有返回值的Bookmark

首先代码创建Activity:

public sealed class WaitForResponse:NativeActivity
{
public WaitForResponse()
:base()
{}
public string ResponseName { get; set; }
protected override bool CanInduceIdle => true;
protected override void Execute(NativeActivityContext context)
{
context.CreateBookmark(this.ResponseName, new BookmarkCallback(this.ReceivedResponse)); //这里加入BookmarkCallback, 用来设置返回值
}
void ReceivedResponse(NativeActivityContext context,Bookmark bookmark,object obj)
{
this.Result.Set(context, (TResult)obj);
}
}

创建Workflow:

在Branch1中创建一个变量myVar, 然后在创建的Activity中设置Result为myVar, 这个myVar会接收这个Activity创建Bookmark时返回的值. 

测试:

public partial class Form1 : Form
{
static WorkflowApplication wfapp;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
wfapp = new WorkflowApplication(new ActivityLibrary1.Activity1());
wfapp.Idle = MyIdle;
wfapp.Run();
ThreadPool.QueueUserWorkItem(ReadName); //传入的关键, 不然workflow不会resume, Pick会运行到Branch2中去
}
void MyIdle(WorkflowApplicationIdleEventArgs e)
{
Console.WriteLine("Idle:" + e.InstanceId);
}
static void ReadName(object state)
{
string text = "abc";
// Resume the Activity that set this bookmark (ReadString).
Form1.wfapp.ResumeBookmark("P1", text);

}
}

转载于:https://www.cnblogs.com/hzb2001/p/9066667.html