所以...我有一个聪明的想法，我会创建自己的 Repeater 控件，通过继承 Repeater 并扩展它的功能来实现分页和排序。我找到了一些关于如何解决这个问题的信息和点点滴滴，一切似乎都很好......
我创建了一个 WebControlLibrary 来存放我的自定义控件。除了丰富的转发器，我还创建了一个复合控件，它可以充当“分页栏”，具有前进、后退和页面选择。我的寻呼栏 100% 自己工作，当用户与之交互时正确触发分页更改事件。丰富的转发器数据绑定没有问题，但是当数据绑定触发时（当我调用 base.databind() 时），控件集合被清除并且我的寻呼栏被移除。这搞砸了寻呼栏的视图状态，使它们无法正确触发事件或维持其状态。
我尝试在 base.databind() 触发后将控件添加回集合，但这并不能解决问题。我开始得到非常奇怪的结果，包括更改控制树层次结构的问题（通过添加 [ViewStateModeById] 解决）。
在我回到绘图板并创建第二个复合控件之前，它包含一个中继器和寻呼栏（这样中继器不负责寻呼栏的视图状态），有没有关于如何解决问题的想法？
为了共享和共享的利益，转发器本身的代码如下，分页栏并不重要，因为问题实际上是维护任何其他子控件的状态。（原谅一些代码的粗糙......它仍在进行中）
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Text;
using System.Data;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
[ViewStateModeById]
public class SortablePagedRepeater : Repeater, INamingContainer {
private SuperRepeaterPagerBar topBar = new SuperRepeaterPagerBar();
private SuperRepeaterPagerBar btmBar = new SuperRepeaterPagerBar();
protected override void OnInit(EventArgs e) {
Page.RegisterRequiresControlState(this);
InitializeControls();
base.OnInit(e);
EnsureChildControls();
}
protected void InitializeControls() {
topBar.ID = this.ID + "__topPagerBar";
topBar.NumberOfPages = this._currentProperties.numOfPages;
topBar.CurrentPage = this.CurrentPageNumber;
topBar.PageChanged +=
new SuperRepeaterPagerBar.PageChangedEventHandler(PageChanged);
btmBar.ID = this.ID + "__btmPagerBar";
btmBar.NumberOfPages = this._currentProperties.numOfPages;
btmBar.CurrentPage = this.CurrentPageNumber;
btmBar.PageChanged +=
new SuperRepeaterPagerBar.PageChangedEventHandler(PageChanged);
}
protected override void CreateChildControls() {
EnsureDataBound();
this.Controls.Add(topBar);
this.Controls.Add(btmBar);
//base.CreateChildControls();
}
private void PageChanged(object sender, int newPage) {
this.CurrentPageNumber = newPage;
}
public override void DataBind() {
//pageDataSource();
//DataBind removes all controls from control collection...
base.DataBind();
Controls.Add(topBar);
Controls.Add(btmBar);
}
private void pageDataSource() {
//Create paged data source
PagedDataSource pds = new PagedDataSource();
pds.PageSize = this.ItemsPerPage;
pds.AllowPaging = true;
// first get a PagedDataSource going and perform sort if possible...
if (base.DataSource is System.Collections.IEnumerable) {
pds.DataSource = (System.Collections.IEnumerable)base.DataSource;
} else if (base.DataSource is System.Data.DataView) {
DataView data = (DataView)DataSource;
if (this.SortBy != null && data.Table.Columns.Contains(this.SortBy)) {
data.Sort = this.SortBy;
}
pds.DataSource = data.Table.Rows;
} else if (base.DataSource is System.Data.DataTable) {
DataTable data = (DataTable)DataSource;
if (this.SortBy != null && data.Columns.Contains(this.SortBy)) {
data.DefaultView.Sort = this.SortBy;
}
pds.DataSource = data.DefaultView;
} else if (base.DataSource is System.Data.DataSet) {
DataSet data = (DataSet)DataSource;
if (base.DataMember != null && data.Tables.Contains(base.DataMember)) {
if (this.SortBy != null && data.Tables[base.DataMember].Columns.Contains(this.SortBy)) {
data.Tables[base.DataMember].DefaultView.Sort = this.SortBy;
}
pds.DataSource = data.Tables[base.DataMember].DefaultView;
} else if (data.Tables.Count > 0) {
if (this.SortBy != null && data.Tables[0].Columns.Contains(this.SortBy)) {
data.Tables[0].DefaultView.Sort = this.SortBy;
}
pds.DataSource = data.Tables[0].DefaultView;
} else {
throw new Exception("DataSet doesn't have any tables.");
}
} else if (base.DataSource == null) {
// don't do anything?
} else {
throw new Exception("DataSource must be of type System.Collections.IEnumerable. The DataSource you provided is of type " + base.DataSource.GetType().ToString());
}
if (pds != null && base.DataSource != null) {
//Make sure that the page doesn't exceed the maximum number of pages
//available
if (this.CurrentPageNumber >= pds.PageCount) {
this.CurrentPageNumber = pds.PageCount - 1;
}
//Set up paging values...
btmBar.CurrentPage = topBar.CurrentPage = pds.CurrentPageIndex = this.CurrentPageNumber;
this._currentProperties.numOfPages = btmBar.NumberOfPages = topBar.NumberOfPages = pds.PageCount;
base.DataSource = pds;
}
}
public override object DataSource {
get {
return base.DataSource;
}
set {
//init(); //reset paging/sorting values since we've potentially changed data sources.
base.DataSource = value;
pageDataSource();
}
}
protected override void Render(HtmlTextWriter writer) {
topBar.RenderControl(writer);
base.Render(writer);
btmBar.RenderControl(writer);
}
[Serializable]
protected struct CurrentProperties {
public int pageNum;
public int itemsPerPage;
public int numOfPages;
public string sortBy;
public bool sortDir;
}
protected CurrentProperties _currentProperties = new CurrentProperties();
protected override object SaveControlState() {
return this._currentProperties;
}
protected override void LoadControlState(object savedState) {
this._currentProperties = (CurrentProperties)savedState;
}
[Category("Status")]
[Browsable(true)]
[NotifyParentProperty(true)]
[DefaultValue("")]
[Localizable(false)]
public string SortBy {
get { return this._currentProperties.sortBy; }
set {
//If sorting by the same column, swap the sort direction.
if (this._currentProperties.sortBy == value) {
this.SortAscending = !this.SortAscending;
} else {
this.SortAscending = true;
}
this._currentProperties.sortBy = value;
}
}
[Category("Status")]
[Browsable(true)]
[NotifyParentProperty(true)]
[DefaultValue(true)]
[Localizable(false)]
public bool SortAscending {
get { return this._currentProperties.sortDir; }
set { this._currentProperties.sortDir = value; }
}
[Category("Status")]
[Browsable(true)]
[NotifyParentProperty(true)]
[DefaultValue(25)]
[Localizable(false)]
public int ItemsPerPage {
get { return this._currentProperties.itemsPerPage; }
set { this._currentProperties.itemsPerPage = value; }
}
[Category("Status")]
[Browsable(true)]
[NotifyParentProperty(true)]
[DefaultValue(1)]
[Localizable(false)]
public int CurrentPageNumber {
get { return this._currentProperties.pageNum; }
set {
this._currentProperties.pageNum = value;
pageDataSource();
}
}
}