        if (DataGrid.DataMember != string.Empty)
                            TotalRecord = dataset.Tables[DataGrid.DataMember].Rows.Count;
                        else
                            TotalRecord = dataset.Tables[0].Rows.Count;
                    }    
                }
                catch(Exception ee)
                {
                    ShowMessage(ee.Message);
                }
            }
        }
        
        [Bindable(false),
        Category("Data"),
        DefaultValue("")]
        public System.Data.DataSet DataGridDataSet
        {
            get
            {
                return (DataSet)_dataset;
            }
            set 
            {
                if (value != null)
                {
                
                    _dataset = value; 
                    if(((DataGrid)_datagrid).DataMember != string.Empty)
                        TotalRecord = _dataset.Tables[DataGrid.DataMember].Rows.Count;
                    else
                        TotalRecord = _dataset.Tables[0].Rows.Count;                    
    
                }
            }
        }
        [Bindable(false),
        Category("Appearance"),
        DefaultValue("")]
        public int CurrentPageIndex
        {
            get
            {
                return (int)ViewState["CurrentPageIndex"]; 
            }
            set 
            {
                ViewState["CurrentPageIndex"] = value;
            }
        }

        [Bindable(false),
        Category("Appearance"),
        DefaultValue("")]
        public int PageCount
        {
            get
            {
                return (int)ViewState["PageCount"]; 
            }
            set 
            {
                ViewState["PageCount"] = value;
            }
        }

        [Bindable(false),
        Category("Appearance"),
        DefaultValue("")]
        public int TotalRecord
        {
            get
            {
                return (int)ViewState["TotalRecord"];
            }
            set 
            {
                ViewState["TotalRecord"] = value;
            }
        }

        [Bindable(false),
        Category("Appearance"),
        DefaultValue("")]
        public int PageSize
        {
            get
            {
                return (int)ViewState["PageSize"]; 
            }
            set 
            {
                ViewState["PageSize"] = value;
            }
        }

        public int CurrentPageSize
        {
            get 
            {
                return (int)ViewState["CurrentPageSize"];
            }
            set
            {
                ViewState["CurrentPageSize"] = value;
            }
        }


        [Bindable(true), 
            Category("Appearance"), 
            DefaultValue("")] 
        public string Text 
        {
            get
            {
                return (string)ViewState["Text"];
            }
 
            set
            {
                ViewState["Text"] = value;
            }
        }

        public void DataGridDataBind()
        {
            if (DataGrid != null)            
            {
                DataGrid.EditItemIndex = -1;
                DataGrid.CurrentPageIndex = CurrentPageIndex;
                if (DataGrid.DataMember == string.Empty)
                    DataGrid.DataMember = this.DataGridDataSet.Tables[0].TableName;
                DataGrid.DataBind();                
            }
        }
        /**//// <summary> 
        /// 将此控件呈现给指定的输出参数。
        /// </summary>
        /// <param name="output"> 要写出到的 HTML 编写器 </param>
        protected override void Render(HtmlTextWriter output)
        {
            string script = "<script type=""text/javascript"">";
            script += "function gettext(){ return document.all['GoToTextBox'].value;}";
            script += "</script>"
            
            output.Write(script);
            output.Write("共有"+TotalRecord.ToString()+"记录");
            output.Write("&nbsp;");
            if (CurrentPageIndex == 0)
            {
                output.Write("上一页&nbsp;下一页&nbsp;");
                output.Write("&nbsp;");
            }
            else
            {
                output.Write("<a  href=javascript:"+this.Page.GetPostBackClientEvent(this,"FirstPage")+">上一页</a>");
                output.Write("&nbsp;");
                output.Write("<a  href=javascript:"+this.Page.GetPostBackClientEvent(this,"PreviousPage")+">下一页</a>");
                output.Write("&nbsp;");
            }
            
            if (CurrentPageIndex < PageCount-1)
            {
                output.Write("<a class='NextPgBtn' href=javascript:"+this.Page.GetPostBackClientEvent(this,"NextPage")+"></a>");
                output.Write("&nbsp;");
                output.Write("<a class='LastPgBtn' href=javascript:"+this.Page.GetPostBackClientEvent(this,"LastPage")+"></a>");
                output.Write("&nbsp;");
            }
            else
                output.Write("下一页&nbsp;末页&nbsp;");

            output.Write("&nbsp;&nbsp;转到&nbsp;");
            output.Write("<input");
            if (PageCount == 1)
                output.Write(" disabled = 'disabled' ");
            output.Write(" Type=Text Name=GoToTextBox ");
            int temp = CurrentPageIndex + 1;
            output.Write(" value = "+temp.ToString());
            output.Write(" size = 2>");
            output.Write("/"+PageCount.ToString()+"页");
            output.Write("&nbsp;&nbsp;");
            output.Write("<input Type=Button Name=GoToButton  value = 定位 onclick = javascript:__doPostBack('"+this.ID+"',gettext())>");
            output.Write("&nbsp;&nbsp;");
            output.Write("每页"+CurrentPageSize.ToString()+"/"+PageSize.ToString()+"条记录");
        }

        public  DataGridNavigator()
        {
            CurrentPageIndex = 0;
            PageCount = 0;
            TotalRecord = 0;
            PageSize = 0;
            CurrentPageSize = 0;
            Text = "";
        }
    }
}

但是，每页刷新的时候，DataGrid和DataSet需要重新付值，这个问题写个版本在解决吧，呵呵，这个我做的第一个DotNet控件！