wpf - 如何在 XAML 中将 DataContext 设置为静态属性？

Question

这对我不起作用

<UserControl x:Class="BenchmarkPlus.PMT.UI.Views.Circle"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300" x:Name="root"
             DataContext="{Binding Source={x:Static Brushes.Blue}}">
    <UserControl.Resources>
        <Style TargetType="Ellipse">
            <Setter Property="Fill" Value="{Binding DataContext}" />
        </Style>
    </UserControl.Resources>
    <Grid>
        <Ellipse Stroke="Black"></Ellipse>
    </Grid>
</UserControl>

Answer 1

使其简单DataContext="{x:Static Brushes.Blue}"并更改Value="{Binding DataContext}"为Value="{Binding}".

当您在绑定表达式中指定路径时，它始终与您的 DataContext 相关，因此当您使用 时{Binding DataContext}，您实际上是绑定到DataContext.DataContext，这不是您想要的。

Answer 2

我想你想要

<UserControl x:Class="BenchmarkPlus.PMT.UI.Views.Circle" 
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
             mc:Ignorable="d" d:DesignHeight="300" d:DesignWidth="300" x:Name="root" 
             DataContext="{x:Static Brushes.Blue}"> 
    <UserControl.Resources> 
        <Style TargetType="Ellipse"> 
            <Setter Property="Fill" Value="{Binding}" /> 
        </Style> 
    </UserControl.Resources> 
    <Grid> 
        <Ellipse Stroke="Black"></Ellipse> 
    </Grid> 
</UserControl>