前幾天分享了分享了WCF聊天程序--WCFChat ,本文和大家一起分享利用WCF實現文件的傳輸。
程序運行效果:
接收文件端:
發送文件端:連接WCF服務,選擇要傳輸的文件
文件傳輸成功:
我們會在保存文件的默認路徑:C:/Documents and Settings/Administrator/桌面,下看到傳輸的文件:
代碼分析:
這里就不一一的闡述每一句代碼的作用了,感興趣的朋友可以下載,文后會有下載鏈接。說下值得注意的地方:
前兩天有人在百度知道中問能不能把WCF中的契約單獨封裝到一個類庫中,當時感覺多此一舉,無意中看到把接口單獨分出去,有個很好的應用,就是利用通道實現客戶端代理。
ITransfer.cs
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.ServiceModel;using System.Runtime.Serialization;using System.Threading;using System.IO;namespace FileInterface{ [ServiceContract] public interface ITransfer { [OperationContract(Action = "UploadFile")] void TransferFile(FileTransferMessage request);//文件傳輸 } [MessageContract] public class FileTransferMessage { [MessageHeader(MustUnderstand = true)] public string SavePath;//文件保存路徑 [MessageHeader(MustUnderstand = true)] public string FileName;//文件名稱 [MessageBodyMember(Order = 1)] public Stream FileData;//文件傳輸時間 }}
利用通道創建客戶端代理:
if (_proxy == null) { try { NetTcpBinding binding = new NetTcpBinding(); binding.TransferMode = TransferMode.Streamed; binding.SendTimeout = new TimeSpan(0, 30, 0); //利用通道創建客戶端代理 _proxy = ChannelFactory<ITransfer>.CreateChannel(binding, new EndpointAddress(CBSerURL.Text)); IContextChannel obj = _proxy as IContextChannel; //string s = obj.SessionId; } catch (Exception ex) { MessageBox.Show(ex.Message); return; }
這樣,既不用添加服務引用,也不需要生成代理。
文件傳輸的函數不是很難,代碼如下:
public void TransferFile(FileTransferMessage request) { string logInfo; Program.Get_ILog().Log(logInfo = string.Format("開始接收文件,name={0}", request.FileName));//填寫日志 //文件信息 string uploadFolder = AppValue.GetParam()._saveDir; string savaPath = request.SavePath; string fileName = request.FileName; Stream sourceStream = request.FileData; FileStream targetStream = null; //判斷文件是否可讀 if (!sourceStream.CanRead) { throw new Exception("數據流不可讀!"); } if (savaPath == null) savaPath = @"文件傳輸/"; if (!savaPath.EndsWith("http://")) savaPath += "http://"; if (!uploadFolder.EndsWith("http://")) uploadFolder += "http://"; uploadFolder = uploadFolder + savaPath; //創建保存文件夾 if (!Directory.Exists(uploadFolder)) { Directory.CreateDirectory(uploadFolder); } int fileSize = 0; string filePath = Path.Combine(uploadFolder, fileName);//Combine合并兩個路徑 try { //文件流傳輸 using (targetStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None)) { //定義文件緩沖區 const int bufferLen = 4096; byte[] buffer = new byte[bufferLen]; int count = 0; while ((count = sourceStream.Read(buffer, 0, bufferLen)) > 0) { targetStream.Write(buffer, 0, count); fileSize += count; } targetStream.Close(); sourceStream.Close(); } } catch (Exception ex) { Program.Get_ILog().Log(logInfo + ex.Message); } Program.Get_ILog().Log(string.Format("接收文件完畢 name={0},filesize={1}", request.FileName, fileSize)); }
其他的代碼感興趣的朋友下載來研究吧!
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