Question

我看到一些使用ComponentResourceKey的意外行为。问题出现了，因为我使用的是SystemColors类中使用的名称。

请考虑以下代码：

首先，我将一个ComponentResourceKey暴露在一个静态属性中：


public enum ColorKeys
{
    ControlColor
}

public class MyColors
{
    public static ComponentResourceKey ControlColorKey
    {
        get 
        { 
            return new ComponentResourceKey(typeof(MyColors), ColorKeys.ControlColor); 
        }
    }
}

使用标记中的密钥为该密钥分配资源。使用ComponentResourceKey标记将该资源作为DynamicResource调用有效。但是使用static属性调用相同的资源会解析为SystemColors.ControlColorKey资源。

这是xaml：

<Window.Resources>
    <Color x:Key="{x:Static l:MyColors.ControlColorKey}">#FF0000FF</Color>
    <SolidColorBrush x:Key="UsingVerbose" 
                     Color="{DynamicResource {ComponentResourceKey TypeInTargetAssembly={x:Type l:MyColors}, 
                                ResourceId={x:Static l:ColorKeys.ControlColor}}}"/>
    <SolidColorBrush x:Key="UsingStatic" 
                     Color="{DynamicResource {x:Static l:MyColors.ControlColorKey}}"/>                
</Window.Resources>
<Grid>
    <StackPanel>
        <Button Height="20" Width="80" Background="{DynamicResource UsingVerbose}" Content="Verbose"/>
        <Button Height="20" Width="80" Background="{DynamicResource UsingStatic}" Content="Static"/>
    </StackPanel>
</Grid>

显示窗口时，“详细”按钮会正确显示蓝色背景。但较低的“静态”按钮显示SystemColors.ControlColorKey颜色。

将静态属性的名称更改为其他名称会使两个画笔都解析为正确的颜色。

但是我不确定为什么DynamicResource对于密钥的静态实例以及由标记实例化的实例进行不同的解析？

谢谢，

ķ

PS：这是ResourceDictionarySource的相关跟踪输出

System.Windows.ResourceDictionary Start: 10 : New resource dictionary set; Owner='TestMergedDictionaries.Window1'; Owner.HashCode='64923656'; Owner.Type='TestMergedDictionaries.Window1'; OldDictionary='0'; NewDictionary='System.Windows.ResourceDictionary'; NewDictionary.HashCode='44624228'; NewDictionary.Type='System.Windows.ResourceDictionary'
System.Windows.ResourceDictionary Stop: 10 : 
System.Windows.ResourceDictionary Start: 12 : Deferred resource has been added to ResourceDictionary; Dictionary='System.Windows.ResourceDictionary'; Dictionary.HashCode='44624228'; Dictionary.Type='System.Windows.ResourceDictionary'; ResourceKey='TargetType=TestMergedDictionaries.MyColors ID=ControlColor'; ResourceKey.HashCode='1936592'; ResourceKey.Type='System.Windows.ComponentResourceKey'
System.Windows.ResourceDictionary Stop: 12 : 
System.Windows.ResourceDictionary Start: 12 : Deferred resource has been added to ResourceDictionary; Dictionary='System.Windows.ResourceDictionary'; Dictionary.HashCode='44624228'; Dictionary.Type='System.Windows.ResourceDictionary'; ResourceKey='UsingVerbose'
System.Windows.ResourceDictionary Stop: 12 : 
System.Windows.ResourceDictionary Start: 12 : Deferred resource has been added to ResourceDictionary; Dictionary='System.Windows.ResourceDictionary'; Dictionary.HashCode='44624228'; Dictionary.Type='System.Windows.ResourceDictionary'; ResourceKey='UsingStatic'
System.Windows.ResourceDictionary Stop: 12 : 
System.Windows.ResourceDictionary Start: 11 : Searching for resource; Element='System.Windows.Controls.Button'; Element.HashCode='52727599'; Element.Type='System.Windows.Controls.Button'; ResourceKey='UsingVerbose'
System.Windows.ResourceDictionary Start: 3 : Found resource item on an element; Element='TestMergedDictionaries.Window1'; Element.HashCode='64923656'; Element.Type='TestMergedDictionaries.Window1'; ResourceKey='UsingVerbose'; Value='System.Windows.DeferredResourceReference'; Value.HashCode='14347911'; Value.Type='System.Windows.DeferredResourceReference'
System.Windows.ResourceDictionary Stop: 3 : 
System.Windows.ResourceDictionary Stop: 11 : Searching for resource; Element='System.Windows.Controls.Button'; Element.HashCode='52727599'; Element.Type='System.Windows.Controls.Button'; ResourceKey='UsingVerbose'

... removed uninteresting traces ...

System.Windows.ResourceDictionary Start: 11 : Searching for resource; Element='TestMergedDictionaries.Window1'; Element.HashCode='64923656'; Element.Type='TestMergedDictionaries.Window1'; ResourceKey='TargetType=TestMergedDictionaries.MyColors ID=ControlColor'; ResourceKey.HashCode='1936592'; ResourceKey.Type='System.Windows.ComponentResourceKey'
System.Windows.ResourceDictionary Start: 3 : Found resource item on an element; Element='TestMergedDictionaries.Window1'; Element.HashCode='64923656'; Element.Type='TestMergedDictionaries.Window1'; ResourceKey='TargetType=TestMergedDictionaries.MyColors ID=ControlColor'; ResourceKey.HashCode='1936592'; ResourceKey.Type='System.Windows.ComponentResourceKey'; Value='System.Windows.DeferredResourceReference'; Value.HashCode='23488915'; Value.Type='System.Windows.DeferredResourceReference'
System.Windows.ResourceDictionary Stop: 3 : 
System.Windows.ResourceDictionary Stop: 11 : Searching for resource; Element='TestMergedDictionaries.Window1'; Element.HashCode='64923656'; Element.Type='TestMergedDictionaries.Window1'; ResourceKey='TargetType=TestMergedDictionaries.MyColors ID=ControlColor'; ResourceKey.HashCode='1936592'; ResourceKey.Type='System.Windows.ComponentResourceKey'

