listBox1.InvokeRequired学习

控件只能由创建它的线程来访问。其他线程想访问必须调用该控件的Invoke方法。Invoke有两个参数，一个是委托方法，一个是参数值。下面代码就是举例为ListBox添加数据。

using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Threading;

namespace TestAutoUpEBooks
{
    public partial class Form1 : Form
    {
        delegate void SetListBox(string[] strValues);                   定义委托

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Thread tr = new Thread(new ThreadStart(SetListBoxV));   创建线程
            tr.Start();                                                                              启动线程
        }

        private void SetListBoxV()
        {
            string[] s = new string[3] {"a","b","c"};
            SetListBoxValue(s);
        }

        private void SetListBoxValue(string[] values)
        {
            if (this.listBox1.InvokeRequired)                             当有新工作进程访问控件时InvokeRequired为True
            {
                SetListBox slb = new SetListBox(SetListBoxValue); 定义委托对象
                listBox1.Invoke(slb, new object[] { values});     用当前工作进程对控件进行访问

        }
            else      对ListBox添加数据
            {
                for (int i = 0; i < values.Length; i++)
                {
                    listBox1.Items.Add((object)values[i]);
                }
            }
        }
    }
}

这样就实现了新建的工作进程对控件的访问。

多线程可以解决用户响应

namespace WindowsFormsApplication6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private delegate void addlistdlg( string str);
        private Thread mythread;

        private void addlistmethod( string mystr)
        {
            listBox1.Items.Add(mystr);
        }
        private void addlistfun()
        {

            for ( int i = 1 ; i < 90000 ; i ++ )
            {
                string mystr = " 第 " + i.ToString() + " 个 " ;

                if (listBox1.InvokeRequired)
                    listBox1.Invoke( new addlistdlg(addlistmethod), new Object[] { mystr });
                else
                    listBox1.Items.Add(mystr);
            }
        }

        private void button2_Click( object sender, EventArgs e) // 执行就会卡死
        {
            mythread = new Thread( new ThreadStart(addlistfun));
            mythread.Start();
        }
    }
}

if (listBox1.InvokeRequired)
listBox1.Invoke(new addlistdlg(addlistmethod), new Object[] { mystr });
else
listBox1.Items.Add(mystr);

的else部分只是我帮你补完整而已，就是变成如果不是线程里运行也可以执行的通用代码
实例在里这是每次执行
listBox1.Invoke(new addlistdlg(addlistmethod), new Object[] { mystr });
的

namespace WindowsFormsApplication6
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private delegate void addlistdlg(string str);
        private Thread mythread;

        private void addlistmethod(string mystr)
        {
            listBox1.Items.Add(mystr);
        }
        private void addlistfun()
        {

            for (int i = 1; i < 90000; i++)
            {
                string mystr = "第" + i.ToString() + "个";

                if (listBox1.InvokeRequired)
                    listBox1.Invoke(new addlistdlg(addlistmethod), new Object[] { mystr });
                else
                    listBox1.Items.Add(mystr);
                Thread.Sleep(1000);
            }
        }

        private void button2_Click(object sender, EventArgs e)//执行就会卡死
        {
            mythread = new Thread(new ThreadStart(addlistfun));
            mythread.Start();
        }
    }
}

在循环中加Thread.Sleep(1000);