//http://facebooktoolkit.codeplex.com/
//http://facebooktoolkit.codeplex.com/license
using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Text;
namespace Facebook.Utility
{
///<summary>
/// Contains helper functions used to help when using enums inside of collections and serialization
///</summary>
public class EnumHelper
{
private EnumHelper()
{
}
///<summary>
///</summary>
///<param name="enumeratedType"></param>
///<typeparam name="T"></typeparam>
///<returns></returns>
///<exception cref="ArgumentException"></exception>
public static string GetEnumDescription<T>(T enumeratedType)
{
var description = enumeratedType.ToString();
var enumType = typeof (T);
// Can't use type constraints on value types, so have to do check like this
if (enumType.BaseType != typeof (Enum))
throw new ArgumentException("T must be of type System.Enum");
var fieldInfo = enumeratedType.GetType().GetField(enumeratedType.ToString());
if (fieldInfo != null)
{
var attributes = fieldInfo.GetCustomAttributes(typeof (DescriptionAttribute), false);
if (attributes != null && attributes.Length > 0)
{
description = ((DescriptionAttribute) attributes[0]).Description;
}
}
return description;
}
///<summary>
///</summary>
///<param name="enums"></param>
///<typeparam name="T"></typeparam>
///<returns></returns>
///<exception cref="ArgumentException"></exception>
public static string GetEnumCollectionDescription<T>(Collection<T> enums)
{
var sb = new StringBuilder();
var enumType = typeof (T);
// Can't use type constraints on value types, so have to do check like this
if (enumType.BaseType != typeof (Enum))
throw new ArgumentException("T must be of type System.Enum");
foreach (var enumeratedType in enums)
{
sb.AppendLine(GetEnumDescription(enumeratedType));
}
return sb.ToString();
}
}
}
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