在WinForm中通过HTTP协议向服务器端上传文件

在WinForm中通过HTTP协议向服务器端上传文件(22)   /// <returns></returns>
  public string GetUrlEvents(string Url,long BufferSize)
  {
  
   StreamReader oHttpResponse = this.GetUrlStream(Url);
   if (oHttpResponse == null)
    return "";

   long lnSize = BufferSize;
   if (this.oWebResponse.ContentLength > 0)
    lnSize = this.oWebResponse.ContentLength;
   else
    lnSize = 0;

   Encoding enc = Encoding.GetEncoding(1252);

   StringBuilder loWriter = new StringBuilder((int) lnSize);
      
   char[] lcTemp = new char[BufferSize];

   OnReceiveDataEventArgs oArgs = new OnReceiveDataEventArgs();
   oArgs.TotalBytes = lnSize;

   lnSize = 1;
   int lnCount = 0;
   long lnTotalBytes = 0;

   while (lnSize > 0)
   {
    lnSize = oHttpResponse.Read(lcTemp,0,(int) BufferSize);
    if (lnSize > 0)
    {
     loWriter.Append( lcTemp,0,(int) lnSize );
     lnCount++;
     lnTotalBytes += lnSize;

     // *** Raise an event if hooked up
     if (this.OnReceiveData != null)
     {
      /// *** Update the event handler
      oArgs.CurrentByteCount = lnTotalBytes;
      oArgs.NumberOfReads = lnCount;
      oArgs.CurrentChunk = lcTemp;
      this.OnReceiveData(this,oArgs);

      // *** Check for cancelled flag