动态加载dll

/// <summary>
/// 动态加载dll
/// 反射
/// </summary>
private void dynamicDll()
{
string dllName = "dll";
Assembly ass = Assembly.Load(dllName); //加载dll文件
dllName = dllName + "." + "frmMain";
Type[] tt= ass.GetTypes();
Type tp = ass.GetType(dllName); //获取类名，必须 命名空间+类名
// Object obj = Activator.CreateInstance(tp); //建立实例
Form obj = (Form)Activator.CreateInstance(tp); //建立实例
// MethodInfo meth = tp.GetMethod("add"); //获取方法
// int t = Convert.ToInt32(meth.Invoke(obj, new Object[] { 2, 3 })); //Invoke调用方法
obj.ShowDialog();
// MessageBox.Show(t.ToString());
}