Question

我有一个WF4 WCF服务，我试图通过soap消息使用基于内容的工作获得相关性。

我收到以下错误消息：

<Message>A correlation query yielded an empty result set. Please ensure correlation queries for the endpoint are correctly configured.</Message>
           <StackTrace><![CDATA[at System.ServiceModel.Activities.Dispatcher.CorrelationKeyCalculator.Calculator`1.CalculateKeys(T target, Message messageToReadHeaders, InstanceKey& instanceKey, ICollection`1& additionalKeys)
   at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.GetInstanceKeys(OperationContext operationContext, InstanceKey& instanceKey, ICollection`1& additionalKeys)
at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.ControlOperationAsyncResult.EnsureInstanceId()
at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.ControlOperationAsyncResult.Process()
at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.ControlOperationAsyncResult..ctor(ControlOperationInvoker invoker, Object[] inputs, IInvokeReceivedNotification notification, TimeSpan timeout, AsyncCallback callback, Object state)
at System.ServiceModel.Activities.Dispatcher.ControlOperationInvoker.InvokeBegin(Object instance, Object[] inputs, IInvokeReceivedNotification notification, AsyncCallback callback, Object state)
at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)]]></StackTrace>

这是我的班级

[MessageContract(IsWrapped = false)]
public class ClaimObj
{
    [MessageHeader]
    public string CorrelationId { get; set; }

    [MessageBodyMember]
    public string InstanceId { get; set; }
}

这是我的xaml，由于专有原因而更改了名称空间

<Activity mc:Ignorable="sap" x:Class="Project.WorkFlow.Activities.Activity4" sap:VirtualizedContainerService.HintSize="654,676" mva:VisualBasic.Settings="Assembly references and imported namespaces for internal implementation" xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities" xmlns:av="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:mv="clr-namespace:Microsoft.VisualBasic;assembly=System" xmlns:mva="clr-namespace:Microsoft.VisualBasic.Activities;assembly=System.Activities" xmlns:p="http://ns.ns2.com/" xmlns:p1="http://schemas.microsoft.com/netfx/2009/xaml/servicemodel" xmlns:qm="clr-namespace:Project.MessageWrappers;assembly=Project.MessageWrappers" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:s1="clr-namespace:System;assembly=System" xmlns:s2="clr-namespace:System;assembly=System.Xml" xmlns:s3="clr-namespace:System;assembly=System.Core" xmlns:sa="clr-namespace:System.Activities;assembly=System.Activities" xmlns:sad="clr-namespace:System.Activities.Debugger;assembly=System.Activities" xmlns:sap="http://schemas.microsoft.com/netfx/2009/xaml/activities/presentation" xmlns:scg="clr-namespace:System.Collections.Generic;assembly=System" xmlns:scg1="clr-namespace:System.Collections.Generic;assembly=System.ServiceModel" xmlns:scg2="clr-namespace:System.Collections.Generic;assembly=System.Core" xmlns:scg3="clr-namespace:System.Collections.Generic;assembly=mscorlib" xmlns:sd="clr-namespace:System.Data;assembly=System.Data" xmlns:sl="clr-namespace:System.Linq;assembly=System.Core" xmlns:ssa="clr-namespace:System.ServiceModel.Activities;assembly=System.ServiceModel.Activities" xmlns:ssx="clr-namespace:System.ServiceModel.XamlIntegration;assembly=System.ServiceModel" xmlns:st="clr-namespace:System.Text;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Flowchart sad:XamlDebuggerXmlReader.FileName="D:\Activity4.xaml" sap:VirtualizedContainerService.HintSize="614,636">
