WPF 简单绑定到 INotifyPropertyChanged 对象
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/17967052/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
WPF Simple Binding to INotifyPropertyChanged Object
提问by orberkov
I've created the simplest binding. A textbox bound to an object in the code behind.
我已经创建了最简单的绑定。绑定到后面代码中的对象的文本框。
Event though - the textbox remains empty.
事件 - 文本框保持为空。
The window's DataContext is set, and the binding path is present.
设置了窗口的 DataContext，并且存在绑定路径。
Can you say what's wrong?
你能说有什么问题吗？
XAML
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>
Code behind
背后的代码
public partial class SimpleBinding : Window
{
public Book TheBook;
public SimpleBinding()
{
TheBook = new Book() { BookName = "The Mythical Man Month" };
InitializeComponent();
}
}
The book object
本书对象
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");
}
}
}
}
采纳答案by dkozl
First of all remove DataContext="MainWindow"as this sets DataContextof a Windowto a stringMainWindow, then you specify ElementNamefor your binding which defines binding source as another control with x:Name="TheBook"which does not exist in your Window. You can make your code work by removing ElementName=TheBookfrom your binding and either by assigning DataContext, which is default source if none is specified, of a Windowto TheBook
首先DataContext="MainWindow"将DataContextaWindow设置为stringMainWindow，然后ElementName为您的绑定指定绑定源，该绑定将绑定源定义为另一个控件，x:Name="TheBook"该控件在您的Window. 您可以通过删除使你的代码的工作ElementName=TheBook由指定的结合，要么DataContext，如果没有指定，这是默认信号源的Window来TheBook
public SimpleBinding()
{
...
this.DataContext = TheBook;
}
or by specifying RelativeSourceof your binding to the Windowwhich exposes TheBook:
或通过指定RelativeSource您的绑定到Windowwhich 暴露TheBook：
<TextBox Text="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window}}, Path=TheBook.BookName}"/>
but since you cannot bind to fields you will need to convert TheBookinto property:
但由于您无法绑定到字段，因此您需要转换TheBook为属性：
public partial class SimpleBinding : Window
{
public Book TheBook { get; set; }
...
}
