在 ResourceDictionary 中交换 DynamicResource
Swap DynamicResource in ResourceDictionary
我有一个包含许多 ResourceDictionaries 的 MVVM 项目。我已经可以为颜色资源设置动画并动态更改画笔。更新作品。不幸的是，“重新链接” DynamicResource 不起作用。
我的目标是通过代码将资源“IPC”中的 Brush="{DynamicResource Process4}" 交换为 Brush="{DynamicResource Process6}"。解决方案必须是动态的。最好的方法是直接绑定到我的 ViewModel 的 属性。
我已经在 IPC 中尝试过 Brush="{DynamicResource Processes}"，但是更新 ProcessesMask 属性 并没有更新 IPC。
public class ViewModel : ViewModelBase
{
private Brush _ProcessesMask = GetAppResObject<DrawingBrush>("Process9");
public Brush ProcessesMask
{
get
{
return _ProcessesMask;
}
set
{
_ProcessesMask = Value;
PropertyChanged("ProcessesMask");
}
}
private T GetAppResObject<T>(string resourceKey)
{
try
{
object value = Windows.Application.Current.FindResource(resourceKey);
if (value is T)
return (T)value;
else
return default(T);
}
catch (Exception ex)
{
Logger.Append($"{typeof(T).Name} not found in the resources: {resourceKey}");
return default(T);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen00"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen01"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen02"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen10"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen11"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen12"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen20"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen21"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen22"></SolidColorBrush>
<DrawingBrush x:Key="Processes" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="{Binding ViewModel.ProcessesMask, UpdateSourceTrigger=PropertyChanged}" Geometry="F1 M 0.220913,0.220886L 164.221,0.220886L 164.221,104.221L 0.220913,104.221L 0.220913,0.220886 Z "/>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="Process4" Stretch="Uniform" >
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="{DynamicResource Screen00}" Geometry="F1 M 2.6668,-3.8147e-005L 75.3332,-3.8147e-005C 76.806,-3.8147e-005 78,1.19395 78,2.66677L 78,45.3332C 78,46.806 76.806,48 75.3332,48L 2.6668,48C 1.19397,48 -6.70045e-006,46.806 -6.70045e-006,45.3332L -6.70045e-006,2.66677C -6.70045e-006,1.19395 1.19397,-3.8147e-005 2.6668,-3.8147e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.206964" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
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<GeometryDrawing.Pen>
<Pen Thickness="0.206829" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
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<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
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<GeometryDrawing.Pen>
<Pen Thickness="0.207383" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="Process6" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
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<GeometryDrawing.Pen>
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</GeometryDrawing.Pen>
</GeometryDrawing>
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<GeometryDrawing.Pen>
<Pen Thickness="0.204468" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen02}" Geometry="F1 M 2.66676,56.0001L 47.3332,56.0001C 48.806,56.0001 50,57.1941 50,58.6669L 50,101.333C 50,102.806 48.806,104 47.3332,104L 2.66676,104C 1.19393,104 -3.62374e-005,102.806 -3.62374e-005,101.333L -3.62374e-005,58.6669C -3.62374e-005,57.1941 1.19393,56.0001 2.66676,56.0001 Z ">
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</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="Process9" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
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<GeometryDrawing.Pen>
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</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen01}" Geometry="F1 M 2.66678,36L 47.3332,36C 48.806,36 50,37.1939 50,38.6668L 50,65.3331C 50,66.806 48.806,68 47.3332,68L 2.66678,68C 1.19395,68 -1.81472e-005,66.806 -1.81472e-005,65.3331L -1.81472e-005,38.6668C -1.81472e-005,37.1939 1.19395,36 2.66678,36 Z ">
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</DrawingBrush>
</ResourceDictionary>
您绝对不想在视图模型中管理视图资源。而且您不想更改引用密钥本身：这意味着您必须重建所有 elements/XAML 才能更新引用的资源密钥。
您想要使用相同的资源密钥，例如DynamicBrushKey 并更改资源，例如它引用的 Color。
如果您可以直接访问定义资源的 ResourceDictionary，例如通过拥有元素或 MergedDictionary，您可以冻结它们以提高性能。您还可以使用 StaticResource 引用 Color 资源，这进一步提高了性能。
由于您必须在代码隐藏中处理资源键，我建议创建静态资源键以避免魔术字符串。这也简化了重构。这些静态键可以在任何 class.
