我可以从后面的C#代码更新WPF绑定的值吗？

Question

我正在学习C#并构建一个读取和写入整数到XML配置文件的UI.UI使用各种自定义用户控件.我有一个3 radiobutton用户控件绑定到单个int变量(控件返回0,1,2).控件使用事件来触发更新.它查看3个isChecked属性以确定新的int值.但我不知道如何从后面的代码更新原始绑定值.它曾被删除,因为有两个绑定..一个在主窗口中,一个在用户控件中.作为初学者,我在这一点上迷失了方向.BTW将int值读入3个radiobutton正在使用转换器.

这是用户控件xaml.cs ...

namespace btsRV7config.controls
{
    public partial class ui3X : UserControl
    {
        public ui3X()
        {
            InitializeComponent();
        }

        void _event(object sender, RoutedEventArgs e)
        {
            int newValue = 0;
            if (rdbttn1.IsChecked == true) { newValue = 0; }
            else if (rdbttn2.IsChecked == true) { newValue = 1; }
            else if (rdbttn3.IsChecked == true) { newValue = 2; }
            txtb.Text = newValue.ToString(); //tempRemove

            // !!! assign newValue to Binding Source !!!
            //---------------------------------------------
            uiBinding1 = newValue;
            BindingOperations.GetBindingExpression(rdbttn1, RadioButton.IsCheckedProperty).UpdateSource();
            //---------------------------------------------
        }

        public static readonly DependencyProperty uiBinding1Property = DependencyProperty.Register("uiBinding1", typeof(int), typeof(ui3X));
        public int uiBinding1
        {
            get { return (int)GetValue(uiBinding1Property); }
            set { SetValue(uiBinding1Property, value); }
        }

        public static readonly DependencyProperty uiBinding2Property = DependencyProperty.Register("uiBinding2", typeof(int), typeof(ui3X));
        public int uiBinding2
        {
            get { return (int)GetValue(uiBinding2Property); }
            set { SetValue(uiBinding2Property, value); }
        }

        public static readonly DependencyProperty uiBinding3Property = DependencyProperty.Register("uiBinding3", typeof(int), typeof(ui3X));
        public int uiBinding3
        {
            get { return (int)GetValue(uiBinding3Property); }
            set { SetValue(uiBinding3Property, value); }
        }
    }
}

这是用户控件xaml

<UserControl x:Class="btsRV7config.controls.ui3X"
             x:Name="root"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <StackPanel Orientation="Horizontal" Height="22">

        <RadioButton Name="rdbttn1" VerticalAlignment="Center" Margin="0 0 10 0"
                     IsChecked="{Binding ElementName=root, Path=uiBinding1}"
                     Click="_event" />

        <RadioButton Name="rdbttn2" VerticalAlignment="Center" Margin="0 0 10 0"
                     IsChecked="{Binding ElementName=root, Path=uiBinding2}"
                     Click="_event" />

        <RadioButton Name="rdbttn3" VerticalAlignment="Center"
                     IsChecked="{Binding ElementName=root, Path=uiBinding3}"
                     Click="_event" />

        <TextBox Name="txtb" Margin="5 0 0 0" Width="20" Height="17" /> <!-- tempRemove -->
    </StackPanel>
</UserControl>

这是MainWindow.xaml中使用的用户控件的示例

<Window x:Class="btsRV7config.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:controls="clr-namespace:btsRV7config.controls"
        xmlns:converter="clr-namespace:btsRV7config.converters"
        Title="Vans RV7 Configuration" Height="350" Width="525" >
    <Window.Resources>
        <converter:Int_Int_Bool_Converter x:Key="Int_Int_Bool" />
    </Window.Resources>

    <Grid>
        <controls:ui3X uiName="Font Color" ui1="Black" ui2="Green" ui3="Cyan"
                       uiBinding1="{Binding RV7sld_DFfontColor, Converter={StaticResource Int_Int_Bool}, ConverterParameter=0}"
                       uiBinding2="{Binding RV7sld_DFfontColor, Converter={StaticResource Int_Int_Bool}, ConverterParameter=1}"
                       uiBinding3="{Binding RV7sld_DFfontColor, Converter={StaticResource Int_Int_Bool}, ConverterParameter=2}" />
    </Grid>
</Window>

这是MainWindow.xaml.cs

namespace btsRV7config
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            record data = new record();
            DataContext = data;
        }
    }

    public class record : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        private int _RV7sld_DFfontColor = RV7sld_dict["DFfontColor"];
        public int RV7sld_DFfontColor
        {
            get
            { return _RV7sld_DFfontColor; }
            set
            {
                _RV7sld_DFfontColor = value;
                if (PropertyChanged != null)
                {
                    PropertyChanged(this, new PropertyChangedEventArgs("RV7sld_DFfontColor"));
                }
            }
        }
    }
}

很抱歉发布了这么多代码 - 我认为重要的是用户控制顶部的xaml.cs.

这是一个UI图片的链接.我简化了我发布的适合的代码. http://www.baytower.ca/photo/uiSample.jpg

所以 - '字体颜色'(RV7sld_DFfontColor)可以是黑色(0)绿色(1)青色(2)

丹尼

Answer 1

本BindingOperations类可以"强制",在任一方向的绑定更新.

假设X后面的代码中有一个字符串属性,并且TextBox在XAML中有一个绑定到该属性的:

// C#:
public string X { get; set; }

// XAML:
<TextBox Name="textBox1" Text="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=my:MainWindow, AncestorLevel=1}, Path=X}" />

要从中复制textBox1.Text以X执行以下操作:

BindingOperations.GetBindingExpression(textBox1, TextBox.TextProperty).UpdateSource();

要从中复制X以textBox1.Text执行以下操作:

BindingOperations.GetBindingExpression(textBox1, TextBox.TextProperty).UpdateTarget();