private void 打开子窗体ToolStripMenuItem_Click(object sender, EventArgs e)
{
Form2 f = new Form2();
f.MdiParent = this; //设置此窗体的当前多文档界面 (MDI) 父窗体
f.Show();//显示子窗体
f.Resize += new EventHandler(Resize);//用户使用鼠标来调整窗口边框跳转到下一个可用大小自动调整方式。
//当f发生Resize事件时,就会调用(f_Resize)方法;
}
public void Resize(object sender, EventArgs e)
{
Form2 f = (Form2)sender;
ToolStripMenuItem item = new ToolStripMenuItem();
for (int i = 0; i < f.contextMenuStrip2.Items.Count; )//合并菜单
{
item.DropDownItems.Add(f.contextMenuStrip2.Items[i]);
}
this.contextMenuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] { item });
}
报警告:
请问为什么会出现警告呢?怎么改正呢?谢谢各位高手!