C# 在Excel加载项中的Excel启动时运行web请求

我有一个Excel插件，当Excel启动时，它将访问一个web服务GET，这是一个简单的web服务请求，应该立即完成，并说：类似https://mywebservice.com&application=myapp&user=currentuser,结果是一个简短的Excel加载项事件，您使用哪个事件调用此下载方法？我正在使用Excel DNA对我的加载项进行编码。这不是Excel事件。它处于自动打开状态。它在Excel启动时运行。这是在不同的系统/登录名上发生的，还是在同一个系统+登录名上发生的？那么我怀疑是网络问题还是加载项代码中存在争用情况。。。你有详细的日志吗？

        private static int DownloadInfoFromServer(string entUrl, string localFilename)
    {
        // Function will return the number of bytes processed
        // to the caller. Initialize to 0 here.
        int bytesProcessed = 0;

        // Assign values to these objects here so that they can
        // be referenced in the finally block
        Stream remoteStream = null;
        Stream localStream = null;
        HttpWebResponse response = null;
        HttpWebRequest request;
        // Use a try/catch/finally block as both the WebRequest and Stream
        // classes throw exceptions upon error
        try
        {
            //clear out local file every time no matter request fails or not
            localStream = File.Create(localFilename);

            request = ServiceBase.GetHttpWebRequestWithProxyForEnt(entUrl);
            response = (HttpWebResponse)request.GetResponse();

            // Once the WebResponse object has been retrieved,
            // get the stream object associated with the response's data
            remoteStream = response.GetResponseStream();

            if (remoteStream != null)
            {
                // Allocate a 1k buffer
                var buffer = new byte[1024];
                int bytesRead;

                // Simple do/while loop to read from stream until
                // no bytes are returned
                do
                {
                    // Read data (up to 1k) from the stream
                    bytesRead = remoteStream.Read(buffer, 0, buffer.Length);

                    // Write the data to the local file
                    localStream.Write(buffer, 0, bytesRead);

                    // Increment total bytes processed
                    bytesProcessed += bytesRead;
                } while (bytesRead > 0);
            }
        }
        catch (Exception e)
        {
            Helper.LogError(e);
        }
        finally
        {
            if (response != null) response.Close();
            if (remoteStream != null) remoteStream.Close();
            if (localStream != null) localStream.Close();
        }

        // Return total bytes processed to caller.
        return bytesProcessed;
    }