找不到转换器? XamlParseException:无法使用Name / Key StringTruncator查找资源

时间:2013-05-21 16:11:07

标签: c# xaml windows-phone-8 converter

我在StringTruncator

中添加了App.Resources转换器
xmlns:app="clr-namespace:Tabbed_Browser">

<!--Application Resources-->
<Application.Resources>

    <ResourceDictionary>
        <app:StringTruncator x:Key="StringTruncator" />
        <app:StringTruncatorFav x:Key="StringTruncatorFav" />        
        <app:AppInfo x:Key="AppInfo" />
        <app:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter" /       
    </ResourceDictionary>

</Application.Resources>

然后在UserControl XML中,我通过此代码

引用它
<Grid x:Name="LayoutRoot" Background="{StaticResource PhoneChromeBrush}">
    <TextBlock TextWrapping="NoWrap" x:Name="txtPageTitle" 
            Text="{Binding BrowserViewModel.PageTitle, Converter={StaticResource StringTruncator}}" 
            FontSize="{StaticResource PhoneFontSizeSmall}"    
            VerticalAlignment="Top"/>

StringTruncator是一个简单的转换器,如果字符串超过一定长度,则附加...

namespace Tabbed_Browser
{
public class StringTruncator : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value == null)
            return ""; 

        string str = value.ToString();
        int maxChars = 44;
        return str.Length <= maxChars ? str : str.Substring(0, maxChars) + "...";
    }

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

}

然后我运行项目我得到以下内容。删除代码中的StringTruncator转换器消除了错误,但我需要使用转换器。我错过了什么?

{System.Windows.Markup.XamlParseException:
 Cannot find a Resource with the Name/Key StringTruncator [Line: 15 Position: 22]
  at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
  at Tabbed_Browser.User_Controls.UCAddressBar.InitializeComponent()
  at Tabbed_Browser.User_Controls.UCAddressBar..ctor()}

1 个答案:

答案 0 :(得分:0)

您应该使用 DynamicResource ,这样它将在运行时应用。或者您可以向Usercontrol.Resources本身添加资源。或者您也可以这样做,但您还必须将命名空间添加到UserControl:

  Text="{Binding BrowserViewModel.PageTitle, Converter={app:StringTruncator}}"