C#异步调用实例小结
本文实例讲述了C#异步调用的方法。分享给大家供大家参考。具体如下：
usingSystem;
usingSystem.Collections.Generic;
usingSystem.ComponentModel;
usingSystem.Data;
usingSystem.Drawing;
usingSystem.Text;
usingSystem.Threading;
usingSystem.Windows.Forms;
namespaceCW
{
publicpartialclassAsyncDemo:Form
{
publicAsyncDemo()
{
InitializeComponent();
}
privatevoidDelgate_Load(objectsender,EventArgse)
{
}
///<summary>
///实现委托的方法
///</summary>
///<paramname="iCallTime"></param>
///<paramname="iExecThread"></param>
///<returns></returns>
stringLongRunningMethod(intiCallTime,outintiExecThread)
{
Thread.Sleep(iCallTime);
iExecThread=AppDomain.GetCurrentThreadId();
return"MyCallTimewas"+iCallTime.ToString();
}
delegatestringMethodDelegate(intiCallTime,outintiExecThread);
#region示例1：同步调用方法#region示例1：同步调用方法
///<summary>
///示例1：同步调用方法
///</summary>
publicvoidDemoSyncCall()
{
strings;
intiExecThread;
//CreateaninstanceofadelegatethatwrapsLongRunningMethod.
MethodDelegatedlgt=newMethodDelegate(this.LongRunningMethod);
//CallLongRunningMethodusingthedelegate.
s=dlgt(3000,outiExecThread);
MessageBox.Show(string.Format("Thedelegatecallreturnedthestring:{0},andthethreadID{1}",s,iExecThread.ToString()));
}
#endregion
#region示例2：通过EndInvoke()调用模式异步调用方法
///<summary>
///示例2：通过EndInvoke()调用模式异步调用方法
///</summary>
publicvoidDemoEndInvoke()
{
MethodDelegatedlgt=newMethodDelegate(this.LongRunningMethod);
strings;
intiExecThread;
//Initiatetheasynchronouscall.
IAsyncResultar=dlgt.BeginInvoke(5000,outiExecThread,null,null);
//Dosomeusefulworkhere.Thiswouldbeworkyouwanttohave
//runatthesametimeastheasynchronouscall.
//Retrievetheresultsoftheasynchronouscall.
s=dlgt.EndInvoke(outiExecThread,ar);
MessageBox.Show(string.Format("Thedelegatecallreturnedthestring:{0},andthenumber{1}",s,iExecThread.ToString()));
}
#endregion
#region示例3：异步调用方法并使用AWaitHandle来等待调用完成
///<summary>
///示例3：异步调用方法并使用AWaitHandle来等待调用完成
///</summary>
publicvoidDemoWaitHandle()
{
strings;
intiExecThread;
MethodDelegatedlgt=newMethodDelegate(this.LongRunningMethod);
//Initiatetheasynchronouscall.
IAsyncResultar=dlgt.BeginInvoke(3000,outiExecThread,null,null);
//Dosomeusefulworkhere.Thiswouldbeworkyouwanttohave
//runatthesametimeastheasynchronouscall.
//WaitfortheWaitHandletobecomesignaled.
ar.AsyncWaitHandle.WaitOne();
//Gettheresultsoftheasynchronouscall.
s=dlgt.EndInvoke(outiExecThread,ar);
MessageBox.Show(string.Format("Thedelegatecallreturnedthestring:{0},andthenumber{1}",s,iExecThread.ToString()));
}
#endregion
#region示例4：异步调用方法通过轮询调用模式
///<summary>
///示例4：异步调用方法通过轮询调用模式
///</summary>
publicvoidDemoPolling()
{
MethodDelegatedlgt=newMethodDelegate(this.LongRunningMethod);
strings;
intiExecThread;
//Initiatetheasynchronouscall.
IAsyncResultar=dlgt.BeginInvoke(3000,outiExecThread,null,null);
//PollIAsyncResult.IsCompleted
while(ar.IsCompleted==false)
{
Thread.Sleep(10);//pretendtososomeusefulwork
}
s=dlgt.EndInvoke(outiExecThread,ar);
MessageBox.Show(string.Format("Thedelegatecallreturnedthestring:{0},andthenumber{1}",s,iExecThread.ToString()));
}
#endregion
#region示例5：异步方法完成后执行回调
///<summary>
///示例5：异步方法完成后执行回调
///</summary>
publicvoidDemoCallback()
{
MethodDelegatedlgt=newMethodDelegate(this.LongRunningMethod);
intiExecThread;
//Createthecallbackdelegate.
AsyncCallbackcb=newAsyncCallback(MyAsyncCallback);
//InitiatetheAsynchronouscallpassinginthecallbackdelegate
//andthedelegateobjectusedtoinitiatethecall.
IAsyncResultar=dlgt.BeginInvoke(5000,outiExecThread,cb,dlgt);
}
publicvoidMyAsyncCallback(IAsyncResultar)
{
strings;
intiExecThread;
//BecauseyoupassedyouroriginaldelegateintheasyncStateparameter
//oftheBegincall,youcangetitbackheretocompletethecall.
MethodDelegatedlgt=(MethodDelegate)ar.AsyncState;
//Completethecall.
s=dlgt.EndInvoke(outiExecThread,ar);
MessageBox.Show(String.Format("Thedelegatecallreturnedthestring:{0},andthenumber{1}",s,iExecThread.ToString()));
//Console.WriteLine(string.Format("Thedelegatecallreturnedthestring:"{0}",andthenumber{1}",s,iExecThread.ToString()));
}
#endregion
privatevoidbutton1_Click(objectsender,EventArgse)
{
//DemoSyncCall();
//DemoEndInvoke();
//DemoWaitHandle();
//DemoPolling();
DemoCallback();
}
}
}
希望本文所述对大家的C#程序设计有所帮助。