[英]WPF Binding To Single List Item Using Element Property As Index Value
I'm trying to bind to a single item from a collection but I need to be able to pass in a value from the element as the index. 我试图绑定到集合中的单个项目,但我需要能够将元素中的值作为索引传递。 Below is a sample of what I'm trying to accomplish. 以下是我要完成的示例。
ViewModel 视图模型
public Dictionary<string, string> ListOfString = new Dictionary<string, string>
{
{"0", "TextToDisplay" }
};
View 视图
<TextBox Tag="0" Text="{Binding ListOfString[Self.Tag]}" />
I'm not sure how to get the value of TextBox.Tag
and pass it to ListOfString
我不确定如何获取TextBox.Tag
的值并将其传递给ListOfString
You could use a MultivalueConverter
in which you will pass the ListOfStrings
Dictionary
and the Tag
property of the TextBox
like so: 你可以使用一个MultivalueConverter
中,你将通过ListOfStrings
Dictionary
和Tag
的财产TextBox
,如下所示:
<Window.Resources>
<ns:ValuFromDicConverter x:Key="ValuFromDicConverter"/>
</Window.Resources>
<Grid>
<TextBox Tag="0" x:Name="tb">
<TextBox.Text>
<MultiBinding Converter="{StaticResource ValuFromDicConverter}">
<Binding Path="ListOfString"/>
<Binding ElementName="tb" Path="Tag"></Binding>
</MultiBinding>
</TextBox.Text>
</TextBox>
</Grid>
the converter will simply get the corresponding value in the Dictionary
: 转换器将简单地在Dictionary
获得相应的值:
public class ValuFromDicConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
if (values == null) return null;
return (values[0] as Dictionary<string, string>)[values[1].ToString()];
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
and don't forget to define your dictionary as a property and set the DataContext
并且不要忘记将字典定义为属性并设置DataContext
private Dictionary<string, string> _listOfString = new Dictionary<string, string>
{
{"0", "TextToDisplay" }
};
public Dictionary<string, string> ListOfString
{
get
{
return _listOfString;
}
set
{
if (_listOfString.Equals(value))
{
return;
}
_listOfString = value;
}
}
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