C#上位机开发（十）—— 多线程+进度条的使用

1. 界面设计

2. 使用多线程修改进度条

引入多线程类库命名空间：

using System.Threading;

将变量添加到Form1类：

private Thread th;

将方法添加到Form1类：

private void ThreadTask()
{
     int stp;
     int newval;
     Random rnd = new Random();

     while (true)
     {
         stp = this.progressBar1.Step * rnd.Next(-1, 2);
         newval = this.progressBar1.Value + stp;
         if (newval > this.progressBar1.Maximum)
             newval = this.progressBar1.Maximum;
         else if (newval < this.progressBar1.Minimum)
             newval = this.progressBar1.Minimum;
         this.progressBar1.Value = newval;
         Thread.Sleep(100);
     }
 }

在按键回调函数中添加创建线程的代码（设置为后台线程，随程序一起关闭）：

private void button1_Click(object sender, EventArgs e)
 {
     if (button1.Text == "开始")
     {
         button1.Text = "停止";
         th = new Thread(new ThreadStart(ThreadTask));
         th.IsBackground = true;
         th.Start();
     }
     else
     {
         th.Abort();
         button1.Text = "开始";
     }
 }

3. 效果