WPF 绑定到两个属性
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WPF binding to two properties
提问by mo alaz
I have a WPF control that has a Messageproperty.
我有一个具有Message属性的 WPF 控件。
I currently have this:
我目前有这个：
<dxlc:LayoutItem >
<local:Indicator Message="{Binding PropertyOne}" />
</dxlc:LayoutItem>
But i need that Messageproperty to be bound to two properties.
但我需要将该Message属性绑定到两个属性。
Obviously can't be done like this, but this can help explain what it is I want:
显然不能这样做，但这可以帮助解释我想要的是什么：
<dxlc:LayoutItem >
<local:Indicator Message="{Binding PropertyOne && Binding PropertyTwo}" />
</dxlc:LayoutItem>
回答by adPartage
<TextBlock.Text>
<MultiBinding StringFormat="{}{0} {1}">
<Binding Path="FirstName"/>
<Binding Path="LastName"/>
</MultiBinding>
</TextBlock.Text>
回答by Anatoliy Nikolaev
Try use the MultiBinding:
尝试使用MultiBinding：
Describes a collection of Binding objects attached to a single binding target property.
描述附加到单个绑定目标属性的 Binding 对象的集合。
Example:
例子：
XAML
XAML
<TextBlock>
<TextBlock.Text>
<MultiBinding Converter="{StaticResource myNameConverter}"
ConverterParameter="FormatLastFirst">
<Binding Path="FirstName"/>
<Binding Path="LastName"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
Converter
Converter
public class NameConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
string name;
switch ((string)parameter)
{
case "FormatLastFirst":
name = values[1] + ", " + values[0];
break;
case "FormatNormal":
default:
name = values[0] + " " + values[1];
break;
}
return name;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
string[] splitValues = ((string)value).Split(' ');
return splitValues;
}
}
回答by Rohit Vats
You can't do Andoperation in XAML.
您不能And在 XAML 中进行操作。
Create wrapper property in your view model class which will return and of two properties and bind with that property instead.
在您的视图模型类中创建包装器属性，它将返回两个属性的 和 并改为与该属性绑定。
public bool UnionWrapperProperty
{
get
{
return PropertyOne && PropertyTwo;
}
}
XAML
XAML
<local:Indicator Message="{Binding UnionWrapperProperty}" />
Another approach would be to use MultiValueConverter. Pass two properties to it and return And value from the converter instead.
另一种方法是使用MultiValueConverter. 将两个属性传递给它并从转换器返回 And 值。
