如何通过TextBlock文本值设置TextBlock的Foreground属性? [英] How do I set the Foreground property of a TextBlock by TextBlock text value?

问题描述

是否可以通过TextBlock文本值设置TextBlock的前台属性? 例如:文本值为Mike，前景属性为Black，值为Tim，属性值为绿色，依此类推.我用google搜索，但找不到任何解决方案.

it’s possible set the foreground property of a TextBlock by TextBlock text value? For example: Text value is Mike, foreground property is Black, value is Tim, property value is green, etc. I search with google, but I don’t find any solution.

推荐答案

如果您希望灵活地执行一些聪明的事情，例如将文本动态映射为颜色等，则可以使用Converter类.我假设文本设置为绑定到某些东西，您可以在前景中绑定到相同的东西，但可以通过自定义转换器:

If you want the flexibility to do something smart, such as dynamically map texts to colors and so on, you could use a Converter class. I am assuming the text is set to bind to something, you could bind to the same something in Foreground but through a custom converter:

<TextBlock Text="{Binding Path=Foo}" 
           Foreground="{Binding Path=Foo, Converter={StaticResource myConverter}" />

您的转换器将被定义如下:

Your converter would be defined something like this:

public class ColorConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        string text = (string)value;
        switch (text)
        {
            case "Mike":
                return Colors.Red;
            case "John":
                return Colors.Blue;
            default:
                return Colors.Black;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return null;
    }
}

显然，您可以使用更智能的逻辑来处理新值等，而不是简单的switch语句.

Obviously, instead of the simple switch statement you could have smarter logic to handle new values and such.

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