c# - WCF 服务返回 400 错误 : The body of the message cannot be read because it is empty

Question

我有一个 WCF 服务，这让我有点头疼。我启用了跟踪，我有一个正在构建并传入数据协定的对象，但我在日志中看到此错误:

<TraceData>
            <DataItem>
                <TraceRecord xmlns="http://schemas.microsoft.com/2004/10/E2ETraceEvent/TraceRecord" Severity="Error">
                    <TraceIdentifier>http://msdn.microsoft.com/en-US/library/System.ServiceModel.Diagnostics.ThrowingException.aspx</TraceIdentifier>
                    <Description>Throwing an exception.</Description>
                    <AppDomain>efb0d0d7-1-129315381593520544</AppDomain>
                    <Exception>
                        <ExceptionType>System.ServiceModel.ProtocolException, System.ServiceModel, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType>
                        <Message>There is a problem with the XML that was received from the network. See inner exception for more details.</Message>
                        <StackTrace>
                            at System.ServiceModel.Channels.HttpRequestContext.CreateMessage()
                            at System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext context, Action callback)
                            at System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result)
                            at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.HandleRequest()
                            at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
                            at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(Object state)
                            at System.Runtime.IOThreadScheduler.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
                            at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
                            at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
                        </StackTrace>
                        <ExceptionString>
                            System.ServiceModel.ProtocolException: There is a problem with the XML that was received from the network. See inner exception for more details. ---&amp;gt; System.Xml.XmlException: The body of the message cannot be read because it is empty.
                            --- End of inner exception stack trace ---
                        </ExceptionString>
                        <InnerException>
                            <ExceptionType>System.Xml.XmlException, System.Xml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</ExceptionType>
                            <Message>The body of the message cannot be read because it is empty.</Message>
                            <StackTrace>
                                at System.ServiceModel.Channels.HttpRequestContext.CreateMessage()
                                at System.ServiceModel.Channels.HttpChannelListener.HttpContextReceived(HttpRequestContext context, Action callback)
                                at System.ServiceModel.Activation.HostedHttpTransportManager.HttpContextReceived(HostedHttpRequestAsyncResult result)
                                at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.HandleRequest()
                                at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.BeginRequest()
                                at System.ServiceModel.Activation.HostedHttpRequestAsyncResult.OnBeginRequest(Object state)
                                at System.Runtime.IOThreadScheduler.ScheduledOverlapped.IOCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* nativeOverlapped)
                                at System.Runtime.Fx.IOCompletionThunk.UnhandledExceptionFrame(UInt32 error, UInt32 bytesRead, NativeOverlapped* nativeOverlapped)
                                at System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)
                            </StackTrace>
                            <ExceptionString>System.Xml.XmlException: The body of the message cannot be read because it is empty.</ExceptionString>
                        </InnerException>
                    </Exception>
                </TraceRecord>
            </DataItem>
        </TraceData>

所以，这是我的服务界面:

[ServiceContract]
    public interface IRDCService
    {
        [OperationContract]
        Response<Customer> GetCustomer(CustomerRequest request);

        [OperationContract]
        Response<Customer> GetSiteCustomers(CustomerRequest request);
    }

这是我的服务实例

public class RDCService : IRDCService
    {
        ICustomerService customerService;

        public RDCService()
        {
            //We have to locate the instance from structuremap manually because web services *REQUIRE* a default constructor
            customerService = ServiceLocator.Locate<ICustomerService>();
        }

        public Response<Customer> GetCustomer(CustomerRequest request)
        {
            return customerService.GetCustomer(request);
        }

        public Response<Customer> GetSiteCustomers(CustomerRequest request)
        {
            return customerService.GetSiteCustomers(request);
        }
    }

Web 服务(服务器端)的配置如下所示:

<system.serviceModel>
        <diagnostics>
            <messageLogging logMalformedMessages="true" logMessagesAtServiceLevel="true"
                logMessagesAtTransportLevel="true" />
        </diagnostics>
        <services>
            <service behaviorConfiguration="MySite.Web.Services.RDCServiceBehavior"
                name="MySite.Web.Services.RDCService">
                <endpoint address="http://localhost:27433" binding="wsHttpBinding"
                    contract="MySite.Common.Services.Web.IRDCService">
                    <identity>
                        <dns value="localhost:27433" />
                    </identity>
                </endpoint>
                <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
            </service>
        </services>
        <behaviors>
            <serviceBehaviors>
                <behavior name="MySite.Web.Services.RDCServiceBehavior">
                    <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
                    <serviceMetadata httpGetEnabled="true"/>
                    <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
                    <serviceDebug includeExceptionDetailInFaults="true"/>


                    <dataContractSerializer maxItemsInObjectGraph="6553600" />
                </behavior>
            </serviceBehaviors>
        </behaviors>
    </system.serviceModel>

这是我的请求对象的样子

[DataContract]
    public class CustomerRequest : RequestBase
    {
        [DataMember]
        public int Id { get; set; }

        [DataMember]
        public int SiteId { get; set; }
    }

和 RequestBase:

[DataContract]
    public abstract class RequestBase : IRequest
    {
        #region IRequest Members

        [DataMember]
        public int PageSize { get; set; }

        [DataMember]
        public int PageIndex { get; set; }

        #endregion
    }

还有我的 IRequest 接口(interface)

public interface IRequest
    {
        int PageSize { get; set; }
        int PageIndex { get; set; }
    }

我有一个围绕我的服务调用的包装器类。这是类(class)。

public class MyService : IMyService
    {
        IRDCService service;

        public MyService()
        {
            //service = new MySite.RDCService.RDCServiceClient();
            EndpointAddress address = new EndpointAddress(APISettings.Default.ServiceUrl);
            BasicHttpBinding binding = new BasicHttpBinding(BasicHttpSecurityMode.None);
            binding.TransferMode = TransferMode.Streamed;
            binding.MaxBufferSize = 65536;
            binding.MaxReceivedMessageSize = 4194304;

            ChannelFactory<IRDCService> factory = new ChannelFactory<IRDCService>(binding, address);
            service = factory.CreateChannel();
        }

        public Response<Customer> GetCustomer(CustomerRequest request)
        {
            return service.GetCustomer(request);
        }

        public Response<Customer> GetSiteCustomers(CustomerRequest request)
        {
            return service.GetSiteCustomers(request);
        }
    }

最后是响应对象。

[DataContract]
    public class Response<T>
    {
        [DataMember]
        public IEnumerable<T> Results { get; set; }

        [DataMember]
        public int TotalResults { get; set; }

        [DataMember]
        public int PageIndex { get; set; }

        [DataMember]
        public int PageSize { get; set; }

        [DataMember]
        public RulesException Exception { get; set; }
    }

因此，当我构建我的 CustomerRequest 对象并将其传入时，出于某种原因，它作为空请求发送到服务器。任何想法为什么？我试过增加对象图和消息大小。当我调试时，它在包装类中停止并出现 400 错误。我不确定是否存在序列化错误，但考虑到对象契约是 4 个整数属性，我无法想象它会导致问题。

Answer 1

如果遇到此问题，您需要在本地 IIS 上运行 WCF 应用程序。

转到 wcf 应用程序项目的属性并选择“使用本地 iis web 服务器”。

并且需要在添加/删除windows功能中启用Microsoft .Net Framework 3.1 -> Windows communication foundation http激活。

打开你的visual studio命令窗口

然后你必须运行aspnet_regiis -i

你需要运行 servicemodelreg -ia

运行了很多次，出现错误，搜索谷歌，冲洗，重复。花了大约一个小时才弄清楚。皮塔饼。