WPF：简单的TextBox数据绑定 [英] WPF: simple TextBox data binding

问题描述

我有这个类：

public partial class Window1 : Window
{
    public String Name2;

    public Window1()
    {
        InitializeComponent();
        Name2 = new String('a', 5);
        myGrid.DataContext = this;
    }

    // ...
}

我想在文本框中显示字符串 Name2 。

And I want to display the string Name2 in the textbox.

<Grid Name="myGrid" Height="437.274">
  <TextBox Text="{Binding Path=Name2}"/>
</Grid>

但是字符串不显示。另外，如果使用 TimerCallback 定期更新字符串 Name2 ，那么我需要做任何事情来确保文本框数据更改时更新？

But the string isn't displayed. Also, if the string Name2 is updated periodically using a TimerCallback, do I need to do anything to make sure the textbox is updated when the data changes?

推荐答案

Name2是一个字段。 WPF仅绑定到属性。更改为：

Name2 is a field. WPF binds only to properties. Change it to:

public string Name2 { get; set; }

<因此，对于您的计时器更新情况，您需要实现INotifyPropertyChanged：

Be warned that with this minimal implementation, your TextBox won't respond to programmatic changes to Name2. So for your timer update scenario, you'll need to implement INotifyPropertyChanged:

partial class Window1 : Window, INotifyPropertyChanged
{
  public event PropertyChangedEventHandler PropertyChanged;

  // usual OnPropertyChanged implementation

  private string _name2;

  public string Name2
  {
    get { return _name2; }
    set
    {
      if (value != _name2)
      {
         _name2 = value;
         OnPropertyChanged("Name2");
      }
    }
  }
}

你应考虑将其移动到单独的数据对象而不是Window类。

You should consider moving this to a separate data object rather than on your Window class.

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