合同操作'DownloadStream'需要Windows标识才能进行自动模拟
我最近更改了我的绑定配置以允许在我的WCF服务中进行模拟。通过实现这一点，我被要求使用缓冲的TransferMode.Buffered而不是流式传输。虽然这似乎解决了我的问题一段时间，但我注意到大文件（> 200MB）在尝试分配MemoryStream以传递消息时会抛出异常。我的同事和谷歌让我相信Chunking是答案，我已经尝试实现这个样本的一个版本：
MSDN Chunking文章
我修改了TCPChunkingBinding类以从BasicHttpBinding而不是Binding派生，并添加了我们在尝试分块之前使用的必需BasicHttpSecurity属性。
以前使用BasicHttpBinding的所有端点现在都使用TCPChunkingBinding。以下是我对TCPChunkingBinding类所做的修改：
TcpChunkingBinding : BasicHttpBinding, IBindingRuntimePreferences
void Initialize()
{
be = new ChunkingBindingElement();
tcpbe = new TcpTransportBindingElement();
tcpbe.TransferMode = TransferMode.Buffered; //no transport streaming
tcpbe.MaxReceivedMessageSize = ChunkingUtils.ChunkSize + 100 * 1024; //add 100KB for headers
this.MessageEncoding = WSMessageEncoding.Mtom;
this.SendTimeout = new TimeSpan(0, 5, 0);
this.ReceiveTimeout = this.SendTimeout;
this.TransferMode = TransferMode.Buffered;
BasicHttpSecurity security = new BasicHttpSecurity();
security.Mode = BasicHttpSecurityMode.TransportCredentialOnly;
security.Transport.ClientCredentialType = HttpClientCredentialType.Windows;
security.Transport.ProxyCredentialType = HttpProxyCredentialType.None;
security.Transport.Realm = string.Empty;
security.Message.ClientCredentialType = BasicHttpMessageCredentialType.UserName;
security.Message.AlgorithmSuite = System.ServiceModel.Security.SecurityAlgorithmSuite.Default;
this.Security = security;
The contract operation 'DownloadStream' requires Windows identity for automatic impersonation. A Windows identity that represents the caller is not provided by binding ('TcpChunkingBinding','http://tempuri.org/') for contract ('ITestService','http://tempuri.org/'.
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