wpf字典绑定,其中key=变量
我有一本测试字典wpf字典绑定,其中key=变量,wpf,binding,dictionary,Wpf,Binding,Dictionary,我有一本测试字典 MyDict = new Dictionary<string, Uri> { {"First", new Uri("alma.jpg", UriKind.Relative)}, {"Second", new Uri("korte.jpg", UriKind.Relative)} }; MyDict=新字典 { {“First”,新Uri(“alma.jpg”,UriKind.Relative)}, {“Second”,新Uri(“korte.jpg
MyDict = new Dictionary<string, Uri>
{
{"First", new Uri("alma.jpg", UriKind.Relative)},
{"Second", new Uri("korte.jpg", UriKind.Relative)}
};
MyDict=新字典
{
{“First”,新Uri(“alma.jpg”,UriKind.Relative)},
{“Second”,新Uri(“korte.jpg”,UriKind.Relative)}
};
和一个简单的XAML
<TextBlock Text="{Binding MyDict[First]}"
FontSize="13" Width="200" Height="30" />
这完美地显示了第一个关键元素值
我想要的是
我有一个字符串变量:DictKey
让我们使用DictKey=“First”
如何重写XAML以使用此变量
<TextBlock Text="{Binding MyDict[???DictKey????]}"
FontSize="13" Width="200" Height="30" />
thx.我假设您有一些属性
DictKey
,它保存项目的键。
您可以使用MultiBinding
并使用项的键设置字典属性的第一个绑定和属性的第二个绑定:
<TextBlock FontSize="13" Width="200" Height="30">
<TextBlock.Text>
<MultiBinding>
<MultiBinding.Converter>
<local:DictionaryItemConverter/>
</MultiBinding.Converter>
<Binding Path="MyDict"/>
<Binding Path="DictKey"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
请参阅有关如何格式化代码块的信息。
public class DictionaryItemConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (values != null && values.Length >= 2)
{
var myDict = values[0] as IDictionary;
var myKey = values[1] as string;
if (myDict != null && myKey != null)
{
//the automatic conversion from Uri to string doesn't work
//return myDict[myKey];
return myDict[myKey].ToString();
}
}
return Binding.DoNothing;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
throw new NotSupportedException();
}
}