Need use base type property get method when the override property is internal

[huanwu]

When serialize the following derived type, it will throw “access method DerivedTypeWithDifferentOverrides.get_Name4() failed”. This is because the generated code is wrong and it try to access the internal Name4 property.

public class BaseType
{
    public virtual string Name1 { get; set; }
    public string Name2 { get; set; }
    public string Name3 { get; set; }
    public string Name4 { get; set; }
    public string @Name5 { get; set; }
}

public class DerivedTypeWithDifferentOverrides : BaseType
{
    public override string Name1 { get; set; }
    new public string Name2 { get; set; }
    new public string Name3 { get; set; }
    new internal string Name4 { get; set; }
    new public string Name5 { get; set; }
}