如何在XAML Windows工作流基础中有条件地使用InvokeMethod [英] How to conditionally use InvokeMethod in an XAML Windows workflow foundation

问题描述

在Windows工作流基础序列工作流中，如何使用根据特定条件被调用的invoke方法标记?

In windows workflow foundation sequence workflow, How to use invoke method tags to be invoked based on certain condition?

例如，

<Sequence>
  <Sequence.Variables>
<Variable x:TypeArguments="x:String" Default="[&quot;this is an out param&quot;]" Name="outParam" />
  <Variable x:TypeArguments="x:Int32" Name="resultValue" />
  <Variable x:TypeArguments="msi:TestClass" Default="[New TestClass()]" Name="varTestClass" />
</Sequence.Variables>
<sap:WorkflowViewStateService.ViewState>
  <scg:Dictionary x:TypeArguments="x:String, s:Object">
    <x:Boolean x:Key="IsExpanded">True</x:Boolean>
  </scg:Dictionary>
</sap:WorkflowViewStateService.ViewState>
<WriteLine sap:VirtualizedContainerService.HintSize="299.663333333333,59.2766666666667" Text="[&quot;Instance method call&quot;]" />
<InvokeMethod DisplayName="Instance Method Call" sap:VirtualizedContainerService.HintSize="299.663333333333,127.553333333333" MethodName="InstanceMethod1">
  <InvokeMethod.TargetObject>
    <InArgument x:TypeArguments="msi:TestClass">[New TestClass()]</InArgument>
  </InvokeMethod.TargetObject>
</InvokeMethod>
<InvokeMethod DisplayName="Instance Method Call with Parameters" sap:VirtualizedContainerService.HintSize="299.663333333333,127.553333333333" MethodName="InstanceMethod">
  <InvokeMethod.TargetObject>
    <InArgument x:TypeArguments="msi:TestClass">[New TestClass()]</InArgument>
  </InvokeMethod.TargetObject>
  <InArgument x:TypeArguments="x:String">["My favorite number is"]</InArgument>
  <InArgument x:TypeArguments="x:Int32">42</InArgument>
</InvokeMethod>
</Sequence>

假设我调用上述活动，所有的invoke方法都将被触发.

Suppose, I call the above activity, all the invoke methods will be triggered.

但是需要的是类似的东西

But what is needed, is something like,

<Sequence>
  <Sequence.Variables>
<Variable x:TypeArguments="x:String" Default="[&quot;this is an out param&quot;]" Name="outParam" />
  <Variable x:TypeArguments="x:Int32" Name="resultValue" />
  <Variable x:TypeArguments="msi:TestClass" Default="[New TestClass()]" Name="varTestClass" />
</Sequence.Variables>
<sap:WorkflowViewStateService.ViewState>
  <scg:Dictionary x:TypeArguments="x:String, s:Object">
    <x:Boolean x:Key="IsExpanded">True</x:Boolean>
  </scg:Dictionary>
</sap:WorkflowViewStateService.ViewState>
<WriteLine sap:VirtualizedContainerService.HintSize="299.663333333333,59.2766666666667" Text="[&quot;Instance method call&quot;]" />
//If (stateArgument =="created")
//{
<InvokeMethod DisplayName="Instance Method Call" sap:VirtualizedContainerService.HintSize="299.663333333333,127.553333333333" MethodName="InstanceMethod1">
  <InvokeMethod.TargetObject>
    <InArgument x:TypeArguments="msi:TestClass">[New TestClass()]</InArgument>
  </InvokeMethod.TargetObject>
</InvokeMethod>
//}
//else if(stateArguement == "running")
//{
<InvokeMethod DisplayName="Instance Method Call with Parameters" sap:VirtualizedContainerService.HintSize="299.663333333333,127.553333333333" MethodName="InstanceMethod">
  <InvokeMethod.TargetObject>
    <InArgument x:TypeArguments="msi:TestClass">[New TestClass()]</InArgument>
  </InvokeMethod.TargetObject>
  <InArgument x:TypeArguments="x:String">["My favorite number is"]</InArgument>
  <InArgument x:TypeArguments="x:Int32">42</InArgument>
</InvokeMethod>
//}
</Sequence>

有人可以提出一些建议吗?

Can someone give some idea how to go about this?

推荐答案

您可以使用If活动(在命名空间System.Activities.Statements中)有条件地执行工作流的各个部分:

You can use the If activity (in namespace System.Activities.Statements) for conditionally executing pieces of a workflow:

<If DisplayName="Invoke something based on a conditional" sap2010:WorkflowViewState.IdRef="If_1">
    <If.Condition>
        <InArgument x:TypeArguments="x:Boolean">
            <mca:CSharpValue x:TypeArguments="x:Boolean">1 == 2</mca:CSharpValue>
        </InArgument>
    </If.Condition>
    <If.Then>
        <InvokeMethod sap2010:WorkflowViewState.IdRef="InvokeMethod_1" MethodName="WriteSomething" TargetType="local:MyStatics" />
    </If.Then>
    <If.Else>
        <InvokeMethod sap2010:WorkflowViewState.IdRef="InvokeMethod_2" MethodName="WriteSomethingElse" TargetType="local:MyStatics" />
    </If.Else>
</If>

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