Interface member's attributes

[Mr Candyman]

Hello I was just wondering how do attributes in interface's members work. I mean, if I put an attribute in a property, for example: [BindableAttribute()] int PropertyName { get; set;} Will it propagate the attribute through inheritance without having to type again the attribute when implementing the interface code? thanks in advance.

[John Gathogo]

You will also need to implement the properties when implementing the interfaces like:

    protected string m\_PropertyName;

    public string PropertyName
    {
        get
        {
            return m\_PropertyName;
        }
        internal set
        {
            m\_PropertyName = value;
        }
    }

So, it is expected that you will implement the get and set in derived classes

[Mr Candyman]

Thanks but I do know that I need to implement the properties accessors code, what I wanted to learn is whether I have to explicitly implement the attribute too(the BindableAttribute in this case) each time again even if I put it in the interface.

[John Gathogo]

Sorry for the misunderstanding Mr. Candyman. Am not exactly sure whether you have to still implement the attribute too.

[J4amieC]

Have you tried it? It would seem this is very easy to confirm with a 5 minute test-app.

[J4amieC]

Here you go, A simple test app.

class Program
{
static void Main(string[] args)
{
ExecTest(typeof(ITest));
ExecTest(typeof(Test));
Console.ReadLine();
}

static void ExecTest(Type type)
{
    PropertyInfo prop = type.GetProperty("PropertyName");
    if (prop == null)
        throw new InvalidOperationException("invalid type - must have PropertyName property");
    object\[\] attrs = prop.GetCustomAttributes(typeof(DefaultSettingValueAttribute), true);
    Console.WriteLine("Number of DefaultSettingValueAttribute's on '{1}': {0}", attrs.Length,type.Name);
}


public class Test : ITest
{
    #region ITest Members

    public string PropertyName
    {
        get
        {
            throw new NotImplementedException();
        }
        set
        {
            throw new NotImplementedException();
        }
    }

    #endregion
}

public interface ITest
{
    \[DefaultSettingValue("test")\]
    string PropertyName { get; set; }
}

}