定义有参数的线程实现计算圆面积

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

int banjing = Convert.ToInt32(this.textBox1.Text);

//定义有参数的线程

ParameterizedThreadStart pts = new ParameterizedThreadStart(jisuan);

Thread t = new Thread(pts);

t.Start(banjing);//这里给参数赋值

}

//定义给计算面积的方法

private void jisuan(object r)

{

int r1=Convert.ToInt32(r);

string mianji = (Math.PI * r1 * r1).ToString();

MessageBox.Show(mianji);

}

}