c# - 从后面的 c# 代码创建的多个 AJAX asyncfileupload

Question

我有多个从 C# 背后的代码创建的 asyncfileupload 控件，我不知道如何从我的代码的 UploadedComplete 部分或与此相关的任何实例中引用正确的控件实例。

我在一个页面中使用 20 个异步文件上传，所有这些都在不同的模式弹出控件中，因此当您单击一个按钮时，从每次触发后的代码创建我的所有控件。所以只使用 c# 是绝对必要的。

每个实例创建如下:

AsyncFileUpload afuUploadEvents     = new AsyncFileUpload();
afuUploadEvents.ID                  = "AsyncFileUploadId";
afuUploadEvents.UploadedComplete   += new EventHandler<AsyncFileUploadEventArgs>this.afuUpload_UploadedComplete);
// other settings... blah blah blah... 

这是寻找控件的尝试:

protected void afuUpload_UploadedComplete(object sender, AsyncFileUploadEventArgs e)
{
    // get the file upload control - doesn't work
    AsyncFileUpload oFileUpload = (AsyncFileUpload)sender;
    // Try again - doesn't work
    ContainerElem.FindControl("AsyncFileUploadId");
}

如何获取上传处理程序中发生的特定实例？

~E

Answer 1

protected void AsyncFileUploadComplete(object oSender, AsyncFileUploadEventArgs e)
{
    try
    {   
        AsyncFileUpload oFileUploadControl = GetFileUploadInstance(ContainerId, (AsyncFileUpload)oSender);
    }
    catch (exception ex)
    {
    }
}

private AsyncFileUpload GetFileUploadInstance(Control oContainer, AsyncFileUpload oSender)
{

    // Place all of your popup controls in a global container, look for the sender as a child control
    foreach (Control oControl in oContainer.Controls)
        if (oControl.Controls.Count != 0 && oControl.FindControl("m_afuFileUpload") == oSender)
            return (AsyncFileUpload)oControl;

    return new AsyncFileUpload(); // || throw new Exception("Could not find ASyncFileUpload Instance");
}