WPF中基于组合框项目的文本框文本

Question

我在应用程序中使用一个组合框，其中的组合框项目为“是”和“否”。如果要选择组合框项目，则要将文本框的文本分配为“已清除”，如果选择了组合框项目“否”，则将其文本框分配为“未清除”。我在WPF上这样做

Answer 1

If you want to do it entirely in XAML, you could use an element binding on the TextBox (to the checkbox/combobox), and then implement a value converter to convert the Yes/No to the appropriate string.

Alternatively, if using MVVM, you could bind the checkbox IsChecked or combobox SelectedValue to a property on your view model, and in that properties setter, notify another property which is your text box text, which has just a getter which returns the appropriate string based on your first view model property. Bind your TextBox Text property to this new view model property.

Answer 2

Create an implementation of IValueConverter

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;

namespace XAMLConverter
{
    public class ComboBoxConverter : IValueConverter
    {


        object IValueConverter.Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            try
            {                
                if (value.ToString() == "Yes")
                    return "Cleared";
                else if (value.ToString() == "No")
                    return "Not Cleared";
                else
                    return "";

            }
            catch
            {
                return "";
            }
        }

        object IValueConverter.ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}

Add your namespace to the XAML for:

xmlns:conv="clr-namespace:XAMLConverter"

Add a resource for the converter:

<Window.Resources>        
    <conv:ComboBoxConverter x:Key="ComboBoxConverter" />        
</Window.Resources>

Then add your controls:

    <StackPanel>
        <ComboBox Name="SelectControl">
            <ComboBoxItem Content="Yes" />
            <ComboBoxItem Content="No" />
        </ComboBox>

        <TextBox Text="{Binding ElementName=SelectControl, 
                                Path=SelectedItem.Content, 
                                Converter={StaticResource ComboBoxConverter}}" 
        />

    </StackPanel>

Answer 3

Trigger solution goes here:

        <ComboBox Name="cb">
            <ComboBoxItem>Yes</ComboBoxItem>
            <ComboBoxItem>No</ComboBoxItem>
        </ComboBox>
        <TextBox>
            <TextBox.Style>
                <Style TargetType="TextBox">
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding ElementName=cb, Path=SelectedItem.Content}" Value="Yes">
                            <Setter Property="Text" Value="cleared"/>
                        </DataTrigger>
                        <DataTrigger Binding="{Binding ElementName=cb, Path=SelectedItem.Content}" Value="No">
                            <Setter Property="Text" Value="not cleared"/>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </TextBox.Style>
        </TextBox>