asp.net中让Repeater和GridView支持DataPager分页
导读：收集整理的这篇文章主要介绍了asp.net中让Repeater和GridView支持DataPager分页，觉得挺不错的，现在分享给大家，也给大家做个参考。 改造办法是自己写一个控件，让...
收集整理的这篇文章主要介绍了asp.net中让Repeater和GridView支持DataPager分页，觉得挺不错的，现在分享给大家，也给大家做个参考。 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 name="savedstate"> /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 name="startRowIndex"> startRowIndex/param>
/// param name="maximumRows"> maximumRows/param>
/// param name="databind"> databind/param>
public void SetPageProperties(int startRowIndex, int maximumRows, bool databind)
{
ViewState["StartRowIndex"] = startRowIndex;
ViewState["MaximumRows"] = maximumRows;
if (TotalRows > -1)
{
if (Total@R_126_659@Available != 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 name="writer"> /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.EventHandlerPageEventArgs> TotalRowCountAvailable;
/// summary>
/// Event when repeater gets the data on postback
/// /summary>
public event System.EventHandlerPageEventArgs> 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:
WYJ:DataPagerRepeater ID="rptLeaveword" runat="server" PersistentDataSource="true">
ItemTemplate>
div class="leavewordentry">
div class="datebox">
div class="time">
%# ((GeekStudio.ORM.Model.Leaveword)Container.DataItem).Posttime.ToString("HH:mm") %> /div>
div class="day">
%# ((GeekStudio.ORM.Model.Leaveword)Container.DataItem).Posttime.ToString("dd") %>
/div>
div class="month">
%# ((GeekStudio.ORM.Model.Leaveword)Container.DataItem).Posttime.ToString("MMM", new CultureInfo("en-US")).ToUpper() %> %# ((GeekStudio.ORM.Model.Leaveword)Container.DataItem).Posttime.ToString(" yyyy") %> /div>
/div>
div class="contentbox">
h2 class="username">
a id="%# GeekStudio.COMmon.IdEncryptor.EncodeId(((GeekStudio.ORM.Model.Leaveword)Container.DataItem).Id) %> "
name="%# GeekStudio.Common.IdEncryptor.EncodeId(((GeekStudio.ORM.Model.Leaveword)Container.DataItem).Id) %> ">
%# ((GeekStudio.ORM.Model.Leaveword)Container.DataItem).Username %> /a> /h2>
div class="lvwordcontent">
%# ((GeekStudio.ORM.Model.Leaveword)Container.DataItem).Content %>
/div>
/div>
/div>
/ItemTemplate>
/WYJ:DataPagerRepeater>
之后添加.NET自带的DataPager，并自定义一些分页样式
复制代码 代码如下:
div class="pager">
div class="fr">
共%=Math.Ceiling((double)DataPager1.TotalRowCount / DataPager1.PageSize)%> 页，%=DataPager1.TotalRowCount%> 条记录，每页显示
asp:LinkButton ID="lnkBTn10" CssClass="currentpagesize" runat="server" OnClick="lnkbtn10_Click"> 10/asp:LinkButton>
asp:LinkButton ID="lnkbtn20" runat="server" OnClick="lnkbtn20_Click"> 20/asp:LinkButton>
asp:LinkButton ID="lnkbtn30" runat="server" OnClick="lnkbtn30_Click"> 30/asp:LinkButton>
/div>
asp:DataPager ID="DataPager1" PagedControlID="rptLeaveword" runat="server">
Fields>
asp:NextPreviousPagerField ShowFirstPageButton="True" ShowNextPageButton="False"
ShowPreviousPageButton="False" FirstPageText="首页" />
asp:NextPreviousPagerField ShowNextPageButton="False" ButtonType="Image" PreviousPageImageUrl="~/Images/icons/pagerprevious.png" />
asp:NumericPagerField CurrentPageLabelCssClass="current" />
asp:NextPreviousPagerField ShowPreviousPageButton="False" ButtonType="Image" NextPageImageUrl="~/Images/icons/pagernext.png" />
asp:NextPreviousPagerField ShowLastPageButton="True" ShowNextPageButton="False"
ShowPreviousPageButton="False" LastPageText="尾页" />
/Fields>
/asp:DataPager>
/div>
后台代码：
分页部分不需要代码。下面发的代码是切换每页显示数量的：
复制代码 代码如下:
protected void lnkbtn10_Click(object sender, EventArgs e)
{
DataPager1.PageSize = 10;
lnkbtn10.CssClass = "currentpagesize";
lnkbtn20.CssClass = "";
lnkbtn30.CssClass = "";
}
protected void lnkbtn20_Click(object sender, EventArgs e)
{
DataPager1.PageSize = 20;
lnkbtn20.CssClass = "currentpagesize";
lnkbtn10.CssClass = "";
lnkbtn30.CssClass = "";
}
protected void lnkbtn30_Click(object sender, EventArgs e)
{
DataPager1.PageSize = 30;
lnkbtn30.CssClass = "currentpagesize";
lnkbtn10.CssClass = "";
lnkbtn20.CssClass = "";
}
二、自定义GridView
复制代码 代码如下:
using System;
using System.Collections;
using System.Web.UI.WebControls;
namespace WYJ.Web.Controls
{
/// summary>
/// DataPagerGridView is a custom control that implements GrieView and IPageableItemContainer
/// /summary>
public class DataPagerGridView : GridView, IPageableItemContainer
{
public DataPagerGridView()
: base()
{
PagerSettings.Visible = false;
}
/// summary>
/// TotalRowCountAvailable event key
/// /summary>
private static readonly object EventTotalRowCountAvailable = new object();
/// summary>
/// Call base control's CreateChildControls method and determine the number of rows in the source
/// then fire off the event with the derived data and then we return the original result.
