ASP.NET - 触发asyncpostback与里面的LinkBut​​ton的ListView这是里面的UpdatePanel [英] ASP.NET - Triggering asyncpostback with LinkButton inside ListView which is inside UpdatePanel

问题描述

好吧我的第一篇文章，我希望标题是有道理的。

Ok my first post and i hope the title makes sense.

我有一个UpdatePanel，和里面居住与一个按钮FileUpload控件来触发上传。下面，我有这是在隐藏文件databinded与上传文件的列表一个ListView。在UpdatePanel有一个PostBackTrigger指着上传按钮。

I have an updatepanel, and inside it resides a fileupload control with a button to trigger an upload. Beneath that i have a ListView which is databinded in the behind file with a list of files that is uploaded. The updatepanel has a "PostBackTrigger" pointed to the upload button.

所有这些工作只是因为它应该。对于列出的每个项目，有它删除该特定文件一个LinkBut​​ton。这也适用，因为它应该，但这里的东西：
它不会触发回传和Web搜索更不用说计算器的答案后，我试过无数方法。我尝试了很多，但没有真正发生，即使是什么样子的最佳解决方案的实施。

All of this works just as it should. For each item that is listed, there is a linkbutton which deletes that specific file. That also works as it should BUT here is the thing: It does not trigger a postback and i tried numerous methods after searching the web and not to mention stackoverflow for answers. I tried a lot but nothing really happens even if what looks like the best solution is implemented.

在ASCX文件（是其如果该事项一个用户控件）：

The ascx file (yes its a usercontrol if that matters):

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
    <asp:Label ID="LabelUploadFile" runat="server" Text="Upload fil:"></asp:Label>
    <br />
    <asp:FileUpload ID="FileUploadDocument" runat="server" />
    <br />
    <asp:DropDownList ID="DropDownListDocumentType" runat="server"></asp:DropDownList>
    <br />
    <asp:Button ID="ButtonUploadFile" runat="server" Text="Upload fil" CssClass="nice small radius action button" onclick="ButtonUploadFile_Click" />
    <br />
    <br />
    <br />
    <asp:ListView ID="ListViewDocuments" runat="server" OnItemCommand="ListViewDocuments_ItemCommand">
        <LayoutTemplate>
            <table border="0" cellpadding="1">
                <tr>
                    <th align="left">Type</th>
                    <th align="left">Dokument</th>
                    <th></th>
                </tr>
                <tr id="itemPlaceholder" runat="server"></tr>
            </table>
        </LayoutTemplate>
        <ItemTemplate>
            <tr>
                <td><asp:Label runat="server" ID="lblName"><%#Eval("Type") %></asp:Label></td>
                <td><asp:Label runat="server" ID="lblType"><%#Eval("Dokument") %></asp:Label></td>
                <td><asp:LinkButton ID="DeleteButton" OnClientClick="return confirm('Slet dokument?');" CommandName="Delete" CommandArgument='<%# Eval("id")%>' runat="server" Text="Slet"></asp:LinkButton></td>
            </tr>
        </ItemTemplate>
        <EmptyDataTemplate>
            <tr>
                <td>&nbsp;</td>
                <td>Du har ikke uploadet filer endnu.</td>
                <td>&nbsp;</td>
            </tr>
        </EmptyDataTemplate>
    </asp:ListView>
</ContentTemplate>
<Triggers>
    <asp:PostBackTrigger ControlID="ButtonUploadFile" />
    <asp:AsyncPostBackTrigger ControlID="ListViewDocuments" EventName="ItemCommand" />
</Triggers>

（注意asyncpostbacktrigger仅仅是另一种解决方案我尝试了，我也不会被删除。另外一个ScriptManager是present，它只是不会再$ P $上面code psented）

(Note the asyncpostbacktrigger is just another solution i tried out which i have not removed. Also a scriptmanager is present, it is just not represented in the above code)

从隐藏文件的ListViewDocuments_ItemCommand：

The ListViewDocuments_ItemCommand from the behind file:

protected void ListViewDocuments_ItemCommand(object sender, ListViewCommandEventArgs e)
    {
        if (e.CommandName == "Delete")
        {
            //Send the file's ID to the data layer for deletion
            _talentDataAccess.DeleteTalentFileByFileId(Convert.ToInt32(e.CommandArgument));
            //Rebind the listveiw with a new list of files.
            _fillFileList();
        }
    }

所以，就像我说的，在技术上一切正常，但在短期LinkBut​​ton的不刷新UpdatePanel的。

So like i said, technically everything works, but in short the linkbutton does not refresh the updatepanel.

如果有其他code段有任何疑问或需要，我会及时respondt。

If there is any questions or need for other code snippets, i will respondt promptly.

感谢您提前。

推荐答案

这有可能是在的CommandName =删除是提高事件 ItemDeleted 和 ItemDeleting ，而不是 ItemCommand 。虽然我不得不说，如果是这样的话那么我期望的页面崩溃由于缺乏这些事件（见的 MSDN 了解详细信息）。

It's possible that the CommandName="Delete" is raising the events ItemDeleted and ItemDeleting and not ItemCommand. Although I have to say if this was the case then I would expect the page to crash due to the absence of those events (see MSDN for more details).

这是说，当我使用了删除（或编辑）字，因为我已经找到了问题的命令。所以我会尝试以下

That said when I have used the Delete (or Edit) word as a command I've found problems. So I would try the following

1. 更改命令的名称类似的CommandName =ItemDelete。请问 ListViewDocuments_ItemCommand 火现在


2. 此外 - 看它是否是造成问题，我会暂时删除它，直到你确信该项命令触发，只要你想更新面板。

1. Change the name of the command to something like CommandName="ItemDelete". Does the ListViewDocuments_ItemCommand fire now
2. Also - to see if it is the update panel causing problems I would temporarily remove it until you are convinced that the item command fires as you want.

希望它可以帮助一些

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