C# WPF：将标签绑定到类属性
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WPF: Binding a Label to a class property
提问by Gareth
I'm trying to get the content of a label to bind to the string property of a class instance without much success.
我试图获取标签的内容以绑定到类实例的字符串属性，但没有取得多大成功。
XAML:
XAML：
<Window x:Class="WPFBindingTest.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>
<Label Height="28" Margin="12,55,106,0" Name="label1" Background="Bisque"
Content="{Binding Source=MyFoo, Path=W1}" VerticalAlignment="Top" />
<Label Height="28" Margin="12,12,106,0" Name="label2" Background="Bisque"
Content="{Binding Source=MyFoo, Path=W2}" VerticalAlignment="Top" />
<Button Height="23" HorizontalAlignment="Right" Margin="0,0,32,48"
Name="button1" VerticalAlignment="Bottom" Width="89"
Click="button1_Click">
Set Properties
</Button>
</Grid>
</Window>
C#:
C＃：
namespace WPFBindingTest
{
public partial class Window1 : Window
{
public Foo MyFoo;
public Window1()
{
InitializeComponent();
MyFoo = new Foo();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
MyFoo.W1 = "Hello";
MyFoo.W2 = "Dave";
}
}
public class Foo
{
public string W1 { get; set; }
public string W2 { get; set; }
}
}
i.e. when I click the button, I set the properties of MyFoo to "Hello" and "Dave", and want that reflected in the labels on the UI. I've set the Content as a binding but something isn't right. What am I doing wrong here?
即当我单击按钮时，我将 MyFoo 的属性设置为“Hello”和“Dave”，并希望将其反映在 UI 上的标签中。我已将内容设置为绑定，但有些不对劲。我在这里做错了什么？
采纳答案by Vlad
You may make your MyFooa dependency property and set the DataContextto your Window1instance:
您可以创建MyFoo一个依赖属性并将其设置DataContext为您的Window1实例：
<Window DataContext="{Binding RelativeSource={RelativeSource Self}}" ...>
See this articlefor more details.
有关更多详细信息，请参阅此文章。
Making MyFooa dependency property is not compulsory. it may work with just a property if you set the property value beforeassigning the DataContext. (But never with a field.) However if you want the labels to pick up the changing values of W1and W2(or you don't know/care if the values are set before or after assigning the DataContect), you need Footo be either a DependencyObject, or implement interface INotifyPropertyChanged.
制作MyFoo依赖属性不是强制性的。如果您在分配DataContext. （但永远不要使用字段。）但是，如果您希望标签获取W1和的变化值W2（或者您不知道/关心这些值是在分配 之前还是之后设置的DataContect），则您需要Foo成为DependencyObject,或实现接口INotifyPropertyChanged。
回答by Arcturus
Or give your Window a name: like NameOfWindowand use a ElementName binding:
或者给你的 Window 一个名字：喜欢NameOfWindow并使用一个 ElementName 绑定：
Content="{Binding ElementName=NameOfWindow, Path=MyFoo.W1}"
Complete sample XAML:
完整的示例 XAML：
<Window x:Class="WPFBindingTest.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" Name="NameOfWindow">
<Grid>
<Label Height="28" Margin="12,55,106,0" Name="label1" Background="Bisque" Content="{Binding ElementName=NameOfWindow, Path=MyFoo.W1}" VerticalAlignment="Top" />
<Label Height="28" Margin="12,12,106,0" Name="label2" Background="Bisque" Content="{Binding ElementName=NameOfWindow, Path=MyFoo.W2}" VerticalAlignment="Top" />
<Button Height="23" HorizontalAlignment="Right" Margin="0,0,32,48" Name="button1" VerticalAlignment="Bottom" Width="89" Click="button1_Click">Set Properties</Button>
</Grid>
