Receive Class

.NET Framework (current version)

An activity that receives a message.

Namespace:   System.ServiceModel.Activities
Assembly:  System.ServiceModel.Activities (in System.ServiceModel.Activities.dll)


public sealed class Receive : Activity


Initializes a new instance of the Receive class.


Gets or sets the value of the action header of the message.


Gets the identifier of the cache that is unique within the scope of the workflow definition.(Inherited from Activity.)


Gets or sets a value that indicates whether a new workflow instance is created to process the message if the message does not correlate to an existing workflow instance..


Gets or sets the data to receive. The content can be either a ReceiveMessageContent or a ReceiveParametersContent.


Gets or sets the MessageQuerySet used to query the message to extract correlation data.


Gets or sets a correlation handle that is used to route the message to the appropriate workflow instance.


Gets a collection of correlation initializers that initialize query-based, context, callback context, or request-reply correlations with a Send activity runs.


Gets or sets an optional friendly name that is used for debugging, validation, exception handling, and tracking.(Inherited from Activity.)


Gets an identifier that is unique in the scope of the workflow definition.(Inherited from Activity.)


Gets or sets the version of the implementation used.(Inherited from Activity.)


Gets a collection of known types for the operation.


Gets or sets the name of the operation implemented by the Receive.


Gets or sets a value that indicates the protection level for the operation.


Gets or sets a value that specifies the serializer to use for this operation.


Gets or sets the name of the service contract.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Returns the receive activity from the given contract operation description.


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Returns a value that indicates whether the CorrelatesOn property has changed from its default value and should be serialized.


Indicates whether the DisplayName property should be serialized.(Inherited from Activity.)


Returns a String that contains the Id and DisplayName of the Activity.(Inherited from Activity.)

The Receive activity can receive a single item or multiple items depending on the type of receive content used.


When a workflow contains multiple Receive activities with the same operation name, the CorrelatesOn property must be set to the same set of correlation queries.

The following example shows how to create a Receive activity and add it to a workflow in code.

Variable<string> message = new Variable<string> { Name = "message" };
Variable<string> echo = new Variable<string> { Name = "echo" };
Receive receiveString = new Receive
    OperationName = "Echo",
    ServiceContractName = "Echo",
    CanCreateInstance = true,
    //parameters for receive
    Content = new ReceiveParametersContent
        Parameters = 
            {"message", new OutArgument<string>(message)}

Sequence workflow = new Sequence()
    Variables = { message, echo },
    Activities =
            new WriteLine
                Text = new InArgument<string>(env =>("Message received: " + message.Get(env)))
            new Assign<string>
                Value = new InArgument<string>(env =>("<echo> " + message.Get(env))),
                To = new OutArgument<string>(echo)
            //parameters for reply
            new SendReply
                Request = receiveString,                            
                Content = new SendParametersContent
                    Parameters =
                        { "echo", new InArgument<string>(echo) }
            new WriteLine
                Text = new InArgument<string>(env =>("Message sent: " + echo.Get(env)))

service = new WorkflowService
    Name = "Echo",
    Body = workflow

The following example shows how to create a Receive activity and add it to a workflow service in XAML.

<WorkflowService mc:Ignorable="sap" ConfigurationName="Service1" Name="Service1" mva:VisualBasic.Settings="Assembly references and imported namespaces serialized as XML namespaces" xmlns="" xmlns:mc="" xmlns:mv="clr-namespace:Microsoft.VisualBasic;assembly=System" xmlns:mva="clr-namespace:Microsoft.VisualBasic.Activities;assembly=System.Activities" xmlns:p="" 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:sad="clr-namespace:System.Activities.Debugger;assembly=System.Activities" xmlns:sap="" 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:st="clr-namespace:System.Text;assembly=mscorlib" xmlns:x="">
  <p:Sequence sad:XamlDebuggerXmlReader.FileName="c:\Projects\WFServiceSnippets\WFServiceSnippets\Service1.xamlx" sap:VirtualizedContainerService.HintSize="277,644" mva:VisualBasic.Settings="Assembly references and imported namespaces serialized as XML namespaces">
      <p:Variable x:TypeArguments="CorrelationHandle" Name="__handle1" />
      <p:Variable x:TypeArguments="x:String" Name="Message" />
      <p:Variable x:TypeArguments="x:String" Name="Echo" />
      <scg3:Dictionary x:TypeArguments="x:String, x:Object">
        <x:Boolean x:Key="IsExpanded">True</x:Boolean>
    <Receive x:Name="__ReferenceID0" CanCreateInstance="True" DisplayName="ReceiveString" sap:VirtualizedContainerService.HintSize="255,90" OperationName="Echo" ServiceContractName="Echo">
        <RequestReplyCorrelationInitializer CorrelationHandle="[__handle1]" />
        <p:OutArgument x:TypeArguments="x:String" x:Key="message">[Message]</p:OutArgument>
    <p:WriteLine sap:VirtualizedContainerService.HintSize="255,61" Text="[&quot;Message received: &quot; + Message]" />
    <p:Assign sap:VirtualizedContainerService.HintSize="255,58">
        <p:OutArgument x:TypeArguments="x:String">[Echo]</p:OutArgument>
        <p:InArgument x:TypeArguments="x:String">["&lt;echo&gt; " + Message]</p:InArgument>
    <SendReply Request="{x:Reference __ReferenceID0}" DisplayName="SendReply" sap:VirtualizedContainerService.HintSize="255,90">
        <p:InArgument x:TypeArguments="x:String" x:Key="echo">[Echo]</p:InArgument>
    <p:WriteLine sap:VirtualizedContainerService.HintSize="255,61" Text="[&quot;Message sent: &quot; + Echo]" />

.NET Framework
Available since 4.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Return to top