Winform 线程中修改控件属性.时钟示例

if(this.InvokeRequired)//InvokeRequired 属性可以判断是否有必要执行
this.Invoke(FlushClient);//FlushClient 委托另一个定义的方法 ThreadFunction 修改窗体控件属性

namespace WindowsFormsApplication2
{
public partial class Form1 : Form
{
Font shengFont = new Font("宋体", 12);
Font consolasFont = new Font("Consolas", 12);

Thread th;
public Form1()
{
InitializeComponent();

button3.Text = "停";

th = new Thread(new ThreadStart(MyWatch));
th.Start();

}

bool run = true;
private void MyWatch()
{
while (run)
{
//如果在线程中像下面这样修改控件属性，会收到错误提示信息。
//this.label1.Text = DateTime.Now.ToLongDateString() + "\n" + DateTime.Now.ToLongTimeString();
UpdataText(DateTime.Now.ToLongDateString() + "\n" + DateTime.Now.ToLongTimeString());
Thread.Sleep(100);
}

}

private delegate void TextDelegate(string timeText);//定义委托
private void UpdataText(string timeText)
{
if (label1.InvokeRequired)
{
TextDelegate tdege = delegate (string s)
{//使用委托
label1.Text = s;
};

label1.Invoke(tdege, timeText);
}
}

private void button1_Click(object sender, EventArgs e)
{
label1.Font = shengFont;
}

private void button2_Click(object sender, EventArgs e)
{
label1.Font = consolasFont;
}

private void button3_Click(object sender, EventArgs e)
{
if (run)
{
th.Abort();
run = false;
Thread.Sleep(100);
button3.Text = "开";
}else
{
run = true;
th = new Thread(new ThreadStart(MyWatch));
th.Start();
button3.Text = "停";
}
}
}
}