为什么我不能从代码中设置SolidColorBrush资源值？

Question

我在我的xaml中定义了一个资源:

<core:WidgetBase xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"  x:Class="....Silverlight.LiquidityConstraintsView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:core="clr-namespace:...Silverlight;assembly=....Silverlight"
    xmlns:local="clr-namespace:....Silverlight"
    mc:Ignorable="d">

    <core:WidgetBase.Resources>
        <SolidColorBrush x:Key="..." />
    </core:WidgetBase.Resources>
...

我试图从代码中设置它:

void _administrationClient_GetByFilterModuleSettingCompleted(object sender, GetByFilterModuleSettingCompletedEventArgs e)
{
        this.Resources["..."] = new SolidColorBrush(Colors.Red);
}

但我得到错误:

该方法或操作未实现.

堆栈跟踪 :

   at System.Windows.ResourceDictionary.set_Item(Object key, Object value)
   at ....Silverlight.LiquidityConstraintsView._administrationClient_GetByFilterModuleSettingCompleted(Object sender, GetByFilterModuleSettingCompletedEventArgs e)
   at ....Service.AdministrationServiceClient.OnGetByFilterModuleSettingCompleted(Object state)

当我向服务器发送请求以获取颜色时会发生这种情况,然后当它返回时我尝试将该颜色设置为资源,即使我尝试在此时将其设置为红色也会失败.

如果它有帮助,我设置它的方法是从WCF调用到服务器的异步回调方法.

Answer 1

如果你看一下ResourceDictionaryReflector(对于Silverlight)的setter ,你会看到它抛出一个NotImplementedException,所以这在Silverlight中不起作用.

您可以尝试删除资源并重新添加它,但这是在黑暗中拍摄的.