为什么它返回空当我试图调用泛型方法

我一直在尝试执行泛型方法并使用递归。问题是方法GetMethod返回null。我如何改进代码?

public static T GetElementObject<T>(this XElement element)
{
    T returnObject = Activator.CreateInstance<T>();
    PropertyInfo[] propertyInfos = returnObject.GetType().GetProperties();
    Type propertyType;
    foreach (PropertyInfo propertyInfo in propertyInfos)
    {
        propertyType = propertyInfo.PropertyType;
        if (propertyType.IsAssignableFrom(typeof(BaseProxyEntity)))
        {
            MethodInfo getElementObject = typeof(Utility).GetMethod("GetElementObject<>", System.Reflection.BindingFlags.Static | BindingFlags.Public).MakeGenericMethod(propertyType);
            propertyInfo.SetValue(returnObject, getElementObject.Invoke(null, new object[] { element.Descendants(propertyInfo.Name) }), null);
        }
        else if (propertyType.IsValueType == true)
        {
            MethodInfo CastValue = typeof(Utility).GetMethod("CastValue<>", System.Reflection.BindingFlags.Static | BindingFlags.Public).MakeGenericMethod(propertyType);
            propertyInfo.SetValue(returnObject, CastValue.Invoke(null, new object[] { element.Attribute(propertyInfo.Name).Value }), null);
        }
        //Other else conditions ...
    }
    return returnObject;
}