IPostBackDataHandler？
我想要实现一个自定义控件，不继承自某一个带有回送的webcontrol,同时有自己的属性:SelectID。
页面调用
<MyNameSpace:MyControl runat= "server " ID= "MyControl1 " SkinName= "Skin1.ascx " SelectID= '12 '> </MyNameSpace:MyControl>
正常
如果将控件放在repeater内
<asp:Repeater ID= "DefaultList " runat= "server " >
<ItemTemplate>
<MyNameSpace:MyControl runat= "server " ID= "MyControl1 " SkinName= "Skin1.ascx " SelectID= ' <%# DataBinder.Eval(Container.DataItem, "SelectID ") %> '> </MyNameSpace:MyControl> </ItemTemplate>
</asp:Repeater>
就不正常，SelectID得不到值，看有大大说和IPostBackDataHandler有关，是否确实？如果确实，该如何实现这个回送接口。
[解决办法]
[Bindable(true)]public string SelectedID{ get {}set{}}
[解决办法]
楼上的Bindable特性是把SelectID设成可绑定的,这样才能在ItemTemplate里用Eval绑定,
[解决办法]
微软的例子
---------------------------------------------
using System;
using System.Web;
using System.Web.UI;
using System.Collections;
using System.Collections.Specialized;
namespace CustomWebFormsControls {
[System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name= "FullTrust ")]
public class MyTextBox: Control, IPostBackDataHandler {
public String Text {
get {
return (String) ViewState[ "Text "];
}
set {
ViewState[ "Text "] = value;
}
}
public event EventHandler TextChanged;
public virtual bool LoadPostData(string postDataKey,
NameValueCollection postCollection) {
String presentValue = Text;
String postedValue = postCollection[postDataKey];
if (presentValue == null || !presentValue.Equals(postedValue)) {
Text = postedValue;
return true;
}
return false;
}
public virtual void RaisePostDataChangedEvent() {
OnTextChanged(EventArgs.Empty);
}
protected virtual void OnTextChanged(EventArgs e) {
if (TextChanged != null)
TextChanged(this,e);
}
protected override void Render(HtmlTextWriter output) {
output.Write( " <INPUT type= text name = "+this.UniqueID
+ " value = " + this.Text + " > ");
}
}
}
[解决办法]
应该是可以的.1.检查数据库中有没有值.2.是不是已经给值了,但没有看到?
