using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace asyncApp
{
public partial class FrmAsync : Form
{
public FrmAsync()
{
InitializeComponent();
}
public int ExecuteTask1(int num)
{
Thread.Sleep(5000);
return num * num;
}
public int ExecuteTask2(int num)
{
return num * num;
}
private void btnExectue1_Click(object sender, EventArgs e)
{
this.lblCount1.Text = ExecuteTask1(10).ToString();
this.lblCount2.Text = ExecuteTask2(10).ToString();
}
private void btnExecute2_Click(object sender, EventArgs e)
{
MyDelegate dete = ExecuteTask1;
//异步操作执行状态借口
IAsyncResult result = dete.BeginInvoke(10,null,null);
this.lblCount1.Text = "正在计算......";
this.lblCount2.Text = ExecuteTask2(10).ToString();
//EndInvoke方法借助IAsyncResult借口对象,不断地查询异步调用是否结束;
//该方法知道异步调用的方法所有参数,所以异步调用完毕以后,取出异步调用结果作为返回值
int res = dete.EndInvoke(result);
this.lblCount1.Text = res.ToString();
}
public delegate int MyDelegate(int num);
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace asyncAppCallback
{
public partial class FrmAppCallback : Form
{
public FrmAppCallback()
{
InitializeComponent();
this.objCal = new MyDelegate(ExecuteTask);//初始化成员变量
//this.objCal = (num, ms)=>
//{
// Thread.Sleep(ms);
// return num * num;
//};
}
//【1】声明一个委托
public delegate int MyDelegate(int num, int ms);
//【2】根据委托声明一个方法
private int ExecuteTask(int num, int ms)
{
Thread.Sleep(ms);
return num * num;
}
//【3】创建委托变量
MyDelegate objCal = null;//ExecuteTask;
//【4】同步执行多个任务
private void btnExecu_Click(object sender, EventArgs e)
{
for (int i = 1; i <= 10; i++)
{
objCal.BeginInvoke(10 * i, 1000 * i, MyCallback,i);
}
}
//【5】创建回调函数
private void MyCallback(IAsyncResult result)
{
int res= objCal.EndInvoke(result);
//异步显示结果
Console.WriteLine("第{0}个计算结果:{1}",result.AsyncState,res);
}
}
}