新建一Window Form,命名为 Form1, 上面放置 button1,和 button2,
定义button1的Click事件为
private void button1_Click(object sender, EventArgs e)
{
object control = button2;
Type controltype = control.GetType();
EventInfo clickEvent = controltype.GetEvent("Click");
Type[] types = clickEvent.EventHandlerType.GetMethod("Invoke").GetParameters().Select(n => n.ParameterType).ToArray<Type>();
DynamicMethod method = new DynamicMethod("", null,types,controltype);
ILGenerator generator = method.GetILGenerator();
MethodInfo runmethod = typeof(MessageBox).GetMethod("Show", new Type[] { typeof(string) });
generator.Emit(OpCodes.Nop);
generator.Emit(OpCodes.Ldstr, "This is the Message needed to show!");
generator.Emit(OpCodes.Call, runmethod);
generator.Emit(OpCodes.Nop);
generator.Emit(OpCodes.Ret);
//
Delegate del = method.CreateDelegate(clickEvent.EventHandlerType);
clickEvent.GetAddMethod().Invoke(control, new object[] { del });
}
这样点击完button1后，点击button2，就会弹出 MessageBox
可是如果改为如下代码，就会运行错误。还请各位多多指教。
private void button1_Click(object sender, EventArgs e)
{
object control = button2;
Type controltype = control.GetType();
EventInfo clickEvent = controltype.GetEvent("Click");
Type[] types = clickEvent.EventHandlerType.GetMethod("Invoke").GetParameters().Select(n => n.ParameterType).ToArray<Type>();
DynamicMethod method = new DynamicMethod("", null,types,controltype);
ILGenerator generator = method.GetILGenerator();
MethodInfo runmethod = this.GetType().GetMethod("ShowMessage", BindingFlags.Instance | BindingFlags.NonPublic);
//runmethod = typeof(MessageBox).GetMethod("Show", new Type[] { typeof(string) });
generator.Emit(OpCodes.Nop);
generator.Emit(OpCodes.Ldstr, "This is the Message needed to show!");
generator.Emit(OpCodes.Call, runmethod);
generator.Emit(OpCodes.Nop);
generator.Emit(OpCodes.Ret);
//
Delegate del = method.CreateDelegate(clickEvent.EventHandlerType);
clickEvent.GetAddMethod().Invoke(control, new object[] { del });
}
void ShowMessage(string msg)
{
MessageBox.Show(msg, "");
}
