我怎样才能得到我想要的类型?

有 a lot 稍微改变就可以了

public class MyEntity
{
   public long ID { get; set; }
   public string Name { get; set; }
   public decimal Salary { get; set; }
   public static GetMyEntity ( long ID )
   {
      MyEntity e = new MyEntity();
      // load data from DB and bind to this instance
      return e;
   } 
}

出于某些原因,现在我需要这样做:

Type t = Type.GetType("XXX"); // XXX is one of the above classes' name
MethodInfo staticM= t.GetMethods(BindingFlags.Public | BindingFlags.Static).FirstOrDefault();// I'm sure I can get the correct one
var o = staticM.Invoke(...); //returns a object, but I want the type above!

如果我一开始通过了“我的实体”,我希望我能得到o作为我的实体! 请注意 我只知道“班名”。 MyEntity e = staticM.Invoke(...) as MyEntity; 这里不能用。

编辑

我试着用表达式来解决它。

ParameterExpression[] parameterExps = (from p in staticM.GetParameters()
                   select Expression.Parameter(p.ParameterType, p.Name)).ToArray();
MethodCallExpression methodCallExp = Expression.Call(staticM, parameterExps);
BlockExpression blockExpression = Expression.Block(methodCallExp);
LambdaExpression lambdaExp = Expression.Lambda(blockExpression, parameterExps);
var d = lambdaExp.Compile() as Func<XX1,XX2>;

在示例MyEntity中,XX1将是长的,XX2将是MyEntity,但是如何编写它以适合其他情况?