如何将xaml绑定到来自其他类的文本框

debugcn 发表于 Dev

责备

我可以在后面的代码中找出如何将属性绑定到文本框，但是对于我当前的应用程序，我需要从其他类绑定到属性。这是我所拥有的简化版本：

<Window x:Class="Project1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
<Grid>
    <TextBox x:Name="Textbox1" Text="{Binding Class1.Class2.TextToBind, Mode=TwoWay}" Height="20"  Width="75" Background="#FFE5E5E5"/>
</Grid>

代码背后：

namespace Project1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            Class1 = new Class1();
        }
        public Class1 Class1 { get; set; }
    }
}

第1类：

namespace Project1
{
    public class Class1
    {
        public Class1()
        {
            Class2 = new Class2();
        }
        public Class2 Class2 { get; set; }
    }
}

期末课程：

namespace Project1
{
    public class Class2
    {
        public Class2()
        {
        }
        private string textToBind;
        public string TextToBind { get { return textToBind; } set { SetProperty(ref textToBind, value); } }

        public event PropertyChangedEventHandler PropertyChanged;
        private void SetProperty<T>(ref T field, T value, [CallerMemberName] string name = "")
        {
            if (!EqualityComparer<T>.Default.Equals(field, value))
            {
                field = value;
                var handler = PropertyChanged;
                if (handler != null)
                {
                    handler(this, new PropertyChangedEventArgs(name));
                }
            }
        }
    }
}

瓦马列夫

您必须为您的TextBox或Window设置DataContext

namespace Project1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            Class1 = new Class1();


            Class1.Class2.TextToBind = "Test";

            this.DataContext = this;
        }
        public Class1 Class1 { get; set; }
    }
}

另外，您还需要从INotifyPropertyChanged继承Class2：

public class Class2 : INotifyPropertyChanged
{
    public Class2()
    {
    }
    private string textToBind;
    public string TextToBind { get { return textToBind; } set { SetProperty(ref textToBind, value); } }

    public event PropertyChangedEventHandler PropertyChanged;
    private void SetProperty<T>(ref T field, T value, [CallerMemberName] string name = "")
    {
        if (!EqualityComparer<T>.Default.Equals(field, value))
        {
            field = value;
            var handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(name));
            }
        }
    }
}

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