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Asked: 2026-05-10T23:00:04+00:00

I am trying to implement a wpf user control that binds a text box

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I am trying to implement a wpf user control that binds a text box to a list of doubles using a converter. How can i set the instance of user control to be the converter parameter?

the code for the control is shown below

Thanks 

<UserControl x:Class='BaySizeControl.BaySizeTextBox'     xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'     xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'       xmlns:local='clr-namespace:BaySizeControl'     >     <UserControl.Resources>         <local:BayListtoStringConverter x:Key='BaySizeConverter'/>     </UserControl.Resources>     <Grid>          <TextBox  Name='Textbox_baysizes'                    Text='{Binding RelativeSource={RelativeSource self},                                 Path=Parent.Parent.BaySizeItemsSource,                                  Converter={StaticResource BaySizeConverter}}'                   />     </Grid> </UserControl>
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  1. The parameters are for constants needed by your converter. To provide an object instance to your converter, you can use MultiBinding.

    Note: For this solution to work, you also need to modify your converter to implement IMultiValueConverter instead of IValueConverter. Fortunately, the modifications involved are fairly little. You will can add a validation for the number of values provided to your converter, 2 in your case.

    <TextBox Name='Textbox_baysizes'>     <TextBox.Text>         <MultiBinding Converter='{StaticResource BaySizeConverter}'>             <Binding RelativeSource='{RelativeSource self}' Path='Parent.Parent.BaySizeItemsSource'/>             <Binding ElementName='Textbox_baysizes'/>         </MultiBinding>     </TextBox.Text> </TextBox>
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