<Flowchart.Variables>
  <Variable x:TypeArguments="qm:ClaimObj" Name="RequestObj" />
  <Variable x:TypeArguments="p1:CorrelationHandle" Name="handle" />
</Flowchart.Variables>
<sap:WorkflowViewStateService.ViewState>
  <scg3:Dictionary x:TypeArguments="x:String, x:Object">
    <x:Boolean x:Key="IsExpanded">False</x:Boolean>
    <av:Point x:Key="ShapeLocation">270,2.5</av:Point>
    <av:Size x:Key="ShapeSize">60,75</av:Size>
    <av:PointCollection x:Key="ConnectorLocation">300,77.5 300,107.5 290,107.5 290,115</av:PointCollection>
  </scg3:Dictionary>
</sap:WorkflowViewStateService.ViewState>
<Flowchart.StartNode>
  <FlowStep x:Name="__ReferenceID1">
    <sap:WorkflowViewStateService.ViewState>
      <scg3:Dictionary x:TypeArguments="x:String, x:Object">
        <av:Point x:Key="ShapeLocation">162.5,115</av:Point>
        <av:Size x:Key="ShapeSize">255,90</av:Size>
        <av:PointCollection x:Key="ConnectorLocation">290,205 290,235</av:PointCollection>
      </scg3:Dictionary>
    </sap:WorkflowViewStateService.ViewState>
    <p1:Receive x:Name="__ReferenceID0" CanCreateInstance="True" CorrelatesWith="[handle]" sap:VirtualizedContainerService.HintSize="255,90" OperationName="Process" ServiceContractName="p:IActivity4Service">
      <p1:Receive.CorrelatesOn>
        <p1:XPathMessageQuery x:Key="key1">
          <p1:XPathMessageQuery.Namespaces>
            <ssx:XPathMessageContextMarkup>
              <x:String x:Key="xg0">http://schemas.datacontract.org/2004/07/Project.MessageWrappers</x:String>
            </ssx:XPathMessageContextMarkup>
          </p1:XPathMessageQuery.Namespaces>sm:header()/tempuri:CorrelationId</p1:XPathMessageQuery>
      </p1:Receive.CorrelatesOn>
      <p1:ReceiveMessageContent DeclaredMessageType="qm:ClaimObj">
        <OutArgument x:TypeArguments="qm:ClaimObj">[RequestObj]</OutArgument>
      </p1:ReceiveMessageContent>
    </p1:Receive>
    <FlowStep.Next>
      <FlowStep x:Name="__ReferenceID2">
        <sap:WorkflowViewStateService.ViewState>
          <scg3:Dictionary x:TypeArguments="x:String, x:Object">
            <av:Point x:Key="ShapeLocation">162.5,235</av:Point>
            <av:Size x:Key="ShapeSize">255,90</av:Size>
          </scg3:Dictionary>
        </sap:WorkflowViewStateService.ViewState>
        <p1:SendReply Request="{x:Reference __ReferenceID0}" DisplayName="SendReplyToReceive" sap:VirtualizedContainerService.HintSize="255,90">
          <p1:SendMessageContent DeclaredMessageType="qm:ClaimObj">
            <InArgument x:TypeArguments="qm:ClaimObj">[RequestObj]</InArgument>
          </p1:SendMessageContent>
        </p1:SendReply>
      </FlowStep>
    </FlowStep.Next>
  </FlowStep>
</Flowchart.StartNode>
<x:Reference>__ReferenceID1</x:Reference>
<x:Reference>__ReferenceID2</x:Reference>

