我有一個包含許多 ResourceDictionaries 的 MVVM 專案。我已經可以影片顏色資源并動態更改畫筆。更新作品。不幸的是，“重新鏈接” DynamicResource 不起作用。我的目標是通過代碼在資源“IPC”中將 Brush="{DynamicResource Process4}" 交換為 Brush="{DynamicResource Process6}"。解決方案必須是動態的。最好的方法是直接系結到我的 ViewModel 的屬性。
我已經在 IPC 中嘗試過 Brush="{DynamicResource Processes}"，但是更新 ProcessesMask 屬性并沒有更新 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>
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<GeometryDrawing.Pen>
<Pen Thickness="0.206964" LineJoin="Round" Brush="#FF000000"/>
</GeometryDrawing.Pen>
</GeometryDrawing>
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<GeometryDrawing.Pen>
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</GeometryDrawing.Pen>
</GeometryDrawing>
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<GeometryDrawing.Pen>
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</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>
<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>
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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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</GeometryDrawing>
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</GeometryDrawing>
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<GeometryDrawing.Pen>
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</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>
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</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 ">
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</DrawingGroup.Children>
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</ResourceDictionary>
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您絕對不想在視圖模型中管理視圖資源。并且您不想更改參考鍵本身：這意味著您必須重建所有元素/XAML 以更新參考的資源鍵。
您想使用相同的資源鍵，例如DynamicBrushKey，更改資源，例如Color它參考的資源。
如果您可以直接訪問ResourceDictionary定義資源的 ，例如，通過擁有元素 或MergedDictionary，您可以凍結它們以提高性能。您還可以Color使用參考資源StaticResource，這進一步提高了性能。
由于您必須在代碼隱藏中處理資源鍵，我建議創建靜態資源鍵以避免魔術字串。這也簡化了重構。這些靜態鍵可以在任何類中定義。
主視窗.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;
}
}
主視窗.xaml
<Window>
<Rectangle Fill="{DynamicResource {x:Static local:MainWindow.DynamicBrushKey}}"
Height="100" Width="100" />
</Window>
顏色檔案
<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>
應用程式.xaml
<Application>
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Colors.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
更具體的問題的例子
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");
應用程式.xaml
<Application>
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Colors.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
</Application>
Colors.xaml
It is highly recommended to reference the brushes inside the ProcessX brushes as StaticResource. They don't change and referencing them as StaticResource allows them to be frozen when added to the ResourceDictionary. This improves perfomance. Always prefer StaticResource over DynamicResource except when the resource is changing during runtime or can only be resolved during runtime.
<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}" />
The actual resource swapping
// 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] = dynamicBrush;
}
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