System.Windows.ResourceDictionary Start: 2 : Delayed creation of resource; Dictionary='System.Windows.ResourceDictionary'; Dictionary.HashCode='23264094'; Dictionary.Type='System.Windows.ResourceDictionary'; ResourceKey='System.Windows.Controls.TextBlock'; Value='DefAttributeKeyType typeId=TextBlock'; Value.HashCode='23521433'; Value.Type='System.Windows.Markup.BamlDefAttributeKeyTypeRecord'
System.Windows.ResourceDictionary Stop: 2 : Delayed creation of resource; Dictionary='System.Windows.ResourceDictionary'; Dictionary.HashCode='23264094'; Dictionary.Type='System.Windows.ResourceDictionary'; ResourceKey='System.Windows.Controls.TextBlock'; Value='System.Windows.Style'; Value.HashCode='5'; Value.Type='System.Windows.Style'

System.Windows.ResourceDictionary Start: 2 : Delayed creation of resource; Dictionary='System.Windows.ResourceDictionary'; Dictionary.HashCode='44624228'; Dictionary.Type='System.Windows.ResourceDictionary'; ResourceKey='UsingStatic'; Value='DefAttributeKeyString'; Value.HashCode='24854661'; Value.Type='System.Windows.Markup.BamlDefAttributeKeyStringRecord'
System.Windows.ResourceDictionary Start: 11 : Searching for resource; Element=''; ResourceKey='ControlColor'; ResourceKey.HashCode='35'; ResourceKey.Type='System.Windows.SystemResourceKey'
System.Windows.ResourceDictionary Start: 8 : Found resource item in theme; Dictionary='System.Windows.SystemResourceHost'; Dictionary.HashCode='65273341'; Dictionary.Type='System.Windows.SystemResourceHost'; ResourceKey='ControlColor'; ResourceKey.HashCode='35'; ResourceKey.Type='System.Windows.SystemResourceKey'; Value='#FFF0F0F0'
System.Windows.ResourceDictionary Stop: 8 : 
System.Windows.ResourceDictionary Stop: 11 : Searching for resource; Element=''; ResourceKey='ControlColor'; ResourceKey.HashCode='35'; ResourceKey.Type='System.Windows.SystemResourceKey'
System.Windows.ResourceDictionary Stop: 2 : Delayed creation of resource; Dictionary='System.Windows.ResourceDictionary'; Dictionary.HashCode='44624228'; Dictionary.Type='System.Windows.ResourceDictionary'; ResourceKey='UsingStatic'; Value='#FFF0F0F0'; Value.HashCode='12408161'; Value.Type='System.Windows.Media.SolidColorBrush'

System.Windows.ResourceDictionary Start: 11 : Searching for resource; Element='TestMergedDictionaries.Window1'; Element.HashCode='64923656'; Element.Type='TestMergedDictionaries.Window1'; ResourceKey='ControlColor'; ResourceKey.HashCode='35'; ResourceKey.Type='System.Windows.SystemResourceKey'
System.Windows.ResourceDictionary Start: 8 : Found resource item in theme; Dictionary='System.Windows.SystemResourceHost'; Dictionary.HashCode='65273341'; Dictionary.Type='System.Windows.SystemResourceHost'; ResourceKey='ControlColor'; ResourceKey.HashCode='35'; ResourceKey.Type='System.Windows.SystemResourceKey'; Value='#FFF0F0F0'
System.Windows.ResourceDictionary Stop: 8 : 
System.Windows.ResourceDictionary Stop: 11 : Searching for resource; Element='TestMergedDictionaries.Window1'; Element.HashCode='64923656'; Element.Type='TestMergedDictionaries.Window1'; ResourceKey='ControlColor'; ResourceKey.HashCode='35'; ResourceKey.Type='System.Windows.SystemResourceKey'

System.Windows.ResourceDictionary Start: 2 : Delayed creation of resource; Dictionary='System.Windows.ResourceDictionary'; Dictionary.HashCode='44624228'; Dictionary.Type='System.Windows.ResourceDictionary'; ResourceKey='TargetType=TestMergedDictionaries.MyColors ID=ControlColor'; ResourceKey.HashCode='1936592'; ResourceKey.Type='System.Windows.ComponentResourceKey'; Value='KeyElementStart typeId=StaticExtension'; Value.HashCode='54371668'; Value.Type='System.Windows.Markup.BamlKeyElementStartRecord'
System.Windows.ResourceDictionary Stop: 2 : Delayed creation of resource; Dictionary='System.Windows.ResourceDictionary'; Dictionary.HashCode='44624228'; Dictionary.Type='System.Windows.ResourceDictionary'; ResourceKey='TargetType=TestMergedDictionaries.MyColors ID=ControlColor'; ResourceKey.HashCode='1936592'; ResourceKey.Type='System.Windows.ComponentResourceKey'; Value='#FF0000FF'

Answer 1

在静态ControlColorKey中，每次访问getter时都在创建ComponentResourceKey的新实例。因此，第二种用法引用了一个不同的对象，并且没有获得更新的颜色。如果将代码更改为简单的静态字段，则可以按预期工作：

public static ComponentResourceKey ControlColorKey = new ComponentResourceKey(typeof(MyColors), ColorKeys.ControlColor);

ComponentResourceKey为DynamicResource问题

1 个答案: