WPF属性数据绑定以取消属性

问题描述

在WPF数据绑定中有什么办法可以改变运行时的属性值。假设我的TextBox绑定到IsAdmin属性。有没有办法我可以改变XAML中的属性值是！IsAdmin。

我只是想否定属性，所以Valueconverter可能是一个过分的！ b
$ b

注意：不使用ValueConverter

解决方案

您可以使用。

  [ValueConversion（typeof（bool），typeof（bool））] 
 public class InvertBooleanConverter：IValueConverter 
 {
 public object Convert（object value，Type targetType，object parameter，CultureInfo culture）
 {
 bool original =（bool）value; 
 return！original; 
} 
 
 public object ConvertBack（object value，Type targetType，object parameter，CultureInfo culture）
 {
 bool original =（bool）value; 
 return！original; 
} 
} 
  

然后，您将设置如下绑定： p>

 < TextBlock Text ={Binding Path = IsAdmin，Converter = {StaticResource boolConvert}}/> 
  

添加资源（通常在您的UserControl / Window中），如下所示：

 < local：InvertBooleanConverter x：Key =boolConvert/> 
  

---

编辑响应评论：

如果你想避免某种原因的值转换器（虽然我觉得这是最合适的地方），你可以直接在ViewModel中进行转换。只需添加一个属性：

  public bool IsRegularUser 
 {
 get {return！this.IsAdmin; } 
} 
  

但是，如果这样做，请确保您的 IsAdmin 属性setter还为IsRegularUser以及IsAdmin引发了一个 PropertyChanged 事件，所以UI会相应地更新。

Is there any way to change the value of property at runtime in WPF data binding. Let's say my TextBox is bind to a IsAdmin property. Is there anyway I can change that property value in XAML to be !IsAdmin.

I just want to negate the property so Valueconverter might be an overkill!

NOTE: Without using ValueConverter

解决方案

You can use an IValueConverter.

[ValueConversion(typeof(bool), typeof(bool))]
public class InvertBooleanConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        bool original = (bool)value;
        return !original;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        bool original = (bool)value;
        return !original;
    }
}

Then you'd setup your binding like:

<TextBlock Text="{Binding Path=IsAdmin, Converter={StaticResource boolConvert}}" />

Add a resource (usually in your UserControl/Window) like so:

<local:InvertBooleanConverter  x:Key="boolConvert"/>

---

Edit in response to comment:

If you want to avoid a value converter for some reason (although I feel that it's the most appropriate place), you can do the conversion directly in your ViewModel. Just add a property like:

public bool IsRegularUser
{
     get { return !this.IsAdmin; }
}

If you do this, however, make sure your IsAdmin property setter also raises a PropertyChanged event for "IsRegularUser" as well as "IsAdmin", so the UI updates accordingly.

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