Wpf 从代码隐藏更改样式

我有这种款式

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

<Style x:Key="MainMenuStyle" TargetType="{x:Type TextBlock}">

    <Style.Triggers>
        <Trigger Property="IsMouseOver"  Value="True">
            <Setter Property= "Foreground" Value="White"/>
            <Setter Property= "FontSize" Value="22"/>
            <Setter Property= "FontFamily" Value="Arial"/>
        </Trigger>

        <Trigger Property="IsMouseOver"  Value="False">
            <Setter Property= "Foreground" Value="Black" />
            <Setter Property= "FontSize" Value="14"/>
            <Setter Property= "FontFamily" Value="Verdana"/>
        </Trigger>

    </Style.Triggers>

</Style>

我必须只使用框架4

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谢谢您

首次使用后，您无法从MSDN更改您的样式：

当另一个样式基于某个样式时，或当该样式为 第一次申请

在您的例子中，我可能会在XAML中定义另一种样式，并在运行时切换它们

否则，如果您还没有使用它，您可以这样做（使用索引制作一个快速示例）

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江雷戈里奥已经解释了为什么这不能直接实现的大部分原因。但是，这里有一个解决方案：

您可以在样式的

Setters

中使用

DynamicResource

引用，然后当您需要更改样式时，只需更新资源，而不是样式。举个例子，这可能更有意义：

<!-- Colour Resources -->
<SolidColorBrush x:Key="BlueBrush" Color="Blue"/>
<SolidColorBrush x:Key="RedBrush" Color="Red"/>

<!-- TextBlock Style (References the colour resources) -->
<Style x:Key="MainMenuStyle" TargetType="{x:Type TextBlock}"> 

    <Style.Triggers>
        <Trigger Property="IsMouseOver"  Value="True">
            <Setter Property= "Foreground" Value="{DynamicResource BlueBrush}"/>
            ...
        </Trigger>
        <Trigger Property="IsMouseOver"  Value="False">
            <Setter Property= "Foreground" Value="{DynamicResource RedBrush}" />
            ...
        </Trigger>
    </Style.Triggers>

</Style>

DynamicResource

将处理其余部分。

这是我的最终代码

<!-- Colour Resources -->
<!-- Default values -->

<SolidColorBrush x:Key="MenuItem_Select_Color" Color="Blue"/>
<FontFamily x:Key="MenuItem_Select_Font">Calibri</FontFamily>
<sys:Double x:Key="MenuItem_Select_Font_Size">13</sys:Double>

<SolidColorBrush x:Key="MenuItem_UnSelect_Color" Color="Green"/>
<FontFamily x:Key="MenuItem_UnSelect_Font">Arial Black</FontFamily>
<sys:Double x:Key="MenuItem_UnSelect_Font_Size">12</sys:Double>



<!-- TextBlock Style (References the colour resources) -->
<Style x:Key="MainMenuStyle" TargetType="{x:Type TextBlock}">

    <Style.Triggers>
        <Trigger Property="IsMouseOver"  Value="True">
            <Setter Property= "Foreground" Value="{DynamicResource MenuItem_Select_Color}"/>
            <Setter Property= "FontFamily" Value="{DynamicResource MenuItem_Select_Font}"/>
            <Setter Property= "FontSize" Value="{DynamicResource MenuItem_Select_Font_Size}"/>
        </Trigger>

        <Trigger Property="IsMouseOver"  Value="False">
            <Setter Property= "Foreground" Value="{DynamicResource MenuItem_UnSelect_Color}"/>
            <Setter Property= "FontFamily" Value="{DynamicResource MenuItem_UnSelect_Font}"/>
            <Setter Property= "FontSize" Value="{DynamicResource MenuItem_UnSelect_Font_Size}"/>                
        </Trigger>

    </Style.Triggers>

</Style>

---

再见

我坐在那里想我知道wpf支持样式绑定的东西+1好主意；-）非常感谢你。

<!-- Colour Resources -->
<SolidColorBrush x:Key="BlueBrush" Color="Blue"/>
<SolidColorBrush x:Key="RedBrush" Color="Red"/>

<!-- TextBlock Style (References the colour resources) -->
<Style x:Key="MainMenuStyle" TargetType="{x:Type TextBlock}"> 

    <Style.Triggers>
        <Trigger Property="IsMouseOver"  Value="True">
            <Setter Property= "Foreground" Value="{DynamicResource BlueBrush}"/>
            ...
        </Trigger>
        <Trigger Property="IsMouseOver"  Value="False">
            <Setter Property= "Foreground" Value="{DynamicResource RedBrush}" />
            ...
        </Trigger>
    </Style.Triggers>

</Style>

App.Current.Resources["BlueBrush"] = new SolidColorBrush(Colors.Pink);

<!-- Colour Resources -->
<!-- Default values -->

<SolidColorBrush x:Key="MenuItem_Select_Color" Color="Blue"/>
<FontFamily x:Key="MenuItem_Select_Font">Calibri</FontFamily>
<sys:Double x:Key="MenuItem_Select_Font_Size">13</sys:Double>

<SolidColorBrush x:Key="MenuItem_UnSelect_Color" Color="Green"/>
<FontFamily x:Key="MenuItem_UnSelect_Font">Arial Black</FontFamily>
<sys:Double x:Key="MenuItem_UnSelect_Font_Size">12</sys:Double>



<!-- TextBlock Style (References the colour resources) -->
<Style x:Key="MainMenuStyle" TargetType="{x:Type TextBlock}">

    <Style.Triggers>
        <Trigger Property="IsMouseOver"  Value="True">
            <Setter Property= "Foreground" Value="{DynamicResource MenuItem_Select_Color}"/>
            <Setter Property= "FontFamily" Value="{DynamicResource MenuItem_Select_Font}"/>
            <Setter Property= "FontSize" Value="{DynamicResource MenuItem_Select_Font_Size}"/>
        </Trigger>

        <Trigger Property="IsMouseOver"  Value="False">
            <Setter Property= "Foreground" Value="{DynamicResource MenuItem_UnSelect_Color}"/>
            <Setter Property= "FontFamily" Value="{DynamicResource MenuItem_UnSelect_Font}"/>
            <Setter Property= "FontSize" Value="{DynamicResource MenuItem_UnSelect_Font_Size}"/>                
        </Trigger>

    </Style.Triggers>

</Style>

        Application.Current.Resources("MenuItem_Select_Color") = New SolidColorBrush(Colors.DarkBlue)
        Application.Current.Resources("MenuItem_UnSelect_Color") = New SolidColorBrush(Colors.Gold)

        Application.Current.Resources("MenuItem_Select_Font") = New FontFamily("Broadway")
        Application.Current.Resources("MenuItem_UnSelect_Font") = New FontFamily("Lucida Console")

        Application.Current.Resources("MenuItem_Select_Font_Size") = 20
        Application.Current.Resources("MenuItem_UnSelect_Font_Size") = 30