问Image.FromStream(MemoryStream)中的参数无效

EN

    private void SendData()
    {
        StreamWriter swWriter = new StreamWriter(this._nsClient);
        // BinaryFormatter bfFormater = new BinaryFormatter();

        // this method
        lock (this._secLocker)
        {
            while (this._bShareScreen)
            {
                // Check if you need to send the screen
                if (this._bShareScreen)
                {
                    MemoryStream msStream = new MemoryStream();
                    this._imgScreenSend = new Bitmap(this._imgScreenSend.Width,   this._imgScreenSend.Height);
                    // Send an image code
                    swWriter.WriteLine(General.IMAGE);
                    swWriter.Flush();

                    // Copy image from screen
                    this._grGraphics.CopyFromScreen(0, 0, 0, 0, this._sizScreenSize);
                    this._imgScreenSend.Save(msStream, System.Drawing.Imaging.ImageFormat.Jpeg);
                    msStream.Seek(0, SeekOrigin.Begin);

                    // Create the pakage
                    byte[] btPackage = msStream.ToArray();

                    // Send its langth
                    swWriter.WriteLine(btPackage.Length.ToString());
                    swWriter.Flush();

                    // Send the package
                    _nsClient.Write(btPackage, 0, btPackage.Length);
                    _nsClient.Flush();
                }
            }
        }
    }


    private void ReciveData()
    {
        StreamReader srReader = new StreamReader(this._nsClient);
        string strMsgCode = String.Empty;
        bool    bContinue = true;
        //BinaryFormatter bfFormater = new BinaryFormatter();
        DataContractSerializer x = new DataContractSerializer(typeof(Image));
        // Lock this method
        lock (this._objLocker)
        {
            while (bContinue)
            {
                // Get the next msg
                strMsgCode = srReader.ReadLine();

                // Check code
                switch (strMsgCode)
                {
                    case (General.IMAGE):
                        {
                            // Read bytearray
                            int nSize = int.Parse(srReader.ReadLine().ToString());
                            byte[] btImageStream = new byte[nSize];
                            this._nsClient.Read(btImageStream, 0, nSize);

                            // Get the Stream
                            MemoryStream msImageStream = new MemoryStream(btImageStream, 0, btImageStream.Length);

                            // Set seek, so we read the image from the begining of the stream
                            msImageStream.Position = 0;

                            // Build the image from the stream
                            this._imgScreenImg = Image.FromStream(msImageStream); // Error Here