中定义
MainWindow.xaml.cs
partial class MainWindow : Window
{
public static ResourceKey DynamicBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "DynamicBackgroundBrush");
public static ResourceKey BlueColorResourceKey { get; } = new ComponentResourceKey(typeof(MainWindow), "BlueColorResource");
public static ResourceKey RedColorResourceKey { get; } = new ComponentResourceKey(typeof(MainWindow), "RedColorResource");
private void AddResourcesDynamically()
{
// Get the ResourceDictionary or dictionaries that should define the resources
ResourceDictionary resources = Application.Current.Resources;
resources[<new_key>] = Colors.Green;
}
private void ChangeAndFreezeDynamicResourcesOfKnownResourceDictionay()
{
// Get the ResourceDictionary or dictionaries that define the resources
ResourceDictionary resources = Application.Current.Resources.Contains(MainWindow.DynamicBrushKey)
? Application.Current.Resources
: Application.Current.Resources.MergedDictionaries.First(resources => resources.Contains(MainWindow.DynamicBrushKey));
var dynamicBrush = resources[MainWindow.DynamicBrushKey] as SolidColorBrush;
var newColor = (Color)resources[MainWindow.BlueColorResourceKey];
if (dynamicBrush.IsFrozen)
{
dynamicBrush = dynamicBrush.Clone();
}
dynamicBrush.Color = newColor;
dynamicBrush.Freeze();
resources[MainWindow.DynamicBrushKey] = dynamicBrush;
}
// Resource should not be frozen i.e. referenced using DynamicResource
private void ChangeDynamicResourcesOfUnknownResourceDictionay()
{
var dynamicBrush = FindResource(MainWindow.DynamicBrushKey) as SolidColorBrush;
if (dynamicBrush.IsFrozen)
{
return;
}
var newColor = (Color)FindResource(MainWindow.BlueColorResourceKey);
dynamicBrush.Color = newColor;
}
}
MainWindow.xaml
<Window>
<Rectangle Fill="{DynamicResource {x:Static local:MainWindow.DynamicBrushKey}}"
Height="100" Width="100" />
</Window>
Colors.xaml
<ResourceDictionary>
<Color x:Key="{x:Static local:MainWindow.RedColorResourceKey}">Red</Color>
<Color x:Key="{x:Static local:MainWindow.BlueColorResourceKey}">Blue</Color>
<!-- The dynamic Brush resource -->
<SolidColorBrush x:Key="{x:Static local:MainWindow.DynamicBrushKey}" Color="{StaticResource {x:Static local:MainWindow.RedColorResourceKey}}" />
</ResourceDictionary>
App.xaml
<Application>
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Colors.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
问题更具体的例子
public static ResourceKey IpcBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "IpcBrush");
public static ResourceKey ProcessBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "ProcessBrush");
public static ResourceKey Process4ResourceBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "Process4Brush");
public static ResourceKey Process6ResourceBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "Process6Brush");
App.xaml
<Application>
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Colors.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
Colors.xaml
强烈建议将 ProcessX 笔刷内的笔刷引用为 StaticResource。它们不会更改并引用它们，因为 StaticResource 允许它们在添加到 ResourceDictionary 时被冻结。这提高了性能。总是首选 StaticResource 而不是 DynamicResource 除非资源在运行时发生变化或只能在运行时解析。
<DrawingBrush x:Key="{x:Static local:MainWindow.IpcBrushKey}" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing ... />
<GeometryDrawing ...>
<GeometryDrawing.Pen>
<Pen ... />
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing ...>
<GeometryDrawing.Pen>
<Pen ... />
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing ... />
<!-- Reference the dynamically changing resource -->
<GeometryDrawing Brush="{DynamicResource {x:Static local:MainWindow.ProcessBrushKey}}" ... />
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<!--
The dynamic resources that will replace the dynamic placeholder ProcessBrushKey DynamicResource reference in the IPC Brush
-->
<DrawingBrush x:Key="{x:Static local:MainWindow.Process4ResourceBrushKey}" ...>
... Use StaticResource instead of DynamicResource
</DrawingBrush>
<DrawingBrush x:Key="{x:Static local:MainWindow.Process6ResourceBrushKey}" ...>
... Use StaticResource instead of DynamicResource
</DrawingBrush>
<!-- The placeholder Brush that is referenced by the IPC Brush
and itself references the Process4 Brush by default.
