基于TCP协议的WCF传输大文件如何出现进度条
RT.
比如传输50M的文件,
我能显示个进度条 2000Kb of 5000Kb 已传输40%.
有回复了加分.

[解决办法]
不建议用WCF做文件传输
参考以下代码（VS2008下测试通过）
Service端：

C# code

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ServiceModel;using System.IO;using System.ServiceModel.Dispatcher;using System.ServiceModel.Description;using System.ServiceModel.Channels;namespace FSDownloadService{    [MessageContract]    public class MyFileInfo    {        [MessageHeader]        public string FileName;        [MessageHeader]        public long FileSize;        [MessageBodyMember]        public Stream Stream;        public MyFileInfo() { }        public MyFileInfo(Stream stream, string fileName, long fileSize)        {            this.Stream = stream;            this.FileSize = fileSize;            this.FileName = fileName;        }    }    [MessageContract]    public class DownloadFileRequest    {        [MessageBodyMember]        public readonly string FileName;        public DownloadFileRequest() { }        public DownloadFileRequest(string fileName)        {            this.FileName = fileName;        }    }    [ServiceContract]    public interface IFileManager    {        [OperationContract]        MyFileInfo DownloadFile(DownloadFileRequest request);           }    [ServiceBehavior(IncludeExceptionDetailInFaults = true)]    public class MyService : IFileManager    {        public MyFileInfo DownloadFile(DownloadFileRequest request)        {            FileInfo fi = new FileInfo(request.FileName);            MyFileInfo result = new MyFileInfo(File.OpenRead(request.FileName), request.FileName, fi.Length);            return result;        }     }    public class MyHost    {           static ServiceHost host = null;        public static void Open()        {            string baseAddress = "net.tcp://localhost:2008/FileService";            host = new ServiceHost(typeof(MyService), new Uri(baseAddress));            host.AddServiceEndpoint(typeof(IFileManager), GetTcpBinding(), "");            host.Open();        }        public static void Close()        {            if (host != null && host.State == CommunicationState.Opened)            {                host.Close();            }            host = null;        }                public static Binding GetTcpBinding()        {            NetTcpBinding binding = new NetTcpBinding();                        binding.TransferMode = TransferMode.Streamed;            binding.MaxReceivedMessageSize = int.MaxValue;            return binding;        }    }}