Get only protected members via .net reflection

Question

This returns all non-public instance properties:

var instanceNonPublic = currentType.GetProperties (BindingFlags.Instance |
                                                   BindingFlags.NonPublic);

But is there any way to determine which access modifier applies to each property? private, internal or protected?

Answer 1

Since properties are made of get method and set method you can iterate them and filter the relevant PropertyInfos using their get and set methods' access modifiers:

var instancePrivate = currentType.GetProperties(BindingFlags.Instance | 
                                                 BindingFlags.NonPublic)
    .Where(x => x.GetMethod.IsPrivate &&
                x.SetMethod.IsPrivate);

Those are the interesting access modifiers:

• IsPrivate indicates that the method is private.
• IsFamily indicates that the method is protected.
• IsAssembly indicates that the method is internal.

Other way to elegantly set the filter is using FindMembers:

public void YourMethod()
{
    ...
    var instancePrivate = currentType.FindMembers(MemberTypes.Property,
                                                  BindingFlags.Instance |
                                                  BindingFlags.NonPublic,
                                                  PrivateMemberFilter, null);
        .OfType<PropertyInfo>();
    ...
}

static readonly MemberFilter PrivatePropertyFilter = (objMemberInfo, objSearch) =>
{
    PropertyInfo info = (objMemberInfo as PropertyInfo);
    if (info == null)
    {
        return false;
    }
    return info.GetMethod.IsPrivate && info.SetMethod.IsPrivate;
};