我知道问题在于我的xpath用于关联。我尝试了很多不同的想法，唯一有效的是11445（http://msdn.microsoft.com/en-us/library/ee358742.aspx），但这并没有给我跟踪相关性。这些没有工作

sm:body()/xg0:ClaimObj/xg0:CorrelationId    
sm:header()/tempuri:CorrelationId
sm:header()/xg0:ClaimObj/xg0:CorrelationId
sm:header()/tempuri:ClaimObj/tempuri:CorrelationId

我可以使用DataContracts，但我需要使用MessageContracts

更新：这是我真正需要做的事情：

接收请求
向服务器X发送单向wcf调用（第二次接收）服务器X在具有相关ID的新wcf呼叫中发送回工作流，而不是回复
做一些其他的事情发送回复原件接收

这是我尝试工作的基本工作流程。问题是由于找不到xpath，因此未调用第二个接收。

在旁注中，当我尝试在第一次接收中使用correlationinitializer时，我得到同样的问题

<Activity mc:Ignorable="sap" x:Class="Project.WorkFlow.Activities.Activity4" sap:VirtualizedContainerService.HintSize="828,872" mva:VisualBasic.Settings="Assembly references and imported namespaces for internal implementation" xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities" xmlns:av="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:mv="clr-namespace:Microsoft.VisualBasic;assembly=System" xmlns:mva="clr-namespace:Microsoft.VisualBasic.Activities;assembly=System.Activities" xmlns:p="http://ns.domain.com/" xmlns:p1="http://schemas.microsoft.com/netfx/2009/xaml/servicemodel" xmlns:qm="clr-namespace:Project.MessageWrappers;assembly=Project.MessageWrappers" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:s1="clr-namespace:System;assembly=System" xmlns:s2="clr-namespace:System;assembly=System.Xml" xmlns:s3="clr-namespace:System;assembly=System.Core" xmlns:sa="clr-namespace:System.Activities;assembly=System.Activities" xmlns:sad="clr-namespace:System.Activities.Debugger;assembly=System.Activities" xmlns:sap="http://schemas.microsoft.com/netfx/2009/xaml/activities/presentation" xmlns:scg="clr-namespace:System.Collections.Generic;assembly=System" xmlns:scg1="clr-namespace:System.Collections.Generic;assembly=System.ServiceModel" xmlns:scg2="clr-namespace:System.Collections.Generic;assembly=System.Core" xmlns:scg3="clr-namespace:System.Collections.Generic;assembly=mscorlib" xmlns:sd="clr-namespace:System.Data;assembly=System.Data" xmlns:sl="clr-namespace:System.Linq;assembly=System.Core" xmlns:ssa="clr-namespace:System.ServiceModel.Activities;assembly=System.ServiceModel.Activities" xmlns:ssx="clr-namespace:System.ServiceModel.XamlIntegration;assembly=System.ServiceModel" xmlns:st="clr-namespace:System.Text;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Flowchart sad:XamlDebuggerXmlReader.FileName="D:\Activity4.xaml" sap:VirtualizedContainerService.HintSize="788,832">
<Flowchart.Variables>
  <Variable x:TypeArguments="qm:ClaimObj" Name="RequestObj" />
  <Variable x:TypeArguments="p1:CorrelationHandle" Name="handle" />
  <Variable x:TypeArguments="qm:GetClaimObj" Name="GetClaimIn" />
</Flowchart.Variables>
<sap:WorkflowViewStateService.ViewState>
  <scg3:Dictionary x:TypeArguments="x:String, x:Object">
    <x:Boolean x:Key="IsExpanded">False</x:Boolean>
    <av:Point x:Key="ShapeLocation">270,2.5</av:Point>
    <av:Size x:Key="ShapeSize">60,75</av:Size>
    <av:PointCollection x:Key="ConnectorLocation">300,77.5 300,107.5 290,107.5 290,115</av:PointCollection>
    <x:Double x:Key="Width">773.5</x:Double>
    <x:Double x:Key="Height">796.04</x:Double>
  </scg3:Dictionary>
</sap:WorkflowViewStateService.ViewState>
<Flowchart.StartNode>
  <FlowStep x:Name="__ReferenceID1">
    <sap:WorkflowViewStateService.ViewState>
      <scg3:Dictionary x:TypeArguments="x:String, x:Object">
        <av:Point x:Key="ShapeLocation">162.5,115</av:Point>
        <av:Size x:Key="ShapeSize">255,90</av:Size>
        <av:PointCollection x:Key="ConnectorLocation">290,205 290,209 241,209 241,239</av:PointCollection>
      </scg3:Dictionary>
    </sap:WorkflowViewStateService.ViewState>
    <p1:Receive x:Name="__ReferenceID0" CanCreateInstance="True" CorrelatesWith="[handle]" sap:VirtualizedContainerService.HintSize="255,90" OperationName="Process" ServiceContractName="p:IActivity4Service">
      <p1:Receive.KnownTypes>
        <x:Type Type="qm:ClaimObj" />
      </p1:Receive.KnownTypes>
      <p1:ReceiveMessageContent DeclaredMessageType="qm:ClaimObj">
        <OutArgument x:TypeArguments="qm:ClaimObj">[RequestObj]</OutArgument>
      </p1:ReceiveMessageContent>
    </p1:Receive>
    <FlowStep.Next>
      <FlowStep x:Name="__ReferenceID2">
        <sap:WorkflowViewStateService.ViewState>
          <scg3:Dictionary x:TypeArguments="x:String, x:Object">
            <av:Point x:Key="ShapeLocation">120,239</av:Point>
            <av:Size x:Key="ShapeSize">242,93</av:Size>
            <av:PointCollection x:Key="ConnectorLocation">241,332 240,332 240,355</av:PointCollection>
          </scg3:Dictionary>
        </sap:WorkflowViewStateService.ViewState>
