C# Socket大文件上传

     public sealed class SocketData
     {
         private SocketData()
         {
         }

         public static SendFileMode SendFile(Socket socket, string fileName, int maxBufferLength)
         {
             SendFileMode flag = SendFileMode.Success;
             try
             {
                 using (Stream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
                 {
                     long fileLength = fs.Length;
                     long leftLength = fileLength;
                     int readLength = ;
                     byte[] buffer = null;
                     var file_name = System.IO.Path.GetFileName(fileName);
                     var bytefileName = System.Text.Encoding.UTF8.GetBytes(file_name + "|" + fs.Length);
                     socket.Send(bytefileName);
                     if (fileLength <= maxBufferLength)
                     {            /* 文件可以一次读取*/
                         buffer = new byte[fileLength];
                         readLength = fs.Read(buffer, , (int)fileLength);
                         //开始发送
                         socket.Send(buffer, SocketFlags.None);
                     }
                     else
                     {
                         while (leftLength != )
                         {
                             if (leftLength < maxBufferLength)
                             {
                                 buffer = new byte[leftLength];
                                 readLength = fs.Read(buffer, , Convert.ToInt32(leftLength));
                             }
                             else
                             {
                                 buffer = new byte[maxBufferLength];
                                 readLength = fs.Read(buffer, , maxBufferLength);
                             }
                             //开始发送
                             socket.Send(buffer, SocketFlags.None);
                             leftLength -= readLength;
                         }
                     }
                 }
             }
             catch (IOException)
             {

                 flag = SendFileMode.IOException;
             }
             return flag;
         }
     }

SocketData

     public enum SendFileMode
     {
         IOException = -,
         TimeOut = -,
         Success = ,
         SendFileError = -,
         SocketException=-
     }

SendFileMode