1.同步异步是对方法执行顺序的描述
同步(sync):等待上一行执行完毕之后,才会进入下一行,会阻塞方法的执行,会卡住界面,只有一个线程在计算,方法计算是有序的
异步(async):不会等待方法的完成,会直接进入下一行,是非阻塞的,不会卡住界面,多个线程并发计算,是无序执行的
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
namespace TBYB
{
public partial class Frm_TBYB : Form
{
public Frm_TBYB()
{
InitializeComponent();
}
/// <summary>
/// 异步方法
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_Async_Click(object sender, EventArgs e)
{
Console.WriteLine($"*****btnAsync_Click Start {Thread.CurrentThread.ManagedThreadId}*****");
Action<string> action = DoSomeThingLong;
//同步调用委托
action.Invoke("btn_Async_Click_1");
//异步调用委托
action.BeginInvoke("btn_Async_Click_2", null, null);
Console.WriteLine($"******btn_Async_Click End{Thread.CurrentThread.ManagedThreadId}*****");
}
private void btn_Sync_Click(object sender, EventArgs e)
{
Console.WriteLine($"*****btn_Sync_Click Start {Thread.CurrentThread.ManagedThreadId.ToString("00")}{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")}*****");
int j = 3;
int k = 5;
int m = j + k;
for (int i = 0; i < 5; i++)
{
string name = string.Format($"btn_Sync_Click_{i}");
this.DoSomeThingLong(name);
}
}
private void DoSomeThingLong(string name)
{
Console.WriteLine($"*****DoSomethingLong{name} Start {Thread.CurrentThread.ManagedThreadId.ToString("00")}{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")}*****");
long result = 0;
for (int i = 0; i < 100000; i++)
{
result = result + i;
}
Console.WriteLine($"*****DoSomething{name} end {Thread.CurrentThread.ManagedThreadId.ToString("00")}{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff")}{result}*****");
}
}
}