从c#代码隐藏创建多个AJAX异步文件上载

我有多个asyncfileupload控件是从C#后面的代码创建的，我不知道如何从代码的UploadedComplete部分引用正确的控件实例，或者引用任何实例

我在一个页面中使用了20个异步文件上传，都在不同的模式弹出控件中，所以当你点击一个按钮时，我会从每个火后面的代码创建所有控件。因此，只使用c#是绝对必要的

每个实例的创建如下所示：

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

如何获取上载处理程序中发生的特定实例

~E

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");
}

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");
}