WINFORM如何只弹出一个子窗体
public partial class Form1:Form { Form2 f=null; public Form1() { InitializeComponent(); } private void Form1_Click(object sender, EventArg e) { if(f==null||f.IsDisposed) //注意先判断null,再判断IsDisposed,不能先判断IsDisposed { f=new Form2(); f.Show(); } else { f.Show(); } } } |