This refernce is later dynamically overridden (see below).
Alternatively remove this brush and initialize the resource key on
application startup -->
<DrawingBrush x:Key="{x:Static local:MainWindow.ProcessBrushKey}"
Drawing="{Binding Source={StaticResource {x:Static local:MainWindow.Process4ResourceBrushKey}}, Path=Drawing}" />
实际资源交换
// Sets the IPC Brush reference to Process6 Brush
private void ChangeAndFreezeDynamicResourcesOfKnownResourceDictionay()
{
// Get the ResourceDictionary or dictionaries that define the resources
ResourceDictionary resources = Application.Current.Resources.Contains(MainWindow.Process6ResourceBrushKey)
? Application.Current.Resources
: Application.Current.Resources.MergedDictionaries.First(resources => resources.Contains(MainWindow.Process6ResourceBrushKey));
var process6Brush = resources[MainWindow.Process6ResourceBrushKey] as Brush;
// Update the resources that is registered with the ProcessBrushKey resource key,
// which are referenced by the "IPC" Brush
resources[MainWindow.ProcessBrushKey] = process6Brush;
/*
Update IPC DrawingBrush which is the actual brush referenced by the view
*/
var ipcBrush = resources[IpcBrushKey] as Brush;
var ipcBrushClone = ipcBrushClone.Clone();
// Resources that contain DynamicResource references can't be frozen
if (ipcBrushClone.CanFreeze && !ipcBrushClone.IsFrozen)
{
ipcBrushClone.Freeze();
}
resources[IpcBrushKey] = ipcBrushClone;
}
我有一个包含许多 ResourceDictionaries 的 MVVM 项目。我已经可以为颜色资源设置动画并动态更改画笔。更新作品。不幸的是，“重新链接” DynamicResource 不起作用。 我的目标是通过代码将资源“IPC”中的 Brush="{DynamicResource Process4}" 交换为 Brush="{DynamicResource Process6}"。解决方案必须是动态的。最好的方法是直接绑定到我的 ViewModel 的 属性。
我已经在 IPC 中尝试过 Brush="{DynamicResource Processes}"，但是更新 ProcessesMask 属性 并没有更新 IPC。
public class ViewModel : ViewModelBase
{
private Brush _ProcessesMask = GetAppResObject<DrawingBrush>("Process9");
public Brush ProcessesMask
{
get
{
return _ProcessesMask;
}
set
{
_ProcessesMask = Value;
PropertyChanged("ProcessesMask");
}
}
private T GetAppResObject<T>(string resourceKey)
{
try
{
object value = Windows.Application.Current.FindResource(resourceKey);
if (value is T)
return (T)value;
else
return default(T);
}
catch (Exception ex)
{
Logger.Append($"{typeof(T).Name} not found in the resources: {resourceKey}");
return default(T);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen00"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen01"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen02"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen10"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen11"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen12"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen20"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen21"></SolidColorBrush>
<SolidColorBrush Color="#00FFFFFF" x:Key="Screen22"></SolidColorBrush>
<DrawingBrush x:Key="Processes" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="{Binding ViewModel.ProcessesMask, UpdateSourceTrigger=PropertyChanged}" Geometry="F1 M 0.220913,0.220886L 164.221,0.220886L 164.221,104.221L 0.220913,104.221L 0.220913,0.220886 Z "/>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="Process4" Stretch="Uniform" >
