“Logical resources may be of various types, such as brushes, geometries, styles, and templates.
Placing all those resources in a single file such as App.xaml hinders maintainability. A better
approach would be to separate resources of different types (or based on some other criteria) to
their own files. Still, they must be referenced somehow from within a common file such as App.
xaml so they are recognized.”
为了增加资源文件的可维护性，我们应该使用ResourceDictionary对资源进行：分类、汇总。
如何实现呢？举个例子
1.新建一个WPF Application，在Application中添加一个New Item，选择ResourceDictionary。
譬如，命名为Brushes.xaml，我们用它来存放一些笔刷。打开，我们添加一个笔刷如下：
Brushes.xaml:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <LinearGradientBrush EndPoint="1,0" x:Key="brush1"> <GradientStop Color="Violet" Offset="0" /> <GradientStop Color="Orange" Offset=".7" /> <GradientStop Color="Brown" Offset="1" /> </LinearGradientBrush> </ResourceDictionary>
2.在App.xaml中Merge则个Resource。
“Open App.xaml. We need to merge external resource dictionaries into the main
application dictionary.”
打开App.xaml，添加如下内容：
<Application x:Class="ManagingLogicalResources.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="MainWindow.xaml"> <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Brushes.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources> </Application>
3.这样我们就可以在页面中正常使用了。
<Window x:Class="ManagingLogicalResources.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid> <Ellipse Fill="{StaticResource brush1}"/> </Grid> </Window>
效果如下：
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在实际开发中更常用的做法是：直接在使用的View内部Merge。
<Window x:Class="WPFMergedDicitonary.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Window.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Brushes.xaml"/> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Window.Resources> <Grid> <Ellipse Fill="{StaticResource brush1}"/> </Grid> </Window>
效果同上，如下：