Unity3D - PropertyAttribute - OnChanged Call a method (basic)

OnChangedCallAttribute.cs

using System.Linq;
using UnityEngine;
using UnityEditor;
using System.Reflection;

/// Feel free to us this. :)

public class OnChangedCallAttribute : PropertyAttribute
{
    public string methodName;
    public OnChangedCallAttribute(string methodNameNoArguments)
    {
        methodName = methodNameNoArguments;
    }
}

#if UNITY_EDITOR

[CustomPropertyDrawer(typeof(OnChangedCallAttribute))]
public class OnChangedCallAttributePropertyDrawer : PropertyDrawer
{
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        EditorGUI.BeginChangeCheck();
        EditorGUI.PropertyField(position, property);
        if(EditorGUI.EndChangeCheck())
        {
            OnChangedCallAttribute at = attribute as OnChangedCallAttribute;
            MethodInfo method = property.serializedObject.targetObject.GetType().GetMethods().Where(m => m.Name == at.methodName).First();

            if (method != null && method.GetParameters().Count() == 0)// Only instantiate methods with 0 parameters
                method.Invoke(property.serializedObject.targetObject, null);
        }
    }
}

#endif

SimpleOnChangedCallTester.cs

using UnityEngine;

public class SimpleOnChangedCallTester : MonoBehaviour
{
    [OnChangedCall("ImChanged")]
    public int TestMeForChanges = 0;


    public void ImChanged()
    {
        Debug.Log("I have changed to" + TestMeForChanges);
    }
}