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="{DynamicResource Screen00}" Geometry="F1 M 2.6668,-3.8147e-005L 75.3332,-3.8147e-005C 76.806,-3.8147e-005 78,1.19395 78,2.66677L 78,45.3332C 78,46.806 76.806,48 75.3332,48L 2.6668,48C 1.19397,48 -6.70045e-006,46.806 -6.70045e-006,45.3332L -6.70045e-006,2.66677C -6.70045e-006,1.19395 1.19397,-3.8147e-005 2.6668,-3.8147e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.206964" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen01}" Geometry="F1 M 88.6668,7.62939e-006L 161.333,7.62939e-006C 162.806,7.62939e-006 164,1.19397 164,2.66679L 164,45.3332C 164,46.806 162.806,48 161.333,48L 88.6668,48C 87.194,48 86,46.806 86,45.3332L 86,2.66679C 86,1.19397 87.194,7.62939e-006 88.6668,7.62939e-006 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.206829" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen10}" Geometry="F1 M 2.6668,56L 75.3332,56C 76.8061,56 78,57.194 78,58.6668L 78,101.333C 78,102.806 76.8061,104 75.3332,104L 2.6668,104C 1.19397,104 -5.2378e-006,102.806 -5.2378e-006,101.333L -5.2378e-006,58.6668C -5.2378e-006,57.194 1.19397,56 2.6668,56 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen11}" Geometry="F1 M 88.6668,56L 161.333,56C 162.806,56 164,57.1939 164,58.6667L 164,101.333C 164,102.806 162.806,104 161.333,104L 88.6668,104C 87.194,104 86,102.806 86,101.333L 86,58.6667C 86,57.1939 87.194,56 88.6668,56 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.207383" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="Process6" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="{DynamicResource Screen00}" Geometry="F1 M 2.66679,-3.8147e-005L 47.3332,-3.8147e-005C 48.806,-3.8147e-005 50,1.19395 50,2.66677L 50,45.3332C 50,46.806 48.806,48 47.3332,48L 2.66679,48C 1.19397,48 -3.58676e-006,46.806 -3.58676e-006,45.3332L -3.58676e-006,2.66677C -3.58676e-006,1.19395 1.19397,-3.8147e-005 2.66679,-3.8147e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.206964" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen01}" Geometry="F1 M 59.6668,9.15527e-005L 104.333,9.15527e-005C 105.806,9.15527e-005 107,1.19405 107,2.66688L 107,45.3333C 107,46.8062 105.806,48.0001 104.333,48.0001L 59.6668,48.0001C 58.194,48.0001 57,46.8062 57,45.3333L 57,2.66688C 57,1.19405 58.194,9.15527e-005 59.6668,9.15527e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.204468" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen02}" Geometry="F1 M 2.66676,56.0001L 47.3332,56.0001C 48.806,56.0001 50,57.1941 50,58.6669L 50,101.333C 50,102.806 48.806,104 47.3332,104L 2.66676,104C 1.19393,104 -3.62374e-005,102.806 -3.62374e-005,101.333L -3.62374e-005,58.6669C -3.62374e-005,57.1941 1.19393,56.0001 2.66676,56.0001 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen10}" Geometry="F1 M 59.6668,56L 104.333,56C 105.806,56 107,57.194 107,58.6668L 107,101.333C 107,102.806 105.806,104 104.333,104L 59.6668,104C 58.194,104 57,102.806 57,101.333L 57,58.6668C 57,57.194 58.194,56 59.6668,56 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.207383" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen11}" Geometry="F1 M 116.667,5.34058e-005L 161.333,5.34058e-005C 162.806,5.34058e-005 164,1.19401 164,2.66684L 164,45.3333C 164,46.8061 162.806,48.0001 161.333,48.0001L 116.667,48.0001C 115.194,48.0001 114,46.8061 114,45.3333L 114,2.66684C 114,1.19401 115.194,5.34058e-005 116.667,5.34058e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.204468" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen12}" Geometry="F1 M 116.667,56L 161.333,56C 162.806,56 164,57.194 164,58.6668L 164,101.333C 164,102.806 162.806,104 161.333,104L 116.667,104C 115.194,104 114,102.806 114,101.333L 114,58.6668C 114,57.194 115.194,56 116.667,56 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.205016" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="Process9" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="{DynamicResource Screen00}" Geometry="F1 M 2.66681,-5.34058e-005L 