/// <summary>
/// 获取集合中具有指定键的项的T类型值(注：T类型应与defaultValue类型相同)
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="collection"></param>
/// <param name="key"></param>
/// <param name="defaultValue"></param>
/// <returns></returns>
public static T GetEnum <T>(this NameValueCollection collection, string key, Enum defaultValue) where T : struct
{
Type tType = typeof(T);
//判断类型条件是否成立
if (tType != defaultValue.GetType())
{
throw new Exception("T must be the same type with param defaultValue.");
}
int emValue = GetInt(collection, key, defaultValue.GetValue());
if (defaultValue.ContainsKey(emValue))
{
return((T)Enum.Parse(tType, emValue.ToString()));
}
else
{
return((T)Convert.ChangeType(defaultValue, tType));
}
}
