改造办法是自己写一个控件，让它继承GridView或Repeater，并实现IPageableItemContainer 接口。下面要发的是国外某高手写的代码，测试有效。具体使用的时候，要建一个类库项目，把代码编译成dll后，就可以添加到VS的工具箱里了！
一、自定义Repeater
复制代码 代码如下:
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WYJ.Web.Controls
{
/// <summary>
/// Repeater with support for DataPager
/// </summary>
[ToolboxData("<{0}:DataPagerRepeater runat=server PersistentDataSource=true></{0}:DataPagerRepeater>")]
public class DataPagerRepeater : Repeater, System.Web.UI.WebControls.IPageableItemContainer, INamingContainer
{
/// <summary>
/// Number of rows to show
/// </summary>
public int MaximumRows { get { return ViewState["MaximumRows"] != null ? (int)ViewState["MaximumRows"] : -1; } }
/// <summary>
/// First row to show
/// </summary>
public int StartRowIndex { get { return ViewState["StartRowIndex"] != null ? (int)ViewState["StartRowIndex"] : -1; } }
/// <summary>
/// Total rows. When PagingInDataSource is set to true you must get the total records from the datasource (without paging) at the FetchingData event
/// When PagingInDataSource is set to true you also need to set this when you load the data the first time.
/// </summary>
public int TotalRows { get { return ViewState["TotalRows"] != null ? (int)ViewState["TotalRows"] : -1; } set { ViewState["TotalRows"] = value; } }
/// <summary>
/// If repeater should store data source in view state. If false you need to get and bind data at post back. When using a connected data source this is handled by the data source.
/// </summary>
public bool PersistentDataSource
{
get { return ViewState["PersistentDataSource"] != null ? (bool)ViewState["PersistentDataSource"] : true; }
set { ViewState["PersistentDataSource"] = value; }
}
/// <summary>
/// Set to true if you want to handle paging in the data source.
/// Ex if you are selecting data from the database and only select the current rows
/// you must set this property to true and get and rebind data at the FetchingData event.
/// If this is true you must also set the TotalRecords property at the FetchingData event.
/// </summary>
/// <seealso cref="FetchingData"/>
/// <seealso cref="TotalRows"/>
public bool PagingInDataSource
{
get { return ViewState["PageingInDataSource"] != null ? (bool)ViewState["PageingInDataSource"] : false; }
set { ViewState["PageingInDataSource"] = value; }
}
/// <summary>
/// Checks if you need to rebind data source at postback
/// </summary>
public bool NeedsDataSource
{
get
{
if (PagingInDataSource)
return true;
if (IsBoundUsingDataSourceID == false && !Page.IsPostBack)
return true;
if (IsBoundUsingDataSourceID == false && PersistentDataSource == false && Page.IsPostBack)
return true;
else
return false;
}
}
/// <summary>
/// Loading ViewState
/// </summary>
/// <param></param>
protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
//if (Page.IsPostBack)
//{
// if (!IsBoundUsingDataSourceID && PersistentDataSource && ViewState["DataSource"] != null)
// {
// this.DataSource = ViewState["DataSource"];
// this.DataBind(true);
// }
// if (IsBoundUsingDataSourceID)
// {
// this.DataBind();
// }
//}
}
protected override void OnLoad(System.EventArgs e)
{
if (Page.IsPostBack)
{
if (NeedsDataSource && FetchingData != null)
{
if (PagingInDataSource)
{
SetPageProperties(StartRowIndex, MaximumRows, true);
}
FetchingData(this, null);
}
if (!IsBoundUsingDataSourceID && PersistentDataSource && ViewState["DataSource"] != null)
{
this.DataSource = ViewState["DataSource"];
this.DataBind();
}
if (IsBoundUsingDataSourceID)
{
this.DataBind();
}
}
base.OnLoad(e);
}
/// <summary>
/// Method used by pager to set totalrecords
/// </summary>
/// <param>startRowIndex</param>
/// <param>maximumRows</param>
/// <param>databind</param>
public void SetPageProperties(int startRowIndex, int maximumRows, bool databind)
{
ViewState["StartRowIndex"] = startRowIndex;
ViewState["MaximumRows"] = maximumRows;
if (TotalRows > -1)
{
if (TotalRowCountAvailable != null)
{
TotalRowCountAvailable(this, new PageEventArgs((int)ViewState["StartRowIndex"], (int)ViewState["MaximumRows"], TotalRows));
}
}
}
/// <summary>
/// OnDataPropertyChanged
/// </summary>
protected override void OnDataPropertyChanged()
{
if (MaximumRows != -1 || IsBoundUsingDataSourceID)
{
this.RequiresDataBinding = true;
}
base.OnDataPropertyChanged();
}
/// <summary>
/// Renders only current items selected by pager
/// </summary>
/// <param></param>
protected override void RenderChildren(HtmlTextWriter writer)
{
if (!PagingInDataSource && MaximumRows != -1)
{
foreach (RepeaterItem item in this.Items)
{
if (item.ItemType == ListItemType.Item || item.ItemType == ListItemType.AlternatingItem)
{
item.Visible = false;
if (item.ItemIndex >= (int)ViewState["StartRowIndex"] && item.ItemIndex < ((int)ViewState["StartRowIndex"] + (int)ViewState["MaximumRows"]))
{
item.Visible = true;
}
}
else
{
item.Visible = true;
}
}
}
base.RenderChildren(writer);
}
/// <summary>
/// Get Data
/// </summary>
/// <returns></returns>
protected override System.Collections.IEnumerable GetData()
{
System.Collections.IEnumerable dataObjects = base.GetData();
if (dataObjects == null && this.DataSource != null)
{
if (this.DataSource is System.Collections.IEnumerable)
dataObjects = (System.Collections.IEnumerable)this.DataSource;
else
dataObjects = ((System.ComponentModel.IListSource)this.DataSource).GetList();
}
if (!PagingInDataSource && MaximumRows != -1 && dataObjects != null)
{
int i = -1;
if (dataObjects != null)
{
i = 0;
foreach (object o in dataObjects)
{
i++;
}
}
ViewState["TotalRows"] = i;
if (!IsBoundUsingDataSourceID && PersistentDataSource)
ViewState["DataSource"] = this.DataSource;
SetPageProperties(StartRowIndex, MaximumRows, true);
}
if (PagingInDataSource && !Page.IsPostBack)
{
SetPageProperties(StartRowIndex, MaximumRows, true);
}
return dataObjects;
}
/// <summary>
/// Event when pager/repeater have counted total rows
/// </summary>
public event System.EventHandler<PageEventArgs> TotalRowCountAvailable;
/// <summary>
/// Event when repeater gets the data on postback
/// </summary>
public event System.EventHandler<PageEventArgs> FetchingData;
}
}
ASPX页面要做的事情（以我网站的留言板为例）：
首先得把标签注册进来
复制代码 代码如下:
<%@ Register Assembly="WYJ.Web.Controls" Namespace="WYJ.Web.Controls" TagPrefix="WYJ" %>
然后添加我们的Repeater
复制代码 代码如下: