WPF binding to two properties

Question

I have a WPF control that has a Message property.

I currently have this:

 <dxlc:LayoutItem >
            <local:Indicator Message="{Binding PropertyOne}" />
 </dxlc:LayoutItem>

But i need that Message property to be bound to two properties.

Obviously can't be done like this, but this can help explain what it is I want:

<dxlc:LayoutItem >
            <local:Indicator Message="{Binding PropertyOne && Binding PropertyTwo}" />
 </dxlc:LayoutItem>

Possible duplicate: https://stackoverflow.com/q/2552853/1518546 — John Cummings, Dec 12 '17 at 18:11

score 43 · Answer 1 · answered May 24 '17 at 08:09

43

<TextBlock.Text>
    <MultiBinding StringFormat="{}{0} {1}">
        <Binding Path="FirstName"/>
        <Binding Path="LastName"/>
    </MultiBinding>
</TextBlock.Text>

answered May 24 '17 at 08:09

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simply the best!! – iamraviraj Jul 12 '17 at 10:54
How to format some string binding? I have field `TimeSpan` then `` but it not work – Trương Quốc Khánh Sep 12 '20 at 08:19

score 40 · Accepted Answer · answered Apr 22 '14 at 16:59

Try use the MultiBinding:

Describes a collection of Binding objects attached to a single binding target property.

Example:

XAML

<TextBlock>
   <TextBlock.Text>
       <MultiBinding Converter="{StaticResource myNameConverter}"
                     ConverterParameter="FormatLastFirst">
          <Binding Path="FirstName"/>
          <Binding Path="LastName"/>
       </MultiBinding>
   </TextBlock.Text>
</TextBlock>

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;
    }
}

That is a horribly verbose way to achieve this. – The Muffin Man Oct 13 '17 at 18:06 — The Muffin Man, Oct 13 '17 at 18:06

Rohit Vats · Answer 3 · 2014-04-22T17:23:38.290

8

You can't do And operation in XAML.

Create wrapper property in your view model class which will return and of two properties and bind with that property instead.

public bool UnionWrapperProperty
{
   get
   {
      return PropertyOne && PropertyTwo;
   }
}

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.

edited Apr 22 '14 at 17:23

answered Apr 22 '14 at 17:00

Rohit Vats

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What you have posted isn't a `Bitwise AND`. It's just an `AND` operator. In any case, I think he wanted whatever the type is, concatenated. – gleng Apr 22 '14 at 17:18
2

Yeah. But OP haven't mentioned anything in question and since we can't `&&` strings (or all types). So, was just assuming OP wants bool property. Will update once OP clears the picture. – Rohit Vats Apr 22 '14 at 17:22

WPF binding to two properties

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