ASP.NET – 控制事件不在Repeater内部触发

这是一个荒谬的常见问题,已经耗尽了所有明显的解决方案,我希望SO能为我提供一些输入……我在一个页面内有一个UserControl,其中包含一个转发器,它包含几个导致回发的控件.麻烦的是,转发器内部的所有控件在回发时都不会碰到它们的事件处理程序,但是转发器外部的控件(仍在UC中)可以正确处理.我已经确定我的控件没有被重新生成,因为缺少if(！IsPostBack)并且我验证了Request.Form [“__ EVENTTARGET”]在Page_Load事件中包含正确的控件ID.我试图在一个单独的项目中重现这些症状,并且它可以正常工作.

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="NoteListControl.ascx.cs"
    Inherits="SantekGBS.Web.UserControls.NoteListControl" %>

<asp:UpdatePanel ID="upNotes" runat="server" UpdateMode="Conditional">
    <ContentTemplate>
        <div class="NoteList" id="divNoteList" runat="server">
            <asp:Repeater ID="repNotes" runat="server">
                <HeaderTemplate>
                    <table width="98%" cellpadding="3" cellspacing="0">
                </HeaderTemplate>
                <ItemTemplate>
                    <tr class="repeaterItemRow">
                        <asp:ImageButton ID="ImageButton1" runat="server" ImageUrl="~/Content/images/DeleteIcon.gif"
                            OnClick="ibRemove_Click" CommandArgument='<%# Container.ItemIndex %>' CommandName='<%# Eval("ID") %>'
                            CausesValidation="false" AlternateText="Delete" />
                        <%# Eval("Text") %></td>
                    </tr>
                </ItemTemplate>
                <FooterTemplate>
                    </table>
                </FooterTemplate>
            </asp:Repeater>
            <asp:PlaceHolder ID="phNoNotes" runat="server" Visible="false">
                <div class="statusMesssage">
                    No notes to display.
                </div>
            </asp:PlaceHolder>
        </div>
    </ContentTemplate>
</asp:UpdatePanel>

public partial class NoteListControl : UserControl
{
    [Ninject.Inject]
    public IUserManager UserManager { get; set; }

    protected List<Note> Notes
    {
        get
        {
            if (ViewState["NoteList"] != null)
                return (List<Note>)ViewState["NoteList"];
            return null;
        }
        set { ViewState["NoteList"] = value; }
    }

    public event EventHandler<NoteEventArgs> NoteAdded;
    public event EventHandler<NoteEventArgs> NoteDeleted;
    public event EventHandler<NoteEventArgs> NoteChanged;

    protected void Page_Load(object sender,EventArgs e)
    {
        if (!IsPostBack)
        {
            UtilityManager.FillPriorityListControl(ddlPriority,false);
        }
    }

    protected void ibRemove_Click(object sender,ImageClickEventArgs e)
    {
        System.Diagnostics.Debug.WriteLine("ibRemove POSTBACK"); // This is NEVER hit
    }

    public void Fill(List<Note> notes)
    {
        Notes = notes;
        RefreshRepeater();
    }

    private void RefreshRepeater()
    {
        if (Notes != null && Notes.Any())
        {
            var sorted = Notes.OrderByDescending(n => n.Timestamp);
            Notes = new List<Note>();
            Notes.AddRange(sorted);
            repNotes.Visible = true;
            phNoNotes.Visible = false;
            repNotes.DataSource = Notes;
            repNotes.DataBind();
        }
        else
        {
            repNotes.Visible = false;
            phNoNotes.Visible = true;
        }
    }
}

public class NoteEventArgs : EventArgs
{
    public Note Note { get; set; }
    public NoteEventArgs()
    { }
    public NoteEventArgs(Note note)
    {
        this.Note = note;
    }
}

代码故意丢失功能,所以只是忽略这个事实.

解决方法

如果是这样,如果你的页面在回发上调用控件的Fill方法,那就可以解释它.

这些经典的ASP.NET头发撕裂问题在这些帖子中有解释：A Stumper of an ASP.NET Question和A Stumper of an ASP.NET Question: SOLVED!

解释有点令人费解,但其关键在于Repeater.DataBind干扰了ASP.NET确定哪个转发器按钮导致回发的能力.

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