如何扩展AsyncFileUpload类？

Question

我正在尝试扩展AsyncFileUploadEventArgs类。下面是我的代码

public class abc : AsyncFileUploadEventArgs
{
    public abc() { }
    public int MyProperty { get; set; }

    public String FileName { get { return fileName; } }
    private string fileName;

    public string FileSize { get { return fileSize; } }
    private string fileSize;

    public AsyncFileUploadState State { get { return State; } }
    private AsyncFileUploadState state;

    public string StatusMessage { get { return statusMessage; } }
    private string statusMessage;

    public abc(AsyncFileUploadState state, string statusMessage, string filename, 
                                                                   string filesize)
    {
        this.fileName = filename;
        this.state = state;
        this.statusMessage = statusMessage;
        this.fileSize = filesize;
    }
}

MetaData of AsyncFileUploadEventArgs类

public class AsyncFileUploadEventArgs : EventArgs
{
    public AsyncFileUploadEventArgs();
    public AsyncFileUploadEventArgs(AsyncFileUploadState state, string statusMessage, string filename, string filesize);

    public string FileName { get; }
    public string FileSize { get; }
    public AsyncFileUploadState State { get; }
    public string StatusMessage { get; }
}

下面是AsyncFileUpload UploadedComplete处理程序

protected void AsyncFileUpload1_UploadedComplete(object sender, abc e)
{
}

下面是AsyncFileUpload的用户控件

<cc1:AsyncFileUpload ID="AsyncFileUpload1" Width="400px" 
    runat="server" OnUploadedComplete="AsyncFileUpload1_UploadedComplete" />

我的动机是-我试图验证AsyncFileUpload1_UploadedComplete处理程序中所选文件的高度和宽度。我这样做服务器端，因为高度和宽度在AsyncFileUploadEventArgs类中不可用。

因此，我正在考虑添加名为Height的新属性，并分配它的值服务器端，并访问它的客户端。

通过扩展类，它给出了下面的错误

没有“AsyncFileUpload1_UploadedComplete”匹配的重载委托'System.EventHandler‘

你能告诉我原因吗？

Answer 1

应该在UploadedComplete事件中使用此参数：

protected void AsyncFileUpload1_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)