类名

System.Activities.Statements.Delay

文件

System.Activities.dll

结构说明

继承 NativeActivity

是一个 sealed类

override 了 [CacheMetadata方法] 与 [Execute方法] 与 [Cancel 方法] 与 [Abort方法]

override 了[CanInduceIdle 属性]

[Duration] 属性 的类型为[InArgument<System.TimeSpan>]

功能说明

1.延迟，按指定的时间阻止当前的工作流执行。 持续时间过期后，工作流继续执行

2.[Duration]属性,表示阻止当前的工作流执行的时间

3.会触发实例的[OnIdel],但在[WorkflowApplicationIdleEventArgs.Bookmarks]中无[Bookmark]

流程

宿主

#region //Delay 例子

static void workflowCompleted(WorkflowApplicationCompletedEventArgs e)

{

System.Console.WriteLine("完成,实例编号:{0},状态:{1}", e.InstanceId, e.CompletionState.ToString());

}

static void workflowIdle(WorkflowApplicationIdleEventArgs e)

{

System.Console.WriteLine("Idle,实例编号:{0}", e.InstanceId);

foreach (var item in e.Bookmarks)

{

System.Console.WriteLine("BookmarkName:{0}", item.BookmarkName);

}

}

static void delayWorkflow()

{

WorkflowApplication instance = new WorkflowApplication(new DelayWorkflow());

instance.Completed = new Action<WorkflowApplicationCompletedEventArgs>(workflowCompleted);

instance.Idle = workflowIdle;

instance.Run();

}

#endregion

结果

ThreadSleepActivity

public sealed class ThreadSleepActivity : CodeActivity

{

protected override void Execute(CodeActivityContext context)

{

System.Threading.Thread.Sleep(10000);

}

}

工作流

宿主

WorkflowInvoker.Invoke(new ThreadSleepParallelWorkflow());

结果

[Parallel]是用单线程完成分支的,所以两个[ThreadSleepActivity],的[Thread.Sleep(10000)]共产生了20秒的延时

如果[Parallel]是用多线程完成分支的,两个并行的[Thread.Sleep(10000)]会只产生了10秒的延时

工作流

宿主

WorkflowInvoker.Invoke(new DelayParallelWorkflow());

结果

结合[例:Parallel是单线程运行的],可以得出Delay并不是Thread.Sleep

Delay的实现原理我会在后面的文章中详细说明

runtimeTestActivity

public sealed class runtimeTestActivity : CodeActivity

{

protected override void Execute(CodeActivityContext context)

{

for (int i = 1; i <= 10; i++)

{

System.Threading.Thread.Sleep(500);

System.Console.WriteLine(i);

}

}

}

流程

宿主

static void workflowInvoker()

{

WorkflowInvoker.Invoke(new runtimeTestWorkflow());

WorkflowInvoker.Invoke(new runtimeTestWorkflow());

}

结果

可以当第一个实例完成后,第二个实例才启动

runtimeTestActivity

public sealed class runtimeTestActivity : CodeActivity

{

protected override void Execute(CodeActivityContext context)

{

for (int i = 1; i <= 10; i++)

{

System.Threading.Thread.Sleep(500);

System.Console.WriteLine(i);

}

}

}

流程

宿主

static void workflowApplication()

{

WorkflowApplication instance1 = new WorkflowApplication(new runtimeTestWorkflow());

WorkflowApplication instance2 = new WorkflowApplication(new runtimeTestWorkflow());

instance1.Run();

instance2.Run();

}

结果

第一个实例启动后,第二个实例也启动了,两个实例是同时在两个线程上运行

1.为要实现该功能的方法添加如下两个方法

IAsyncResult Begin[原史方法] ([原史方法参数], AsyncCallback callback, object asyncState)

void End[原史方法] (IAsyncResult r)

2.当[RunAsynchronously]属性设为[False]时, [InvokeMethod]调用[原史方法]

3.当[RunAsynchronously]属性设为[True]时, [InvokeMethod]调用对应的[Begin原史方法]与[End原史方法]方法

4.如果没的提供与[原史方法]对应的[Begin原史方法]与[End原史方法]方法, [InvokeMethod]将忽略[RunAsynchronously]属性的值

MethodName属性的[Begin原史方法]和[End原史方法]不会调用，调用的是[原史方法]

public class myAsyncResult : IAsyncResult

{

public object AsyncState

{

get; set;

}

public System.Threading.WaitHandle AsyncWaitHandle

{

get; set;

}

public bool CompletedSynchronously

{

get

{

return false;

}

}

public bool IsCompleted

{

get

{

return true;

}

}

}

public class threadMethod

{

AsyncCallback callback;

IAsyncResult asyncResult;

int n;

int result;

public void myCall ( int n )

{

for (int i = 1; i <= n; i++)

{

result = result + i;

}

System.Console.WriteLine("myCal, resultl:{0}", result);

}

public IAsyncResult BeginmyCall ( int n , AsyncCallback callback, object asyncState)

{

System.Console.WriteLine("BeginmyCall,n:{0}", n);

this.n = n;

this.callback = callback;

this.asyncResult = new myAsyncResult() { AsyncState = asyncState };

System.Threading.Thread thread = new System.Threading.Thread(new System.Threading.ThreadStart(myProcessThread));

thread.Start();

return this.asyncResult;

}

public void EndmyCall (IAsyncResult r)

{

Console.WriteLine("EndmyCall, result:{0}",result);

}

public void myProcessThread()

{

Console.WriteLine("myProcessThread");

for (int i = 1; i <= n; i++)

{

result = result + i;

System.Console.WriteLine(i);

System.Threading.Thread.Sleep(500);

}

this.callback(this.asyncResult);

}

}

工作流

宿主

#region //    InvokeMethod 异步调用方法例子

static void threadMethodWorkflow()

{

WorkflowApplication instance = new WorkflowApplication(new threadMethodWorkflow());

instance.Completed = completed;

instance.Run();

}

static void completed(WorkflowApplicationCompletedEventArgs e)

{

System.Console.WriteLine("流程完º成");

}

#endregion

结果

要注意的是[InvokeMethod]只调用了 BeginmyCall 与 EndmyCall 方法,并没调用 myCall 方法

public class myAsyncResult : IAsyncResult

{

public object AsyncState

{

get; set;

}

public System.Threading.WaitHandle AsyncWaitHandle

{

get; set;

}

public bool CompletedSynchronously

{

get

{

return true;

}

}

public bool IsCompleted

{

get

{

return true;

}

}

}

结果

要注意的是[InvokeMethod]并没调用 myCall 方法

[InvokeMethod]调用完 BeginmyCall 方法后就立即调用 EndmyCall 方法,并没有等待 [ myProcessThread() ]的完成

流程

结果