我通过更改资源字典来更改用户控件的样式。换句话说,我有:
字典1.xaml:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style TargetType="Grid">
<Setter Property="Background" Value="Green"></Setter>
</Style>
<SolidColorBrush x:Key="Foo" Color="Blue"></SolidColorBrush>
</ResourceDictionary>
字典2.xaml:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style TargetType="Grid">
<Setter Property="Background" Value="Black"></Setter>
</Style>
<SolidColorBrush x:Key="Foo" Color="Orange"></SolidColorBrush>
</ResourceDictionary>
用户控件1:
<UserControl x:Class="WpfApplication1.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
mc:Ignorable="d" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" d:DesignHeight="103" d:DesignWidth="101">
<Grid >
<Ellipse Fill="{DynamicResource Foo}" />
</Grid>
</UserControl>
代码背后
namespace WpfApplication1
{
using System; using System.Windows; using System.Windows.Controls;
public partial class UserControl1 : UserControl
{
public enum ControlTheme
{
Theme1 , Theme2
}
public UserControl1 ( )
{
InitializeComponent( );
}
public void ChangeTheme ( ControlTheme theme )
{
Resources.MergedDictionaries.Clear( );
int dic = 2;
if ( theme == ControlTheme.Theme1 )
dic = 1;
ResourceDictionary rd = new ResourceDictionary( );
rd.Source = new Uri( @"pack://application:,,,/WpfApplication1;component/Dictionary" + dic + ".xaml" );
Resources.MergedDictionaries.Add( rd );
}
}
}
现在我可以通过调用方法动态更改主题:ChangeTheme
我现在遇到的问题是,如果我放置:
<UserControl.Resources>
<ResourceDictionary Source="Dictionary1.xaml" ></ResourceDictionary>
</UserControl.Resources>
在UserControl1上的ChangeTheme方法不再起作用。我正在寻找一种类似的方法:
//PseudoCode
var itemToRemove = this.UserControlResources.resources.where(x=> x.isDictionary==true);
this.UserControlResources.Remove(itemToRemove);