// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
/***************************************************************************\
*
*
* Base class for various types of key objects to use in resource dictionaries.
*
*
\***************************************************************************/
using System.Reflection;
using System.Windows.Markup;
 
namespace System.Windows
{
    /// <summary>
    ///     Abstract base class for various resource keys.
    ///     Provides a common base for simple key detection in resource components.
    /// </summary>
    [MarkupExtensionReturnType(typeof(ResourceKey))]
    public abstract class ResourceKey : MarkupExtension
    {
        /// <summary>
        ///     Used to determine where to look for the resource dictionary that holds this resource.
        /// </summary>
        public abstract Assembly Assembly
        {
            get;
        }
 
        /// <summary>
        ///  Return this object.  ResourceKeys are typically used as a key in a dictionary.
        /// </summary>
        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return this;
        }
    }
}