47.3332,-5.34058e-005C 48.806,-5.34058e-005 50,1.19392 50,2.66675L 50,29.3331C 50,30.806 48.806,32 47.3332,32L 2.66681,32C 1.19398,32 1.56308e-005,30.806 1.56308e-005,29.3331L 1.56308e-005,2.66675C 1.56308e-005,1.19392 1.19398,-5.34058e-005 2.66681,-5.34058e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.209617" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen01}" Geometry="F1 M 2.66678,36L 47.3332,36C 48.806,36 50,37.1939 50,38.6668L 50,65.3331C 50,66.806 48.806,68 47.3332,68L 2.66678,68C 1.19395,68 -1.81472e-005,66.806 -1.81472e-005,65.3331L -1.81472e-005,38.6668C -1.81472e-005,37.1939 1.19395,36 2.66678,36 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen02}" Geometry="F1 M 2.6668,72.0001L 47.3332,72.0001C 48.806,72.0001 50,73.194 50,74.6668L 50,101.333C 50,102.806 48.806,104 47.3332,104L 2.6668,104C 1.19398,104 8.08905e-006,102.806 8.08905e-006,101.333L 8.08905e-006,74.6668C 8.08905e-006,73.194 1.19398,72.0001 2.6668,72.0001 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen10}" Geometry="F1 M 116.667,-9.15527e-005L 161.333,-9.15527e-005C 162.806,-9.15527e-005 164,1.19388 164,2.66671L 164,29.3331C 164,30.806 162.806,31.9999 161.333,31.9999L 116.667,31.9999C 115.194,31.9999 114,30.806 114,29.3331L 114,2.66671C 114,1.19388 115.194,-9.15527e-005 116.667,-9.15527e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.209617" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen11}" Geometry="F1 M 116.667,35.9999L 161.333,35.9999C 162.806,35.9999 164,37.1939 164,38.6667L 164,65.3331C 164,66.806 162.806,67.9999 161.333,67.9999L 116.667,67.9999C 115.194,67.9999 114,66.806 114,65.3331L 114,38.6667C 114,37.1939 115.194,35.9999 116.667,35.9999 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen12}" Geometry="F1 M 116.667,72.0001L 161.333,72.0001C 162.806,72.0001 164,73.194 164,74.6669L 164,101.333C 164,102.806 162.806,104 161.333,104L 116.667,104C 115.194,104 114,102.806 114,101.333L 114,74.6669C 114,73.194 115.194,72.0001 116.667,72.0001 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen20}" Geometry="F1 M 62.6668,-0.0001297L 107.333,-0.0001297C 108.806,-0.0001297 110,1.19384 110,2.66666L 110,29.3331C 110,30.806 108.806,31.9999 107.333,31.9999L 62.6668,31.9999C 61.194,31.9999 60,30.806 60,29.3331L 60,2.66666C 60,1.19384 61.194,-0.0001297 62.6668,-0.0001297 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.209617" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen21}" Geometry="F1 M 62.6668,35.9999L 107.333,35.9999C 108.806,35.9999 110,37.1939 110,38.6667L 110,65.3331C 110,66.8059 108.806,67.9999 107.333,67.9999L 62.6668,67.9999C 61.194,67.9999 60,66.8059 60,65.3331L 60,38.6667C 60,37.1939 61.194,35.9999 62.6668,35.9999 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="{DynamicResource Screen22}" Geometry="F1 M 62.6668,72.0001L 107.333,72.0001C 108.806,72.0001 110,73.1941 110,74.6669L 110,101.333C 110,102.806 108.806,104 107.333,104L 62.6668,104C 61.194,104 60,102.806 60,101.333L 60,74.6669C 60,73.1941 61.194,72.0001 62.6668,72.0001 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="#FFFF0000" Geometry="F1 M 54.5,-2.28882e-005L 55.5,-2.28882e-005C 56.0523,-2.28882e-005 56.5,0.447784 56.5,1L 56.5,103C 56.5,103.552 56.0523,104 55.5,104L 54.5,104C 53.9477,104 53.5,103.552 53.5,103L 53.5,1C 53.5,0.447784 53.9477,-2.28882e-005 54.5,-2.28882e-005 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.208717" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<DrawingBrush x:Key="IPC" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing Brush="#00000000" Geometry="F1 M 0,-0.000213623L 348,-0.000213623L 348,278L 0,278L 0,-0.000213623 Z "/>
