CODEWITHSUNDEEP
c#.netreflection
RBA
RBA

Reputation: 12584

Get all static properties from a class

I know that there are many questions like this, but I couldn't find any answer to what I'm trying to do.

Considering the following abstract class:

public abstract class TestBase
{
    public static ITest Test => Container.Resolve<ITest>();
    public static ITest1 Test1 => Container.Resolve<ITest1>();
    public static ITest2 Test2 => Container.Resolve<ITest2>();
    public static ITest3 Test3 => Container.Resolve<ITest3>();
}

I'm trying to get all the properties that inherit from an interface IDummy like this:

    var members = typeof(TestBase).GetMembers(BindingFlags.Static | BindingFlags.Public)
        .Where(f => f.GetType().IsAssignableFrom(typeof(IDummy)) == true);

but the list is empty. Without adding the where clause ".Where(f => f.GetType().IsAssignableFrom(typeof(IDummy)) == true)" I get all the results including the getters for the properties.

Probably is something trivial, but as I'm not so familiar with reflection I can't figure out what I'm doing wrong.

Upvotes: 3

Views: 2138

Answers (1)

O. R. Mapper
O. R. Mapper

Reputation: 20770

What you get back from GetMembers is MemberInfo instances (or, for fields, FieldInfo instances). Hence, you cannot check these objects directly for being assignable from IDummy.

What you actually want to do is filter the MemberInfo objects for fields, then check the FieldType property of each of these objects:

var members = typeof(TestBase).GetMembers(BindingFlags.Static | BindingFlags.Public)
    .OfType<FieldInfo>()
    .Where(f => typeof(IDummy).IsAssignableFrom(f.FieldType));

Also, note that I turned around the subject and object of the IsAssignableFrom call, as also suggested in Patrick's comment.

As I just noticed, your example seems to show properties rather than fields. The general technique is the same, though; just use PropertyInfo and PropertyType rather than FieldInfo and FieldType, respectively.

Lastly, rather than filtering for PropertyInfo yourself, you could also use the one of the overloads of the GetProperties method directly.

Upvotes: 7

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