EnumParser实现

先看例子：

public enum Color
{
  Red,
  Blue,
  Gray,
}

Color redColorEnum = EnumParser<color>.Parse("Red");
</color>

以下是实现代码：

public static class EnumParser<t>
{
  private static readonly Dictionary<string , T> _dictionary = new Dictionary</string><string , T>();

  static EnumParser()
  {
    if (!typeof(T).IsEnum)
      throw new NotSupportedException("Type " + typeof(T).FullName + " is not an enum.");

    string[] names = Enum.GetNames(typeof(T));
    T[] values = (T[]) Enum.GetValues(typeof(T));

    int count = names.Length;
    for(int i=0; i<count ; i++)
      _dictionary.Add(names[i], values[i]);
  }

  public static bool TryParse(string name, out T value)
  {
    return _dictionary.TryGetValue(name, out value);
  }

  public static T Parse(string name)
  {
    return _dictionary[name];
  }
}