使用 XAML + X:name 动态创建 WWF 工作流不起作用

Question

I am creating a custom workflow activities, these activities have a base class as shown below

public class BaseClass : SequenceActivity
{ }

public class Activity1 : BaseClass
{ }

public class Activity2 : BaseClass
{ }

Then I write the xoml of the workflow as shown below

<GS1:Activity1 x:Name="Activity2"></GS1:Activity1>
<GS1:Activity2 x:Name="Activity3"></GS1:Activity2>

everything works fine until i want to start the workflow

workflowRuntime.CreateWorkflow(Type.GetType("WorkflowType Full Name"), null, Guid.NewGuid());

I get the below error

error 1538: Activity 'BaseClass' validation failed: There is already an activity named 'BaseClass'. Activity names must be unique.

Note that the above was working correctly on WF3.5, this error appeared when I upgraded to WF4.0.

Any help is very appreciated.

Answer 1

It looks like you are combining WF3 and WF4 classes here. It is a bit confusing because they are similar and both have an Activity class but there is no relation. The WorkflowRuntime is a WF3 type. With WF4 you can use the WorkflowApplication or the WorkflowInvoker to run a workflow.