我创建了最简单的绑定。绑定到后面代码中的对象的文本框。
事件 - 文本框仍为空。
设置窗口的DataContext,并且存在绑定路径。
你能说出错了吗?
XAML
<Window x:Class="Anecdotes.SimpleBinding"
x:Name="MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="SimpleBinding" Height="300" Width="300" DataContext="MainWindow">
<Grid>
<TextBox Text="{Binding Path=BookName, ElementName=TheBook}" />
</Grid>
</Window>
背后的代码
public partial class SimpleBinding : Window
{
public Book TheBook;
public SimpleBinding()
{
TheBook = new Book() { BookName = "The Mythical Man Month" };
InitializeComponent();
}
}
书籍对象
public class Book : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(name));
}
}
private string bookName;
public string BookName
{
get { return bookName; }
set
{
if (bookName != value)
{
bookName = value;
OnPropertyChanged("BookName");
}
}
}
}
答案 0 :(得分:4)
首先删除DataContext="MainWindow"
,因为这会将DataContext
的{{1}}设置为Window
MainWindow ,然后指定string
您的绑定将绑定源定义为另一个ElementName
的控件,x:Name="TheBook"
中不存在该控件。您可以通过从绑定中删除Window
来使代码生效,并指定ElementName=TheBook
,DataContext
,如果没有指定,则为Window
到TheBook
public SimpleBinding()
{
...
this.DataContext = TheBook;
}
或指定RelativeSource
绑定到Window
TheBook
的{{1}}:
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}, Path=TheBook.BookName}"/>
但由于您无法绑定到字段,因此需要将TheBook
转换为属性:
public partial class SimpleBinding : Window
{
public Book TheBook { get; set; }
...
}