MethodInvoker和Invoker

来源：互联网发布：网络彩票牌照编辑：程序博客网时间：2024/06/18 18:09
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.Windows.Forms;namespace SQL_browser{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            /*             * 1.MethodInvoke和Action都是方法返回类型为空的委托.             * 2.MethodInvoker的原型定义为---> public delegate void MethodInvoker();             */            //Delegate d1 = (MethodInvoker)delegate { };            //Delegate d2 = (MethodInvoker)(() => { });            //Delegate d3 = (Action)delegate { };            //Delegate d4 = (Action)(() => { });            Thread t = new Thread(() =>            {                Enumerable.Range(1, 10).ToList().ForEach(x =>                {                    if (listBox1.InvokeRequired)                    {                        listBox1.Invoke((Action)(() =>                        {                            listBox1.Items.Add(string.Format("[{0}] executed 【  (Action)(() => {{ }})  】", x));                        }));                    }                });                Enumerable.Range(11, 10).ToList().ForEach(x =>                {                    if (listBox1.InvokeRequired)                    {                        listBox1.Invoke((Action)delegate                        {                            listBox1.Items.Add(string.Format("[{0}] executed 【  (Action)delegate {{ }}  】", x));                        });                    }                });                Enumerable.Range(21, 10).ToList().ForEach(x =>                {                    if (listBox1.InvokeRequired)                    {                        listBox1.CCInvoke(() =>     //使用lambda表达式                        {                            listBox1.Items.Add(string.Format("[{0}] executed 【  lambda  】", x));                        });                        listBox1.CCInvoke(delegate  //使用委托                        {                            listBox1.Items.Add(string.Format("[{0}] executed 【  delegate  】", x));                        });                    }                });            });            t.Start();        }    }        private void button2_Click(object sender, EventArgs e)        {            listBox1.Items.Clear();            Task taskWithFactoryAndState1 = Task.Factory.StartNew<List<int>>((stateObj) =>            {                               List<int> ints = new List<int>();                for (int i = 0; i < (int)stateObj; i++)                {                    ints.Add(i);                }                return ints;            }, 100).ContinueWith(ant =>            {                                listBox1.DataSource = ant.Result;            }, TaskScheduler.FromCurrentSynchronizationContext());        }    public static class ControlExtend    {        public static void CCInvoke(this Control control, Action action)        {            if (control.IsDisposed)            return;        try        {            control.Invoke((Delegate)action);        }        catch (ObjectDisposedException ode)        {        }        catch (InvalidOperationException iox)        {        }        }    }}</int></int></int>
注意：button2_Click的方法会阻塞UI线程，如果数据量大或者里面的方法很耗时，界面会有卡死假象，比如窗体拖不动
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