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(" ");
if (CurrentPageIndex == 0)
{
output.Write("上一页 下一页 ");
output.Write(" ");
}
else
{
output.Write("<a href=javascript:"+this.Page.GetPostBackClientEvent(this,"FirstPage")+">上一页</a>");
output.Write(" ");
output.Write("<a href=javascript:"+this.Page.GetPostBackClientEvent(this,"PreviousPage")+">下一页</a>");
output.Write(" ");
}
if (CurrentPageIndex < PageCount-1)
{
output.Write("<a class='NextPgBtn' href=javascript:"+this.Page.GetPostBackClientEvent(this,"NextPage")+"></a>");
output.Write(" ");
output.Write("<a class='LastPgBtn' href=javascript:"+this.Page.GetPostBackClientEvent(this,"LastPage")+"></a>");
output.Write(" ");
}
else
output.Write("下一页 末页 ");
output.Write(" 转到 ");
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(" ");
output.Write("<input Type=Button Name=GoToButton value = 定位 onclick = javascript:__doPostBack('"+this.ID+"',gettext())>");
output.Write(" ");
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！
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(" "); if (CurrentPageIndex == 0) { output.Write("上一页 下一页 "); output.Write(" "); } else { output.Write("<a href=javascript:"+this.Page.GetPostBackClientEvent(this,"FirstPage")+">上一页</a>"); output.Write(" "); output.Write("<a href=javascript:"+this.Page.GetPostBackClientEvent(this,"PreviousPage")+">下一页</a>"); output.Write(" "); } if (CurrentPageIndex < PageCount-1) { output.Write("<a class='NextPgBtn' href=javascript:"+this.Page.GetPostBackClientEvent(this,"NextPage")+"></a>"); output.Write(" "); output.Write("<a class='LastPgBtn' href=javascript:"+this.Page.GetPostBackClientEvent(this,"LastPage")+"></a>"); output.Write(" "); } else output.Write("下一页 末页 "); output.Write(" 转到 "); 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(" "); output.Write("<input Type=Button Name=GoToButton value = 定位 onclick = javascript:__doPostBack('"+this.ID+"',gettext())>"); output.Write(" "); output.Write("每页"+CurrentPageSize.ToString()+"/"+PageSize.ToString()+"条记录"); } public DataGridNavigator() { CurrentPageIndex = 0; PageCount = 0; TotalRecord = 0; PageSize = 0; CurrentPageSize = 0; Text = ""; } }} 