/// /summary>
/// param name="dataSource"> /param>
/// param name="dataBinding"> /param>
/// returns> /returns>
protected override int CreateChildControls(IEnumerable dataSource, bool dataBinding)
{
int rows = base.CreateChildControls(dataSource, dataBinding);
// if the paging feature is enabled, determine the total number of rows in the datasource
if (this.AllowPaging)
{
// if we are databinding, use the number of rows that were created, otherwise cast the datasource to an Collection and use that as the count
int totalRowCount = dataBinding ? rows : ((ICollection)dataSource).Count;
// raise the row count available event
IPageableItemContainer pageableItemContainer = this as IPageableItemContainer;
this.OnTotalRowCountAvailable(new PageEventArgs(pageableItemContainer.StartRowIndex, pageableItemContainer.MaximumRows, totalRowCount));
// make sure the top and bottom pager rows are not visible
if (this.TopPagerRow != null)
this.TopPagerRow.Visible = false;
if (this.BottomPagerRow != null)
this.BottomPagerRow.Visible = false;
}
return rows;
}
/// summary>
/// Set the control with appropriate parameters and bind to right chunk of data.
/// /summary>
/// param name="startRowIndex"> /param>
/// param name="maximumRows"> /param>
/// param name="databind"> /param>
void IPageableItemContainer.SetPageProperties(int startRowIndex, int maximumRows, bool databind)
{
int newPageIndex = (startRowIndex / maximumRows);
this.PageSize = maximumRows;
if (this.PageIndex != newPageIndex)
{
bool isCanceled = false;
if (databind)
{
// create the event arguments and raise the event
GridViewPageEventArgs args = new GridViewPageEventArgs(newPageIndex);
this.OnPageIndexChanging(args);
isCanceled = args.Cancel;
newPageIndex = args.NewPageIndex;
}
// if the event wasn't cancelled change the paging values
if (!isCanceled)
{
this.PageIndex = newPageIndex;
if (databind)
this.OnPageIndexChanged(EventArgs.Empty);
}
if (databind)
this.RequiresDataBinding = true;
}
}
/// summary>
/// IPageableItemContainer's StartRowIndex = PageSize * PageIndex properties
/// /summary>
int IPageableItemContainer.StartRowIndex
{
get { return this.PageSize * this.PageIndex; }
}
/// summary>
/// IPageableItemContainer's MaximumRows = PageSize property
/// /summary>
int IPageableItemContainer.MaximumRows
{
get { return this.PageSize; }
}
/// summary>
///
/// /summary>
event EventHandlerPageEventArgs> IPageableItemContainer.TotalRowCountAvailable
{
add { base.Events.AddHandler(DataPagerGridView.EventTotalRowCountAvailable, value); }
remove { base.Events.RemoveHandler(DataPagerGridView.EventTotalRowCountAvailable, value); }
}
/// summary>
///
/// /summary>
/// param name="e"> /param>
protected virtual void OnTotalRowCountAvailable(PageEventArgs e)
{
EventHandlerPageEventArgs> handler = (EventHandlerPageEventArgs> )base.Events[DataPagerGridView.EventTotalRowCountAvailable];
if (handler != null)
{
handler(this, e);
}
}
}
}
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