winform 多线程

Posted 2023-05-05

这里有两个按钮,按"启动线程"时,启动一个线程,这个线程的作用是从0开始,每秒累加1,值显示在文本框中,而点"终止线程"时,终止线程,也不再计数了,
本人试过很多办法,要么是UI死掉,要么是线程无法终止而导致无法关闭程序,拜托各位大虾帮帮忙了...在这里先谢过各位了,呵呵

楼上的应该不行吧 在子线程里不能直接使用控件...需要建立委托
下面是我写的：
public partial class Form1 : Form

Thread thread=null;
int n = 0;
bool severIsRun=false;//用来村示线程是否启动
private delegate void myDelegate(string str);//定义委托
private void setRich(string str)//委托

if (this.textBox1.InvokeRequired)

myDelegate md = new myDelegate(this.setRich);
this.Invoke(md, new object[] str );

else
this.textBox1.Text ＝str;


public Form1()

InitializeComponent();


private void run()

while(true)

setRich((n++).toString());
Thread.Sleep(1000);



private void button1_Click(object sender, EventArgs e)

if(!severIsRun)

ThreadStart ts =new ThreadStart(run);
Thread = new Thread(ts);
severIsRun=true;
thread.Start();



private void button2_Click(object sender, EventArgs e)

if(severIsRun)

thread.Abort();
severIsRun=false;



private void Form1_FormClosing(object sender, FormClosingEventArgs e)

if(severIsRun)

thread.Abort();
severIsRun=false;



主要是想告诉你，控件是主线程的，子线程要想用必需建立委托，不然会出错
还有一种方法比较简单，但那种不安全，就不说了， 有不明白的你可以找我 参考技术A 看看是不是你要的

public partial class Form1 : Form

Thread thread;
static int n = 0;
public Form1()

InitializeComponent();


private void run()

while(true)

textBox1.Text = Convert.ToString(n++);
Thread.Sleep(1000);



private void button1_Click(object sender, EventArgs e)

thread = new Thread(new ThreadStart(run));
thread.Start();


private void button2_Click(object sender, EventArgs e)

try

if (thread.IsAlive)
thread.Abort();

catch


private void Form1_FormClosing(object sender, FormClosingEventArgs e)

button2_Click(sender, (EventArgs)e);
参考技术B ls，这道题根本不需要委托，主线程并没有用到textbox，1L的程序就可以了，不是说只要多线程就要委托，这种简单的题目没有必要，只是增加程序复杂度而已 参考技术C 顺便加一句 Thread t = new Thread(method);
t.IsBackground = true;//设为后台线程，在主程序关闭的结束未终止的线程
t.Start(); 参考技术D 同意 “hen总受伤的我” 的，子线程调用主线程控件需要用委托

WinForm 多线程+委托来防止界面假死

参考： http://www.cnblogs.com/xpvincent/archive/2013/08/19/3268001.html

当有大量数据需要计算、显示在界面或者调用sleep函数时，容易导致界面卡死，可以采用多线程加委托的方法解决；

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 WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        DataTable table;
        int currentIndex = 0;
        int max = 10000;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            buttonOK.Enabled = false;
            Thread thread = new Thread(new ThreadStart(LoadData));
            thread.IsBackground = true;
            thread.Start();

            progressBar1.Minimum = 0;
            progressBar1.Maximum = max;
        }

        private void LoadData()
        {
            SetLabelText("数据加载中...");
            currentIndex = 0;
            table = new DataTable();
            table.Columns.Add("id");
            table.Columns.Add("name");
            table.Columns.Add("age");
            while (currentIndex < max)
            {
                SetLabelText(string.Format("当前行:{0},剩余量:{1},完成比例:{2}%",
                    currentIndex, max - currentIndex, (Convert.ToDecimal(currentIndex) / Convert.ToDecimal(max) * 100).ToString()));
                SetPbValue(currentIndex);
                DataRow dr = table.NewRow();
                dr["id"] = currentIndex;
                dr["name"] = "张三";
                dr["age"] = currentIndex + 5;
                table.Rows.Add(dr);
                currentIndex++;
            }

            SetDgvDataSource(table);
            SetLabelText("数据加载完成");

            this.BeginInvoke(new MethodInvoker(delegate()
            {
                buttonOK.Enabled = true;
            }));
        }

        delegate void labDelegate(string str);
        private void SetLabelText(string str)
        {
            if (textBox1.InvokeRequired)
            {
                Invoke(new labDelegate(SetLabelText), new string[] { str });
            }
            else
            {
                textBox1.Text = str;
            }
        }

        delegate void dgvDelegate(DataTable table);
        private void SetDgvDataSource(DataTable table)
        {
            if (dataGridView1.InvokeRequired)
            {
                Invoke(new dgvDelegate(SetDgvDataSource), new object[] { table });
            }
            else
            {
                dataGridView1.DataSource = table;
            }
        }

        private delegate void pbDelegate(int value);
        private void SetPbValue(int value)
        {
            if (progressBar1.InvokeRequired)
            {
                Invoke(new pbDelegate(SetPbValue), new object[] { value });

            }
            else
            {
                progressBar1.Value = value;
            }
        }

    }
}

 完整Demo下载