<GeometryDrawing Geometry="F1 M 73.3334,64.0148L 274.667,64.0148C 275.403,64.0148 276,64.6117 276,65.3482L 276,212.667C 276,213.403 275.403,214 274.667,214L 73.3334,214C 72.597,214 72,213.403 72,212.667L 72,65.3482C 72,64.6117 72.597,64.0148 73.3334,64.0148 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="2.06475" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing Brush="#FFFFFFFF" Geometry="F1 M 73.6854,193.936L 274.238,193.936C 274.607,193.936 274.905,194.234 274.905,194.603L 274.905,212.134C 274.905,212.502 274.607,212.801 274.238,212.801L 73.6854,212.801C 73.3172,212.801 73.0187,212.502 73.0187,212.134L 73.0187,194.603C 73.0187,194.234 73.3172,193.936 73.6854,193.936 Z ">
<GeometryDrawing.Pen>
<Pen Thickness="0.198569" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
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<GeometryDrawing Brush="{DynamicResource Process4}" Geometry="F1 M 93.0001,76.0001L 255,76.0001L 255,181L 93.0001,181L 93.0001,76.0001 Z "/>
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
</ResourceDictionary>
您绝对不想在视图模型中管理视图资源。而且您不想更改引用密钥本身：这意味着您必须重建所有 elements/XAML 才能更新引用的资源密钥。
您想要使用相同的资源密钥，例如DynamicBrushKey 并更改资源，例如它引用的 Color。
如果您可以直接访问定义资源的 ResourceDictionary，例如通过拥有元素或 MergedDictionary，您可以冻结它们以提高性能。您还可以使用 StaticResource 引用 Color 资源，这进一步提高了性能。
由于您必须在代码隐藏中处理资源键，我建议创建静态资源键以避免魔术字符串。这也简化了重构。这些静态键可以在任何 class.
MainWindow.xaml.cs
partial class MainWindow : Window
{
public static ResourceKey DynamicBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "DynamicBackgroundBrush");
public static ResourceKey BlueColorResourceKey { get; } = new ComponentResourceKey(typeof(MainWindow), "BlueColorResource");
public static ResourceKey RedColorResourceKey { get; } = new ComponentResourceKey(typeof(MainWindow), "RedColorResource");
private void AddResourcesDynamically()
{
// Get the ResourceDictionary or dictionaries that should define the resources
ResourceDictionary resources = Application.Current.Resources;
resources[<new_key>] = Colors.Green;
}
private void ChangeAndFreezeDynamicResourcesOfKnownResourceDictionay()
{
// Get the ResourceDictionary or dictionaries that define the resources
ResourceDictionary resources = Application.Current.Resources.Contains(MainWindow.DynamicBrushKey)
? Application.Current.Resources
: Application.Current.Resources.MergedDictionaries.First(resources => resources.Contains(MainWindow.DynamicBrushKey));
var dynamicBrush = resources[MainWindow.DynamicBrushKey] as SolidColorBrush;
var newColor = (Color)resources[MainWindow.BlueColorResourceKey];
if (dynamicBrush.IsFrozen)
{
dynamicBrush = dynamicBrush.Clone();
}
dynamicBrush.Color = newColor;
dynamicBrush.Freeze();
resources[MainWindow.DynamicBrushKey] = dynamicBrush;
}
// Resource should not be frozen i.e. referenced using DynamicResource
private void ChangeDynamicResourcesOfUnknownResourceDictionay()
{
var dynamicBrush = FindResource(MainWindow.DynamicBrushKey) as SolidColorBrush;
if (dynamicBrush.IsFrozen)
{
return;
}
var newColor = (Color)FindResource(MainWindow.BlueColorResourceKey);
dynamicBrush.Color = newColor;
}
}
MainWindow.xaml
<Window>
<Rectangle Fill="{DynamicResource {x:Static local:MainWindow.DynamicBrushKey}}"
Height="100" Width="100" />
</Window>
Colors.xaml
<ResourceDictionary>
<Color x:Key="{x:Static local:MainWindow.RedColorResourceKey}">Red</Color>
<Color x:Key="{x:Static local:MainWindow.BlueColorResourceKey}">Blue</Color>
<!-- The dynamic Brush resource -->
