如何綁定到文本框背景顏色

我有一個文本框供用戶輸入6個字符的十六進制顏色值，一個驗證器&轉換器附加到它。到此爲止，一切正常。但我想將文本框的顏色與文本框中指定的顏色綁定（ElementName s Background & Foreground），並且它似乎不起作用。如何綁定到文本框背景顏色

當我調試通過代碼/步，值似乎總是""

XAML

<TextBox x:Name="Background" Canvas.Left="328" Canvas.Top="33" Height="23" Width="60"> 
    <TextBox.Text> 
     <Binding Path="Background"> 
      <Binding.ValidationRules> 
       <validators:ColorValidator Property="Background" /> 
      </Binding.ValidationRules> 
      <Binding.Converter> 
       <converters:ColorConverter /> 
      </Binding.Converter> 
     </Binding> 
    </TextBox.Text> 
</TextBox> 
<TextBlock Canvas.Left="403" Canvas.Top="12" Text="Foreground" /> 
<TextBox x:Name="Foreground" Canvas.Left="403" Canvas.Top="33" Height="23" Width="60"> 
    <TextBox.Text> 
     <Binding Path="Foreground"> 
      <Binding.ValidationRules> 
       <validators:ColorValidator Property="Foreground" /> 
      </Binding.ValidationRules> 
      <Binding.Converter> 
       <converters:ColorConverter /> 
      </Binding.Converter> 
     </Binding> 
    </TextBox.Text> 
</TextBox> 

<!-- in this example I used the converter used in the TextBox & another converter that converts a string to color --> 
<TextBox ... 
    Background="{Binding ElementName=Background, Path=Text, Converter={StaticResource colorConverter}}" 
    Foreground="{Binding ElementName=Foreground, Path=Text, Converter={StaticResource stringToColorConverter}}" />

轉換器

class ColorConverter : IValueConverter 
{ 
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     try 
     { 
      string entry = ((Color)value).ToString(); 
      return entry.Substring(3); 
     } catch (Exception) { 
      return Binding.DoNothing; 
     } 

    } 

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     string entry = (string)value; 
     Validators.ColorValidator validator = new Validators.ColorValidator(); 
     if (!validator.Validate(entry, System.Globalization.CultureInfo.CurrentCulture).IsValid) { 
      return Binding.DoNothing; 
     } 
     return (Color)System.Windows.Media.ColorConverter.ConvertFromString("#FF" + entry); 
    } 
} 

class StringToColorConverter : IValueConverter 
{ 
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     string entry = (string)value; 
     Validators.ColorValidator validator = new Validators.ColorValidator(); 
     if (!validator.Validate(entry, System.Globalization.CultureInfo.CurrentCulture).IsValid) 
     { 
      return Binding.DoNothing; 
     } 
     return (Color)System.Windows.Media.ColorConverter.ConvertFromString("#FF" + entry); 
    } 

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 
}

來源

2010-11-03 Jiew Meng

我不確定，因此一個評論，但也許問題是，TextBox.Background等都需要一個畫筆，而不是一個顏色。 – Jens 2010-11-03 13:19:32

一個更好的標題肯定會有助於收集適當的關注。 – dhill 2010-11-03 13:19:50

正如Jens所說，嘗試轉換爲Brush而不是Color – snurre 2010-11-03 13:23:43

大家說你需要一個刷而不是顏色是正確的。

解決方案：創建另一個返回SolidColorBrush的轉換器，您將成爲金手指。

來源

2010-12-05 01:41:01 Brian

如何綁定到文本框背景顏色

回答

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