usercontrols:里面写法如下:
public delegate void ButtonClickHandler();
public event ButtonClickHandler ButtonClick;
form1里面定义时间:
this.usercontrols.ButtonClick += new UserControl.UserMngControls.UserLogin.ButtonClickHandler(this.usercontrols _ButtonClick);
private void userLogin1_ButtonClick()
{
MessageBox.Show(this.userLogin1.MReturn.ToString());
}