<SolidColorBrush x:Key="{x:Static local:MainWindow.DynamicBrushKey}" Color="{StaticResource {x:Static local:MainWindow.RedColorResourceKey}}" />
</ResourceDictionary>
App.xaml
<Application>
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Colors.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
问题更具体的例子
public static ResourceKey IpcBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "IpcBrush");
public static ResourceKey ProcessBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "ProcessBrush");
public static ResourceKey Process4ResourceBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "Process4Brush");
public static ResourceKey Process6ResourceBrushKey { get; } = new ComponentResourceKey(typeof(MainWindow), "Process6Brush");
App.xaml
<Application>
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Colors.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
Colors.xaml
强烈建议将 ProcessX 笔刷内的笔刷引用为 StaticResource。它们不会更改并引用它们，因为 StaticResource 允许它们在添加到 ResourceDictionary 时被冻结。这提高了性能。总是首选 StaticResource 而不是 DynamicResource 除非资源在运行时发生变化或只能在运行时解析。
<DrawingBrush x:Key="{x:Static local:MainWindow.IpcBrushKey}" Stretch="Uniform">
<DrawingBrush.Drawing>
<DrawingGroup>
<DrawingGroup.Children>
<GeometryDrawing ... />
<GeometryDrawing ...>
<GeometryDrawing.Pen>
<Pen ... />
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing ...>
<GeometryDrawing.Pen>
<Pen ... />
</GeometryDrawing.Pen>
</GeometryDrawing>
<GeometryDrawing ... />
<!-- Reference the dynamically changing resource -->
<GeometryDrawing Brush="{DynamicResource {x:Static local:MainWindow.ProcessBrushKey}}" ... />
</DrawingGroup.Children>
</DrawingGroup>
</DrawingBrush.Drawing>
</DrawingBrush>
<!--
The dynamic resources that will replace the dynamic placeholder ProcessBrushKey DynamicResource reference in the IPC Brush
-->
<DrawingBrush x:Key="{x:Static local:MainWindow.Process4ResourceBrushKey}" ...>
... Use StaticResource instead of DynamicResource
</DrawingBrush>
<DrawingBrush x:Key="{x:Static local:MainWindow.Process6ResourceBrushKey}" ...>
... Use StaticResource instead of DynamicResource
</DrawingBrush>
<!-- The placeholder Brush that is referenced by the IPC Brush
and itself references the Process4 Brush by default.
This refernce is later dynamically overridden (see below).
Alternatively remove this brush and initialize the resource key on
application startup -->
<DrawingBrush x:Key="{x:Static local:MainWindow.ProcessBrushKey}"
Drawing="{Binding Source={StaticResource {x:Static local:MainWindow.Process4ResourceBrushKey}}, Path=Drawing}" />
实际资源交换
// Sets the IPC Brush reference to Process6 Brush
private void ChangeAndFreezeDynamicResourcesOfKnownResourceDictionay()
{
// Get the ResourceDictionary or dictionaries that define the resources
ResourceDictionary resources = Application.Current.Resources.Contains(MainWindow.Process6ResourceBrushKey)
? Application.Current.Resources
: Application.Current.Resources.MergedDictionaries.First(resources => resources.Contains(MainWindow.Process6ResourceBrushKey));
var process6Brush = resources[MainWindow.Process6ResourceBrushKey] as Brush;
// Update the resources that is registered with the ProcessBrushKey resource key,
// which are referenced by the "IPC" Brush
resources[MainWindow.ProcessBrushKey] = process6Brush;
/*
Update IPC DrawingBrush which is the actual brush referenced by the view
*/
var ipcBrush = resources[IpcBrushKey] as Brush;
var ipcBrushClone = ipcBrushClone.Clone();
// Resources that contain DynamicResource references can't be frozen
if (ipcBrushClone.CanFreeze && !ipcBrushClone.IsFrozen)
{
ipcBrushClone.Freeze();
}
resources[IpcBrushKey] = ipcBrushClone;
}