        <p1:InitializeCorrelation Correlation="[handle]" sap:VirtualizedContainerService.HintSize="242,93">
          <InArgument x:TypeArguments="x:String" x:Key="key1">[RequestObj.CorrelationId]</InArgument>
        </p1:InitializeCorrelation>
        <FlowStep.Next>
          <FlowStep x:Name="__ReferenceID3">
            <sap:WorkflowViewStateService.ViewState>
              <scg3:Dictionary x:TypeArguments="x:String, x:Object">
                <av:Point x:Key="ShapeLocation">112.5,355</av:Point>
                <av:Size x:Key="ShapeSize">255,90</av:Size>
                <av:PointCollection x:Key="ConnectorLocation">240,445 240,475 241,475 241,479</av:PointCollection>
              </scg3:Dictionary>
            </sap:WorkflowViewStateService.ViewState>
            <p1:Receive CorrelatesWith="[handle]" sap:VirtualizedContainerService.HintSize="255,90" OperationName="GetClaim" ServiceContractName="p:IActivity4Service">
              <p1:Receive.CorrelatesOn>
                <p1:XPathMessageQuery x:Key="key1">
                  <p1:XPathMessageQuery.Namespaces>
                    <ssx:XPathMessageContextMarkup>
                      <x:String x:Key="xg0">http://schemas.datacontract.org/2004/07/Project.MessageWrappers</x:String>
                    </ssx:XPathMessageContextMarkup>
                  </p1:XPathMessageQuery.Namespaces>sm:header()/xg0:CorrelationId</p1:XPathMessageQuery>
              </p1:Receive.CorrelatesOn>
              <p1:ReceiveMessageContent DeclaredMessageType="qm:GetClaimObj">
                <OutArgument x:TypeArguments="qm:GetClaimObj">[GetClaimIn]</OutArgument>
              </p1:ReceiveMessageContent>
            </p1:Receive>
            <FlowStep.Next>
              <FlowStep x:Name="__ReferenceID4">
                <sap:WorkflowViewStateService.ViewState>
                  <scg3:Dictionary x:TypeArguments="x:String, x:Object">
                    <av:Point x:Key="ShapeLocation">120,479</av:Point>
                    <av:Size x:Key="ShapeSize">242,58</av:Size>
                    <av:PointCollection x:Key="ConnectorLocation">241,537 240,537 240,565</av:PointCollection>
                  </scg3:Dictionary>
                </sap:WorkflowViewStateService.ViewState>
                <Assign sap:VirtualizedContainerService.HintSize="242,58">
                  <Assign.To>
                    <OutArgument x:TypeArguments="x:String">[GetClaimIn.InstanceId]</OutArgument>
                  </Assign.To>
                  <Assign.Value>
                    <InArgument x:TypeArguments="x:String">Get is called</InArgument>
                  </Assign.Value>
                </Assign>
                <FlowStep.Next>
                  <FlowStep x:Name="__ReferenceID5">
                    <sap:WorkflowViewStateService.ViewState>
                      <scg3:Dictionary x:TypeArguments="x:String, x:Object">
                        <av:Point x:Key="ShapeLocation">112.5,565</av:Point>
                        <av:Size x:Key="ShapeSize">255,90</av:Size>
                      </scg3:Dictionary>
                    </sap:WorkflowViewStateService.ViewState>
                    <p1:SendReply Request="{x:Reference __ReferenceID0}" DisplayName="SendReplyToReceive" sap:VirtualizedContainerService.HintSize="255,90">
                      <p1:SendMessageContent DeclaredMessageType="qm:GetClaimObj">
                        <InArgument x:TypeArguments="qm:GetClaimObj">[GetClaimIn]</InArgument>
                      </p1:SendMessageContent>
                    </p1:SendReply>
                  </FlowStep>
                </FlowStep.Next>
              </FlowStep>
            </FlowStep.Next>
          </FlowStep>
        </FlowStep.Next>
      </FlowStep>
    </FlowStep.Next>
  </FlowStep>
</Flowchart.StartNode>
<x:Reference>__ReferenceID1</x:Reference>
<x:Reference>__ReferenceID2</x:Reference>
<x:Reference>__ReferenceID3</x:Reference>
<x:Reference>__ReferenceID4</x:Reference>
<x:Reference>__ReferenceID5</x:Reference>

Answer 1

我在XAML中缺少CorrelationInitializers。 CorrelationInitializers用于在Receive或SendReply活动上创建与原始请求的关联。之后，CorrelatesOn将用于后续的Receive活动。

Answer 2

我遇到了同样的问题，你链接的文章确实帮我解决了。在页面下方约3/4处，有一段内容为......

如果XPath查询配置不正确，则无关联检索数据，返回错误，并显示以下消息：“A 相关性查询产生一个空的结果集。请确保正确配置了端点的相关性查询。“一快速解决这个问题的方法是用一个替换XPath查询字面值，如上一节所述。这个问题可以如果在“添加关联”中使用“XPath查询”构建器，则会出现此问题初始化器或CorrelatesOn定义对话框和您的工作流程服务使用消息合同。

对话框始终生成以邮件正文属性为目标的查询，即使您选择的属性是邮件头的一部分也是如此。访问标头属性的正确查询是：

sm:header()/namespace:property

请注意，属性名称不受包含对象限定，因此以下查询应该适用于您：

sm:header()/tempuri:CorrelationId

如果您想更改header属性的名称空间，请使用Namespace类的MessageHeaderAttribute属性。

WF4 WCF关联和MessageContract无法正常工作

2 个答案: