async,await,Task 的一些用法

async,await,Task 的一些用法

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private void Form1_Load(object sender, EventArgs e) {     Display(); }   public async void Display() {     int result = await GetValueAsync(123);     this.label1.Text = "Value is : " + result; }   public Task<int> GetValueAsync(int num) {     // 方法1     return Task.Run(() =>     {         return DoSomething(num);     });       // 方法2     return Task.Run(() =>     {         //DoSomething         System.Threading.Thread.Sleep(3000);         return num;     });       // 方法3     object state = num;     Task<int> task = new Task<int>(DoSomething, state);     task.Start();     return task; }   public int DoSomething(int num) {     System.Threading.Thread.Sleep(3000);     return num; }   public int DoSomething(object state) {     System.Threading.Thread.Sleep(3000);     return Convert.ToInt32(state); }