使用转换器从System.Windows.SystemParameters.PrimaryScreenWidth进行WPF绑定 [英] WPF Binding from System.Windows.SystemParameters.PrimaryScreenWidth with a Converter

问题描述

我试图将System.Windows.SystemParameters.PrimaryScreenWidth绑定到ColumnDefinition的（在 Grid中）Width属性，并使用转换器将 PrimaryScreenWidth转换为 GridLength。但是它永远不会进入转换代码。

I'm trying to bind System.Windows.SystemParameters.PrimaryScreenWidth to a ColumnDefinition's (From within a 'Grid') Width property, and using a converter to convert the 'PrimaryScreenWidth' into a 'GridLength'. But it never gets inside the 'convert' code.

这是我的XAML：

<Window.Resources>
   <local:ScreenWidthToLeftBarWidth x:Key="leftBarConverter" />
</Window.Resources>
<ColumnDefinition Width="{Binding ElementName=System.Windows.SystemParameters, Path=PrimaryScreenWidth, Converter={StaticResource leftBarConverter}}"/>

这是转换器的我的CodeBehind（省略了 ConvertBack方法：

Here's my CodeBehind for the converter (leaving out the 'ConvertBack' method:

public class ScreenWidthToLeftBarWidth : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            double aValue = (double)value;
            GridLength newWidth = new GridLength(aValue);
            return (newWidth);
        }
    }

现在，在使用按钮对象Width和通过转换器运行它，所以我认为问题出在我如何尝试从 ElementName = System.Windows.SystemParameters进行绑定。感谢您的帮助。

Now, I've been able to bind successfully in a slightly different scenario of using a 'Button' objects Width and running it through a converter, So I'm thinking the problem is with how I'm trying to bind from the "ElementName=System.Windows.SystemParameters". Any help appreciated, thanks.

推荐答案

ElementName 用于XAML中的其他元素；为此，您将需要 x：Static ，例如

ElementName is for other elements in XAML; for this you will need something like x:Static, e.g.

Width="{Binding Source={x:Static SystemParameters.PrimaryScreenWidth},
                Converter=...}"

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