c# - 无法使用 MVVM 架构将数据绑定(bind)到文本框？

Question

我是 MVVM 和 WPF 的新手。我尝试使用 DataContext 将数据绑定(bind)到文本框。

型号:MyMessage.cs

public class MyMessage : INotifyPropertyChanged
{
    private string testMessage;
    public string TestMessage
    {
        get { return testMessage; }
        set
        {
            testMessage = value;
            OnPropertyChanged("TestName");
        }
    }
    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

ViewModel:MainViewModel.cs

class MainViewModel
{
    MyMessage myMessage;
    public MainViewModel()
    {
        myMessage = new MyMessage();
        myMessage.TestMessage="Hai";
    }

查看:MainWindow.xaml

<Window x:Class="DemoApp2.Views.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <TextBox HorizontalAlignment="Left" Height="23" Margin="10,10,0,0" TextWrapping="Wrap" Text="{Binding TestMessage}" VerticalAlignment="Top" Width="120"/>
</Grid>

Answer 1

您需要将“myMessage”转换为属性，并将其绑定(bind)为MyMessage.TestMessage在您的 TextBox ，假设您绑定(bind) MainViewModel如DataContext在 Window .