我应该转换参数是此绑定 [英] What should the converter parameter be for this binding

问题描述

我想实现一个WPF用户控件结合一个文本框，使用转换器双打的名单。如何设置用户控件的实例是转换器的参数？

在code为控制如下所示

感谢

 ＆LT;用户控件X：类=BaySizeControl.BaySizeTextBox
    的xmlns =htt​​p://schemas.microsoft.com/winfx/2006/xaml/$p$psentation
    的xmlns：X =htt​​p://schemas.microsoft.com/winfx/2006/xaml
    XMLNS：地方=CLR的命名空间：BaySizeControl
    ＆GT;
    ＆LT; UserControl.Resources＆GT;
        ＆LT;地方：BayListtoStringConverter X：关键=BaySizeConverter/＆GT;
    ＆LT; /UserControl.Resources>
    ＆LT;电网＆GT;

        ＆LT;文本框名称=Textbox_baysizes
                  文本={绑定的RelativeSource = {的RelativeSource自我}，
                                路径= Parent.Parent.BaySizeItemsSource，
                                变换器= {的StaticResource BaySizeConverter}}
                  /＆GT;
    ＆LT; /网格＆GT;
＆LT; /用户控件＆GT;
 

解决方案

该参数是需要你的转换常数。为了提供一个对象实例到你的转换器，你可以使用MultiBinding。

注：对于此解决方案的工作，你还需要修改你的转换器来实现IMultiValueConverter代替的IValueConverter。幸运的是，所涉及的修改是相当小。您将可以添加一个验证你的情况提供给你的转换器，2值的数量。

 ＆LT;文本框名称=Textbox_baysizes＆GT;
    ＆LT; TextBox.Text＆GT;
        ＆LT; MultiBinding转换器={的StaticResource BaySizeConverter}＆GT;
            ＆LT;绑定的RelativeSource ={的RelativeSource自我}路径=Parent.Parent.BaySizeItemsSource/＆GT;
            ＆LT;绑定的ElementName =Textbox_baysizes/＆GT;
        ＆LT; / MultiBinding＆GT;
    ＆LT; /TextBox.Text>
＆LT; /文本框＆GT;
 

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>

解决方案

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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