安全调用线程的步骤
1.声明方法
2.声明委托类型
3.创建委托对象
4.启动线程
5.在线程调用的方法里通过Control的Invoke方法执行委托
public Form1()
{
InitializeComponent();
//TextBox.CheckForIllegalCrossThreadCalls = false;//线程访问控件(不安全的方式)
dgShowMsgInTextBox = new DGShowMsgInTextBox(DoShowMsgInTextBox);
}
private void btnCount_Click(object sender, EventArgs e)
{
Count();
}
private void Count()//用UI计数(不另外开启线程)
{
DateTime beginTime = DateTime.Now;
for (int i = 0; i < 999999999; i++) { }
System.Threading.Thread.Sleep(3000);
DateTime endTime = DateTime.Now;
TimeSpan ts = endTime.Subtract(beginTime);
MessageBox.Show("计算完毕,总耗时:" + ts.TotalMilliseconds.ToString());
}
private void btnCountByThread_Click(object sender, EventArgs e)//用线程计数
{
//创建线程对象(传入委托对象),也可以直接传方法
Thread thread = new Thread(Count);
thread.Name = "t1";
//将线程标记为可以开始了
thread.Start();
}
private void button1_Click(object sender, EventArgs e)//不安全的访问控件
{
Thread threa = new Thread(CountAndShow);
threa.Start();
}
private void CountAndShow()//不安全的方式访问控件-需要设置TextBox.CheckForIllegalCrossThreadCalls = false
{
DateTime beginTime = DateTime.Now;
for (int i = 0; i < 10000000; i++)
{
txtNum.Text = i.ToString();
}
DateTime endTime = DateTime.Now;
TimeSpan ts = endTime.Subtract(beginTime);
MessageBox.Show("计算完毕,总耗时:" + ts.TotalMilliseconds.ToString());
}
private void CountAndShowSafety()//安全的访问UI线程上的控件
{
DateTime beginTime = DateTime.Now;//记录开始时间
for (int i = 0; i < 10000000; i++)
{
//调用Control类的Invoke方法 执行委托里的 方法
this.Invoke(dgShowMsgInTextBox, i.ToString());
}
DateTime endTime = DateTime.Now;//记录结束时间
TimeSpan ts = endTime.Subtract(beginTime);//计算时间差
MessageBox.Show("计算完毕,总耗时:" + ts.TotalMilliseconds.ToString());
}
{
InitializeComponent();
//TextBox.CheckForIllegalCrossThreadCalls = false;//线程访问控件(不安全的方式)
dgShowMsgInTextBox = new DGShowMsgInTextBox(DoShowMsgInTextBox);
}
private void btnCount_Click(object sender, EventArgs e)
{
Count();
}
private void Count()//用UI计数(不另外开启线程)
{
DateTime beginTime = DateTime.Now;
for (int i = 0; i < 999999999; i++) { }
System.Threading.Thread.Sleep(3000);
DateTime endTime = DateTime.Now;
TimeSpan ts = endTime.Subtract(beginTime);
MessageBox.Show("计算完毕,总耗时:" + ts.TotalMilliseconds.ToString());
}
private void btnCountByThread_Click(object sender, EventArgs e)//用线程计数
{
//创建线程对象(传入委托对象),也可以直接传方法
Thread thread = new Thread(Count);
thread.Name = "t1";
//将线程标记为可以开始了
thread.Start();
}
private void button1_Click(object sender, EventArgs e)//不安全的访问控件
{
Thread threa = new Thread(CountAndShow);
threa.Start();
}
private void CountAndShow()//不安全的方式访问控件-需要设置TextBox.CheckForIllegalCrossThreadCalls = false
{
DateTime beginTime = DateTime.Now;
for (int i = 0; i < 10000000; i++)
{
txtNum.Text = i.ToString();
}
DateTime endTime = DateTime.Now;
TimeSpan ts = endTime.Subtract(beginTime);
MessageBox.Show("计算完毕,总耗时:" + ts.TotalMilliseconds.ToString());
}
private void CountAndShowSafety()//安全的访问UI线程上的控件
{
DateTime beginTime = DateTime.Now;//记录开始时间
for (int i = 0; i < 10000000; i++)
{
//调用Control类的Invoke方法 执行委托里的 方法
this.Invoke(dgShowMsgInTextBox, i.ToString());
}
DateTime endTime = DateTime.Now;//记录结束时间
TimeSpan ts = endTime.Subtract(beginTime);//计算时间差
MessageBox.Show("计算完毕,总耗时:" + ts.TotalMilliseconds.ToString());
}