Creating functions to retrieve values of properties retrieved via reflection

Im writing code to transfer data of my ORM entities into a dataset. Because i dont want to write special code for each type defining which properties need to be written down, i am currently using reflection (calling GetProperties on the type of the entities, building up a DataTable for this type and then calling GetValue on each Propertyinfo for each entity). Status quo: It works, but it is slow.

Now i´m trying to build up a method that is returning a function to retrieve the value of certain properties fast, but i am having a hard time here. This is what i got so far:

  /// <summary>
  /// creates a func that will return the value of the given property 
  /// </summary>
  /// <typeparam name="T">type of the entity</typeparam>
  /// <param name="propertyInfo">the property to get the value from</param>
  /// <returns>a function accepting an instance of T and returning the value of the property</returns>
  private Func<T, object> CreateGetPropertyFunc<T>(PropertyInfo propertyInfo)
   {         
     MethodInfo getMethod = propertyInfo.GetGetMethod();
     return (Func<T, object>)Delegate.CreateDelegate(typeof(Func<T, object>), getMethod);          
  }

This is my unit test:

  [TestMethod]
  public void TestGenerateDelegate()
  {
     var employee = new Employee
     {            
        Id = 1,
        Name = "TestEmployee",            
     };

     Func<Employee, object> getIdValueFunc = CreateGetPropertyFunc<Employee>(typeof(Employee).GetProperty("Id"));
     Assert.AreEqual(1, getIdValueFunc(employee));
  }

When i call it, an ArgumentException with the message "Exception while binding to the target method" (translated, may be different text) is thrown .

I´m pretty sure i´m not correctly handling that CreateDelegate method. Could anyone point me to the right direction, please?