WPF：如何在Xaml中使用枚举填充组合框 [英] WPF: How to populate combobox with enum in Xaml

问题描述

我知道有几种方法可以做到这一点，但是如果可能的话我想让它更容易，因为我有很多组合框以这种方式绑定。有一个使用ObjectDataProvider here 的建议。问题是我必须为每个枚举创建一个资源条目，这很多。到目前为止，我一直在使用代码隐藏方式，因为它更短：

  cmb.ItemsSource = Enum.GetValues（typeof （MyTypes））; 
  

我想知道是否可以在Xaml中生成等价物。我以为我们可以使用转换器归档这个。我们可以将类型转换为数组，然后将数组绑定到组合框'ItemsSource。但是，我一直坚持如何将转换器的枚举指定给我。这是我的代码：

我的枚举：

  public enum MyTypes {Type1，Type2，Type3}; 
  

这是我的转换器：

  public class EnumToArrayConverter：IValueConverter 
 {
 public object Convert（object value，Type targetType，object parameter，System.Globalization.CultureInfo culture）
 {
返回Enum.GetValues（value.GetType（））; 
} 
 
 public object ConvertBack（object value，Type targetType，object parameter，System.Globalization.CultureInfo culture）
 {
 return null; //我不在乎这个
} 
} 
  

我的Xaml资源：

 < lib：EnumToArrayConverter x：Key =E2A/> 
  

以下是如何使用它：

 < ComboBox SelectedItem ={Binding MyType}ItemsSource ={Binding MyTypes，Converter = {StaticResource E2A}}/> 
  

所以，我的问题是如何将我的枚举MyTypes指定给转换器。我也试图预先命名空间，但这并没有帮助。

解决方案

http：// html = .wordpress.com / 2008/07/08 / enum-getvalues-markup-extension /rel =noreferrer>这个。

I know there are several ways to do it, but I would like to make it even easier if possible because I have a lot of comboboxes to bind in this way. There is a suggestion using ObjectDataProvider here. The problem is that I have to create a resource entry for each enum and that's a lot. So far, I have been using the code-behind way because it's much shorter:

cmb.ItemsSource = Enum.GetValues(typeof(MyTypes));

I'm wondering if an equivalent can be produced in Xaml. I thought we could archive this by using a converter. We could convert the type to an array and then bind the array to combobox' ItemsSource. But I got stuck on how to specify my enum to the converter. Here is my code:

My enum:

public enum MyTypes { Type1, Type2, Type3 }; 

This is my converter:

public class EnumToArrayConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return Enum.GetValues(value.GetType());
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return null; // I don't care about this
    }
}

My Xaml Resource:

<lib:EnumToArrayConverter x:Key="E2A"/>

Here is how to use it:

<ComboBox SelectedItem="{Binding MyType}" ItemsSource="{Binding MyTypes, Converter={StaticResource E2A}}"/>

So, my question is how to specify my enum "MyTypes" to the converter. I also tried to prepend namespace, but it doesn't help.

解决方案

You would be better off with a MarkupExtension, like this one.

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