How can I get all types with a custom attribute

Question

I'm trying to get all types with the code below based on these topics:

• Get Method Details using reflection and decorated attribute
• Creating Custom Attributes (C# and Visual Basic)

So I have this attribute:

public class DataLayerInterfaceAttribute   : System.Attribute
{
    public DataLayerInterfaceAttribute() { }
}

And I have this interface:

[DataLayerInterfaceAttribute]
interface IInterface
{
    void Method(string param);
}

Finally I want to get the interface type:

var types = from type in assembly.GetTypes()
            where Attribute.IsDefined(type, typeof(DataLayerInterfaceAttribute))
            select type;

I already tested with this:

var types = from type in assembly.GetTypes()
            where type.GetCustomAttributes(type,true).Length > 0
            select type;

But the result for both is empty and I dont know why.

EDIT

I'm getting the assembly like this:

string assemblyName = System.Reflection.Assembly.GetExecutingAssembly().Location;
byte[] assemblyBytes = File.ReadAllBytes(assemblyName);
Assembly assembly = Assembly.Load(assemblyBytes);