1

我有一个文本框供用户输入 6 个字符的十六进制颜色值、一个验证器和一个附加到它的转换器。到这里为止，一切正常。但我想将文本框的Background颜色绑定到文本框（ElementNames Background& Foreground）指定的颜色，它似乎不起作用。

当我调试/单步执行代码时，该值似乎总是""

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}}" />

转换器

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();
    }
}
4

2 回答 2

0

每个人都说你需要刷子而不是颜色是对的。

解决方案：创建另一个返回 SolidColorBrush 的转换器，您将获得金色。

于 2010-12-05T01:41:01.187 回答
0

这可能对从事 Asp.net 技术工作的人有所帮助。用于在 GridView 中绑定 Textbox 的值时设置 Textbox 的 Forecolor 和 Backcolor。我在 .Net 4.6 版中使用它，我希望它也支持其他版本.. 谢谢

  <asp:GridView ID="GridViewStatus"  runat="server">
                 <Columns>
                      <asp:TemplateField HeaderText="Status" ItemStyle-Width="100px" >
                           <ItemTemplate>      
                              <asp:Label ID="lbljobstatusAll" runat="server" 
    Text="<%#Eval("Status")  %>"  ForeColor='<%# Eval("Status").ToString().Contains("Yes") ? System.Drawing.Color.Green : System.Drawing.Color.Blue %>' />
                           </ItemTemplate>
                        </asp:TemplateField>
                 </Columns>
    </asp:GridView>
于 2020-02-07T15:48:15.467 回答