呵呵,很简单,先定义一个窗体变量;
如:frmDirTool() DirTool = null;
然后再从生成这个窗体的点击事件中写入
if(DirTool ==null)
{
DirTool = new frmDirTool();
DirTool.MdiParent = this;
DirTool.Show();
}
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