1、只有 BasicHttpBinding、NetTcpBinding 和 NetNamedPipeBinding 支持传送流数据。
2、 流数据类型必须是可序列化的 Stream 或 MemoryStream。
3、 传递时消息体(Message Body)中不能包含其他数据。
4、TransferMode的限制和MaxReceivedMessageSize的限制等。
下面具体实现：新建一个WCFService，接口文件的代码如下：
{
[OperationContract(Action="UploadFile",IsOneWay=true)]voidUploadFile(FileUploadMessagerequest);
}
[MessageContract]publicclassFileUploadMessage
{[MessageHeader(MustUnderstand=true)]publicstringSavePath;[MessageHeader(MustUnderstand=true)]publicstringFileName;[MessageBodyMember(Order=1)]publicStreamFileData;}{[OperationContract(Action="UploadFile",IsOneWay=true)]voidUploadFile(FileUploadMessagerequest);}
[ServiceContract] public interface IUpLoadService { [OperationContract(Action = "UploadFile", IsOneWay = true)] void UploadFile(FileUploadMessage request); }
[MessageContract] public class FileUploadMessage { [MessageHeader(MustUnderstand = true)] public string SavePath;
[MessageHeader(MustUnderstand = true)] public string FileName;
[MessageBodyMember(Order = 1)] public Stream FileData;
}
定义FileUploadMessage类的目的是因为第三个限制，要不然文件名和存放路径就没办法传递给WCF了，根据第二个限制，文件数据是用System.IO.Stream来传递的
接口方法只有一个，就是上传文件，注意方法参数是FileUploadMessage
接口实现类文件的代码如下：
public class UpLoadService : IUpLoadService { public void UploadFile(FileUploadMessage request) { string uploadFolder = @"C:kkk"; string savaPath = request.SavePath; string dateString = DateTime.Now.ToShortDateString() + @""; string fileName = request.FileName; Stream sourceStream = request.FileData; FileStream targetStream = null; if (!sourceStream.CanRead) { throw new Exception("数据流不可读!"); } if (savaPath == null) savaPath = @"Photo"; if (!savaPath.EndsWith("\")) savaPath += "\";
uploadFolder = uploadFolder + savaPath + dateString; if (!Directory.Exists(uploadFolder)) { Directory.CreateDirectory(uploadFolder); }
string filePath = Path.Combine(uploadFolder, fileName); using (targetStream = new FileStream(filePath, FileMode.Create, FileAccess.Write, FileShare.None)) { //read from the input stream in 4K chunks //and save to output stream 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); } targetStream.Close(); sourceStream.Close(); } }
}
实现的功能是到指定目录下按照日期进行目录划分，然后以传过来的文件名保存文件。
这篇文章最主要的地方就是下面的Web.Config配置：
<system.serviceModel><bindings><basicHttpBinding><bindingname="FileTransferServicesBinding"maxReceivedMessageSize="9223372036854775807"messageEncoding="Mtom"transferMode="Streamed"sendTimeout="00:10:00"/></basicHttpBinding></bindings><services><servicebehaviorConfiguration="UploadWcfService.UpLoadServiceBehavior"name="UploadWcfService.UpLoadService"><endpointaddress=""binding="basicHttpBinding"bindingConfiguration="FileTransferServicesBinding"contract="UploadWcfService.IUpLoadService"></endpoint><endpointaddress="mex"binding="mexHttpBinding"contract="IMetadataExchange"/></service></services><behaviors><serviceBehaviors><behaviorname="UploadWcfService.UpLoadServiceBehavior"><serviceMetadatahttpGetEnabled="true"/><serviceDebugincludeExceptionDetailInFaults="false"/></behavior></serviceBehaviors></behaviors></system.serviceModel>
配置要遵循上面的第一条和第四条限制，因为默认.net只能传4M的文件，所以要在 <System.Web>配置节下面加上<httpRuntimemaxRequestLength="2097151"/>
这样WCFService就完成了，新建一个Console项目或者Web项目测试一下。要注意的是Client端的配置必须要和服务端一样，实例程序在这里下载。