Created
September 16, 2013 09:14
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WPF EnumItemsSource
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/// <summary> | |
/// Allows us to use enum values as a data source; e.g. for providing as an ItemsSource | |
/// on a combo box control for user selection. | |
/// </summary> | |
public class EnumItemsSource : Collection<String>, IValueConverter | |
{ | |
Type _type; | |
IDictionary<Object, Object> _valueToNameMap; | |
IDictionary<Object, Object> _nameToValueMap; | |
public Type Type | |
{ | |
get { return _type; } | |
set | |
{ | |
if (!value.IsEnum) | |
// ReSharper disable LocalizableElement | |
throw new ArgumentException("Type is not an enum.", "value"); | |
// ReSharper restore LocalizableElement | |
_type = value; | |
Initialize(); | |
} | |
} | |
public Object Convert(Object value, Type targetType, Object parameter, CultureInfo culture) | |
{ | |
return _valueToNameMap != null ? _valueToNameMap[value] : null; | |
} | |
public Object ConvertBack(Object value, Type targetType, Object parameter, CultureInfo culture) | |
{ | |
if (value == null) return null; | |
return _nameToValueMap != null ? _nameToValueMap[value] : null; | |
} | |
void Initialize() | |
{ | |
_valueToNameMap = _type | |
.GetFields(BindingFlags.Static | BindingFlags.Public) | |
.ToDictionary(fi => fi.GetValue(null), GetDescription); | |
_nameToValueMap = _valueToNameMap | |
.ToDictionary(kvp => kvp.Value, kvp => kvp.Key); | |
Clear(); | |
foreach (var name in _nameToValueMap.Keys) | |
Add(name as string); | |
} | |
static Object GetDescription(FieldInfo fieldInfo) | |
{ | |
var descriptionAttribute = | |
(DescriptionAttribute)Attribute.GetCustomAttribute(fieldInfo, typeof(DescriptionAttribute)); | |
return descriptionAttribute != null ? descriptionAttribute.Description : fieldInfo.Name; | |
} | |
} |
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