如何定义和在XAML中使用的资源，使他们能够在C＃中使用 [英] How to define and use resources in xaml so they can be used in C#

问题描述

从理论上讲，我认为我可以在XAML文件中定义画笔和颜色等，并将其赋值给在C＃中button.background。但我怎么做呢？我在哪里把我的一个LinearGradientBrush的定义是这样的：

 <一个LinearGradientBrush X：键=BlaBrush> 
将;渐变停止偏移=0颜色=红/> 
<渐变停止偏移=1颜色=绿色/> 
< /一个LinearGradientBrush> /   

只是把它在各种错误消息在我窗口的XAML文件的结果不同的地方>

我发现这个问题，在这里计算器：的 http://stackoverflow.com/questions/1248177/how-to-use-a-defined-brush-resource-in-xaml-from-c 这解释了它的一部分，但他似乎知道在哪里做刷机的定义。

我也试过添加shinyblue.xaml WPF模板应用程序，并添加< ResourceDictionary中源=ShinyBlue.xaml/> 在App.xaml中的application.resources。这使我的所有按钮的蓝色瞬间，不过，在东西像NormalBrush shinyblue.xaml定义不再是从C＃访问 - 至少我不知道该怎么

马克

解决方案

您的XAML会是这个样子：

MainWindow.xaml

 <窗​​口x：类=BrushResource.MainWindow
的xmlns =HTTP：/ /schemas.microsoft.com/winfx/2006/xaml/presentation
的xmlns：X =http://schemas.microsoft.com/winfx/2006/xaml
标题=主窗口身高=350宽度=525> 
 
< Window.Resources> 
<一个LinearGradientBrush X：键=BrushOneStartPoint可以=0,0.5终点=1,0.5透明度=0.5> 
< LinearGradientBrush.GradientStops> 
< GradientStopCollection> 
<渐变停止颜色=黑偏移量=0/> 
<渐变停止颜色=银偏移量=1/> 
< / GradientStopCollection> 
< /LinearGradientBrush.GradientStops> 
< /一个LinearGradientBrush> 
 
<一个LinearGradientBrush X：键=BrushTwoStartPoint可以=0,0.5终点=1,0.5透明度=0.5> 
< LinearGradientBrush.GradientStops> 
< GradientStopCollection> 
<渐变停止颜色=栗色偏移量=0/> 
<渐变停止颜色=银偏移量=1/> 
< / GradientStopCollection> 
< /LinearGradientBrush.GradientStops> 
< /一个LinearGradientBrush> 
< /Window.Resources> 
 
<&StackPanel的GT; 
<按钮内容=按钮WIDTH =100点击=myButton_Click/> 
< / StackPanel的> 
  

要指定值，要抓住从资源渐变画笔是这样的：

MainWindow.xaml.cs

 私人无效myBu​​tton_Click（对象发件人，RoutedEventArgs E）
 {
（发件人为按钮）=技术领域this.Resources [BrushOne]作为一个LinearGradientBrush; 
} 
  

Theoretically, I think that I can define Brushes and Colors etc. in an xaml file and assign that to a button.background in c#. But how do I do that? Where do I put my lineargradientbrush definition like this:

<LinearGradientBrush x:Key="BlaBrush">
                <GradientStop Offset="0" Color="Red"/>
                <GradientStop Offset="1" Color="Green"/>
</LinearGradientBrush>

Just putting it at various places in my window's xaml file results in various error messages :/

I found this question here on stackoverflow: http://stackoverflow.com/questions/1248177/how-to-use-a-defined-brush-resource-in-xaml-from-c which explains a part of it, but he seems to know where to do the Brush definition.

I also tried adding the shinyblue.xaml wpf template to the app and added <ResourceDictionary Source="ShinyBlue.xaml"/> to the application.resources in app.xaml. This makes all my buttons blue instantly, but still, the "things" defined in shinyblue.xaml like NormalBrush is not accessible from C# - at least I don't know how.

Marc

解决方案

Your xaml would look something like this:

MainWindow.xaml

<Window x:Class="BrushResource.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>
    <LinearGradientBrush x:Key="BrushOne" StartPoint="0,0.5" EndPoint="1,0.5" Opacity="0.5">
        <LinearGradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="Black" Offset="0" />
                <GradientStop Color="Silver" Offset="1" />
            </GradientStopCollection>
        </LinearGradientBrush.GradientStops>
    </LinearGradientBrush>

    <LinearGradientBrush x:Key="BrushTwo" StartPoint="0,0.5" EndPoint="1,0.5" Opacity="0.5">
        <LinearGradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="Maroon" Offset="0" />
                <GradientStop Color="Silver" Offset="1" />
            </GradientStopCollection>
        </LinearGradientBrush.GradientStops>
    </LinearGradientBrush>
</Window.Resources>

<StackPanel>
    <Button Content="Button" Width="100" Click="myButton_Click"/>
</StackPanel>

To assign the value, you need to grab the gradient brush from the resources like this:

MainWindow.xaml.cs

private void myButton_Click(object sender, RoutedEventArgs e)
    {
        (sender as Button).Background = this.Resources["BrushOne"] as LinearGradientBrush;
    }

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