C# 如何以编程方式绑定到静态属性?
如何以编程方式绑定到静态属性?我可以用C#来做什么 更新:是否可以执行单向源绑定?我知道双向是不可能的,因为静态对象上没有更新事件(至少在.NET4中是这样)。我无法实例化对象,因为它是静态的。单向绑定 假设您有一个带有静态属性C# 如何以编程方式绑定到静态属性?,c#,.net,wpf,xaml,data-binding,C#,.net,Wpf,Xaml,Data Binding,如何以编程方式绑定到静态属性?我可以用C#来做什么 更新:是否可以执行单向源绑定?我知道双向是不可能的,因为静态对象上没有更新事件(至少在.NET4中是这样)。我无法实例化对象,因为它是静态的。单向绑定 假设您有一个带有静态属性Name的类Country public class Country { public static string Name { get; set; } } 现在您需要将属性Name绑定到TextBlock的TextProperty Binding binding
Name
的类Country
public class Country
{
public static string Name { get; set; }
}
现在您需要将属性Name
绑定到TextBlock
的TextProperty
Binding binding = new Binding();
binding.Source = Country.Name;
this.tbCountry.SetBinding(TextBlock.TextProperty, binding);
更新:双向绑定
Country
类如下所示:
public static class Country
{
private static string _name;
public static string Name
{
get { return _name; }
set
{
_name = value;
Console.WriteLine(value); /* test */
}
}
}
现在我们希望将此属性名称
绑定到文本框
,因此:
Binding binding = new Binding();
binding.Source = typeof(Country);
binding.Path = new PropertyPath(typeof(Country).GetProperty("Name"));
binding.Mode = BindingMode.TwoWay;
binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
this.tbCountry.SetBinding(TextBox.TextProperty, binding);
如果要更新目标,必须使用BindingExpression
和函数UpdateTarget
:
Country.Name = "Poland";
BindingExpression be = BindingOperations.GetBindingExpression(this.tbCountry, TextBox.TextProperty);
be.UpdateTarget();
您总是可以编写一个非静态类来提供对静态类的访问 静态类:
namespace SO.Weston.WpfStaticPropertyBinding
{
public static class TheStaticClass
{
public static string TheStaticProperty { get; set; }
}
}
非静态类提供对静态属性的访问
namespace SO.Weston.WpfStaticPropertyBinding
{
public sealed class StaticAccessClass
{
public string TheStaticProperty
{
get { return TheStaticClass.TheStaticProperty; }
}
}
}
绑定很简单:
<Window x:Class="SO.Weston.WpfStaticPropertyBinding.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:SO.Weston.WpfStaticPropertyBinding"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<local:StaticAccessClass x:Key="StaticAccessClassRes"/>
</Window.Resources>
<Grid>
<TextBlock Text="{Binding Path=TheStaticProperty, Source={StaticResource ResourceKey=StaticAccessClassRes}}" />
</Grid>
</Window>
<Window x:Class="SO.Weston.WpfStaticPropertyBinding.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:SO.Weston.WpfStaticPropertyBinding"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<local:StaticAccessClass x:Key="StaticAccessClassRes"/>
</Window.Resources>
<Grid>
<TextBlock Text="{Binding Path=TheStaticProperty, Source={StaticResource ResourceKey=StaticAccessClassRes}}" />
</Grid>
</Window>