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/***************************************************************************\
*
* File: DynamicResourceExtension.cs
*
* Class for Xaml markup extension for static resource references.
*
* Copyright (C) 2004 by Microsoft Corporation. All rights reserved.
*
\***************************************************************************/
using System;
using System.ComponentModel;
using System.Windows;
using System.Windows.Markup;
using System.Reflection;
using MS.Internal; // Helper
namespace System.Windows
{
/// <summary>
/// Class for Xaml markup extension for static resource references.
/// </summary>
[TypeConverter(typeof(DynamicResourceExtensionConverter))]
[MarkupExtensionReturnType(typeof(object))]
public class DynamicResourceExtension : MarkupExtension
{
/// <summary>
/// Constructor that takes no parameters
/// </summary>
public DynamicResourceExtension()
{
}
/// <summary>
/// Constructor that takes the resource key that this is a static reference to.
/// </summary>
public DynamicResourceExtension(
object resourceKey)
{
if (resourceKey == null)
{
throw new ArgumentNullException("resourceKey");
}
_resourceKey = resourceKey;
}
/// <summary>
/// Return an object that should be set on the targetObject's targetProperty
/// for this markup extension. For DynamicResourceExtension, this is the object found in
/// a resource dictionary in the current parent chain that is keyed by ResourceKey
/// </summary>
/// <returns>
/// The object to set on this property.
/// </returns>
public override object ProvideValue(IServiceProvider serviceProvider)
{
if (ResourceKey == null)
{
throw new InvalidOperationException(SR.Get(SRID.MarkupExtensionResourceKey));
}
if (serviceProvider != null)
{
// DynamicResourceExtensions are not allowed On CLR props except for Setter,Trigger,Condition (bugs 1183373,1572537)
DependencyObject targetDependencyObject;
DependencyProperty targetDependencyProperty;
Helper.CheckCanReceiveMarkupExtension(this, serviceProvider, out targetDependencyObject, out targetDependencyProperty);
}
return new ResourceReferenceExpression(ResourceKey);
}
/// <summary>
/// The key in a Resource Dictionary used to find the object refered to by this
/// Markup Extension.
/// </summary>
[ConstructorArgument("resourceKey")] // Uses an instance descriptor
public object ResourceKey
{
get { return _resourceKey; }
set
{
if (value == null)
{
throw new ArgumentNullException("value");
}
_resourceKey = value;
}
}
private object _resourceKey;
}
}
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