C WPF将枚举绑定到组合框

如果希望能够简单地从xaml绑定枚举,可以编写标记扩展类。前段时间我写了一篇关于它的博文: http://simonkatanski.blogspot.com/2013/02/enum-combobox-using-markupextension.html

代码如下:

public class EnumValuesExtension : MarkupExtension
{
    private Type _enumType;
    private String _resourceName;
    private bool _addEmptyValue = false;
    // Enumeration type
    public Type EnumType
    {
        set { _enumType = value; }
    }
    // Name of the class of the .resx file        
    public String ResourceName
    {
        set { _resourceName = value; }
    }
    // Add empty value flag        
    public Boolean AddEmptyValue
    {
        set { _addEmptyValue = value; }
    }
    public EnumValuesExtension()
    {
    }

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        // Enumeration type not passed through XAML
        if (_enumType == null)
            throw new ArgumentNullException("EnumType (Property not set)");
        if (!_enumType.IsEnum)
            throw new ArgumentNullException("Property EnumType must be an enum");
        // Bindable properties list
        List<dynamic> list = new List<dynamic>();

        if (!String.IsNullOrEmpty(_resourceName))
        {
            // Name of the resource class
            Type type = Type.GetType(_resourceName);
            if (type == null)
                throw new ArgumentException(
                    "Resource name should be a fully qualified name");
            // We iterate through the Enum values
            foreach (var enumName in Enum.GetNames(_enumType))
            {
                string translation = string.Empty;
                var property = type.GetProperty(enumName,
                    BindingFlags.Static |
                    BindingFlags.Public |
                    BindingFlags.NonPublic);
                // If there's not translation for specific Enum value,
                // there'll be a message shown instead
                if (property == null)
                    translation = String.Format(
                        "Field {0} not found in the resource file {1}",
                        enumName,
                        _resourceName);
                else
                    translation = property.GetValue(null, null).ToString();

                list.Add(GetNamed(translation, enumName));
            }
            // Adding empty row
            if (_addEmptyValue)
                list.Add(GetEmpty());
            return list;
        }
        // If there's no resource provided Enum values will be used
        // without translation
        foreach (var enumName in Enum.GetNames(_enumType))
            list.Add(GetNamed(enumName, enumName));

        if (_addEmptyValue)
            list.Add(GetEmpty());

        return list;
    }

    // Create one item which will fill our ComboBox ItemSource list
    private dynamic GetNamed(string translation, string enumName)
    {
        // We create a bindable context
        dynamic bindableResult = new ExpandoObject();
        // This dynamically created property will be
        // bindable from XAML (through DisplayMemberPath or wherever)
        bindableResult.Translation = translation;
        // We're setting the value, which will be passed to SelectedItem
        // of the ComboBox
        bindableResult.Enum = enumName;
        return bindableResult;
    }

    // Create one empty item which will fill our ComboBox ItemSource list
    private dynamic GetEmpty()
    {
        dynamic bindableResult = new ExpandoObject();
        bindableResult.Translation = String.Empty;
        bindableResult.Enum = null;
        return bindableResult;
    }
}

您可以在代码中使用此类,如下所示:

<StackPanel>
<ComboBox Height="100" Width="200"
          SelectedValuePath="Enum" 
          DisplayMemberPath="Translation"
          ItemsSource="{Binding Source={local:EnumValues EnumType=local:TestEnum}}"
          Margin="98,0,76,0"
          SelectedValue="{Binding SelectedItemInYourViewModel}"/>
</StackPanel>

然后,您只需将枚举作为上述xaml中的枚举类型传递。这样就可以使用xaml中的枚举。

我粘贴在这里的版本和博客中的版本有额外的代码,用于组合中的热交换值及其翻译的等效值(如果您正在处理多语言应用程序),您应该能够轻松删除该代码。

我现在不知道具体情况,但我做的是这样的事情。

  enum WeekDay { Mon, Tues };
  Dictionary<string, WeekDay> dic = new Dictionary<string, WeekDay>();
  foreach (var v in WeekDay.Enumerate)  //this is not the correct syntax 
  {
      dic.Add(v.ToString(), v);
  }

装订字典;