C# Task.Run()运行“含参数和返回值的方法”的用法

Posted 2023-03-30 望乡潭

测试环境：Win10 64位+VS2015 update3；

一、无参数无返回值情况

 private void button9_Click(object sender, EventArgs e)
 
 　　　　//Task.Run(Method0);//报错，在Run(Action)和Run(Func<Task>)之间有二义性；
 　　　　//Task.Run(() => Method0);//× 
 　　　　Task.Run(() =>  Method0(); );
 　　　　Task.Run(new Action(Method0));
 
 
 //无参数，无返回值；
 private void Method0()
 
     Console.WriteLine($"thread ID: Thread.CurrentThread.ManagedThreadId,Hello world.");
 

 

二、有参数无返回值情况

         private void Method1(string str)
         
             Console.WriteLine($"thread ID: Thread.CurrentThread.ManagedThreadId, str");
         
         private void Method1(string str, int times)
         
             string strTemp = $"thread ID: Thread.CurrentThread.ManagedThreadId,";
             for (int i = 0; i < times; i++)
             
                 strTemp += str;
             
             Console.WriteLine(strTemp);
         
         //调用；
         private void button9_Click(object sender, EventArgs e)
                     
             string str = "Elden ring";
             int times = 3;
             Task.Run(() =>  Method1("0 " + str); );
             BeginInvoke(new Action<string>(Method1), "1 " + str);
             BeginInvoke(new Action<string>(Method1), new object[]  "2 " + str );
 
             Task.Run(() =>  Method1("3 " + str, times); );             BeginInvoke(new Action<string, int>(Method1), "4 " + str, times);
             BeginInvoke(new Action<string, int>(Method1), new object[]  "5 " + str, times ); 
         

 

三、有参数有返回值情况

 

         private string Method2(string str)
         
             Console.WriteLine($"thread ID: Thread.CurrentThread.ManagedThreadId");
             return "Hello " + str;
         
         private void button9_Click(object sender, EventArgs e)
         
             
             string elden = "Elden Ring";
             //Task<string> t = Task.Run<string>(() =>  Method2(elden); );
             Task<string> t = Task.Run<string>(() =>  return Method2("1 "+elden); );
             Task<string> t3 = Task.Run(() =>  return Method2("2 " + elden); );
             Console.WriteLine(t.Result);
             Console.WriteLine(t3.Result);
             string temp = string.Empty;
 
             Func<string, string> f = new Func<string, string>(Method2);
             string oo = "haha";
             IAsyncResult result = f.BeginInvoke("3 " + elden, new AsyncCallback((a)=>
             
                 temp = f.EndInvoke(a) + a.AsyncState.ToString();
                 Console.WriteLine(temp);
             ), oo);