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[英]C# 6.0 Approach to Checking if Local Variable or Object is Null (not a field) Using the Null-propagation Operator
[英]How to assign a variable in a workflow if InvokeMethod activity returns an object?
这是Visual Studio属性中的解决方案:
首先向您的工作流程添加一个变量:
将InvokeMethod活动放入您的工作流工作区并编辑属性:
这是XAMLX中的解决方案
xmlns:mca="clr-namespace:Microsoft.CSharp.Activities;assembly=System.Activities"
xmlns:p1="http://schemas.microsoft.com/netfx/2009/xaml/activities"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
xmlns:sap2010="http://schemas.microsoft.com/netfx/2010/xaml/activities/presentation"
<p1:InvokeMethod sap2010:WorkflowViewState.IdRef="InvokeMethod_1" MethodName="YourMethodName" TargetType="x:Object">
<p1:InvokeMethod.Result>
<p1:OutArgument x:TypeArguments="x:Object">
<mca:CSharpReference x:TypeArguments="x:Object">workflowVariableName</mca:CSharpReference>
</p1:OutArgument>
</p1:InvokeMethod.Result>
<p1:InArgument x:TypeArguments="x:Int32">
<mca:CSharpValue x:TypeArguments="x:Int32">variableNamePassedToMyMethod;</mca:CSharpValue>
</p1:InArgument>
</p1:InvokeMethod>
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