我有一个布尔值,需要在 TextBlock 中显示为是"或否".我正在尝试使用 StringFormat 执行此操作,但我的 StringFormat 被忽略并且 TextBlock 显示True"或False".
I have a bool value that I need to display as "Yes" or "No" in a TextBlock. I am trying to do this with a StringFormat, but my StringFormat is ignored and the TextBlock displays "True" or "False".
<TextBlock Text="{Binding Path=MyBoolValue, StringFormat='{}{0:Yes;;No}'}" />是我的语法有问题,还是不支持这种类型的 StringFormat?
Is there something wrong with my syntax, or is this type of StringFormat not supported?
我知道我可以使用 ValueConverter 来完成此操作,但 StringFormat 解决方案似乎更优雅(如果有效).
I know I can use a ValueConverter to accomplish this, but the StringFormat solution seems more elegant (if it worked).
推荐答案您使用 StringFormat 的解决方案不起作用,因为它不是有效的格式字符串.
Your solution with StringFormat can't work, because it's not a valid format string.
我写了一个可以做你想做的标记扩展.你可以这样使用它:
I wrote a markup extension that would do what you want. You can use it like that :
<TextBlock Text="{my:SwitchBinding MyBoolValue, Yes, No}" />这里是标记扩展的代码:
Here the code for the markup extension :
public class SwitchBindingExtension : Binding { public SwitchBindingExtension() { Initialize(); } public SwitchBindingExtension(string path) : base(path) { Initialize(); } public SwitchBindingExtension(string path, object valueIfTrue, object valueIfFalse) : base(path) { Initialize(); this.ValueIfTrue = valueIfTrue; this.ValueIfFalse = valueIfFalse; } private void Initialize() { this.ValueIfTrue = Binding.DoNothing; this.ValueIfFalse = Binding.DoNothing; this.Converter = new SwitchConverter(this); } [ConstructorArgument("valueIfTrue")] public object ValueIfTrue { get; set; } [ConstructorArgument("valueIfFalse")] public object ValueIfFalse { get; set; } private class SwitchConverter : IValueConverter { public SwitchConverter(SwitchBindingExtension switchExtension) { _switch = switchExtension; } private SwitchBindingExtension _switch; #region IValueConverter Members public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { try { bool b = System.Convert.ToBoolean(value); return b ? _switch.ValueIfTrue : _switch.ValueIfFalse; } catch { return DependencyProperty.UnsetValue; } } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { return Binding.DoNothing; } #endregion } }更多推荐
WPF:将布尔值显示为“是"/“不"
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