/// <summary>
/// Initializes the <see cref="EnumInfo{TEnum}"/> for the enum type <typeparamref name="TEnum"/>.
/// </summary>
static EnumInfo()
{
Type = typeof(TEnum);
UnderlyingType = Enum.GetUnderlyingType(Type);
IsUInt64 = UnderlyingType == typeof(ulong);
if (!typeof(TEnum).IsEnum)
{
throw new ArgumentException($"{Type.Name} is not an enum!",
nameof(TEnum));
}
DefaultValue = default;
nameLookup = new Dictionary <string, EnumFieldInfo <TEnum> >();
nameLookupIgnoreCase = new Dictionary <string, EnumFieldInfo <TEnum> >(StringComparer.InvariantCultureIgnoreCase);
valueLookup = new Dictionary <TEnum, EnumFieldInfo <TEnum> >();
foreach (FieldInfo field in Type.GetFields(BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic))
{
var info = new EnumFieldInfo <TEnum>(field, IsUInt64);
nameLookup.Add(info.Name, info);
// Just incase this enum can't handle ignore-case.
if (!nameLookupIgnoreCase.ContainsKey(info.Name))
{
nameLookupIgnoreCase.Add(info.Name, info);
}
// Ignore duplicate enum values
if (!valueLookup.ContainsKey(info.Value))
{
valueLookup.Add(info.Value, info);
}
}
Fields = Array.AsReadOnly(nameLookup.Values.ToArray());
HasDefaultField = valueLookup.ContainsKey(DefaultValue);
}
/// <summary>
/// Tries to get the field for the specified enum value name.
/// </summary>
/// <param name="name">The name of the enum value.</param>
/// <param name="field">The output field if one is found, otherwise null.</param>
/// <returns>True if a field was found with the specified name.</returns>
///
/// <exception cref="ArgumentNullException">
/// <paramref name="name"/> is null.
/// </exception>
public static bool TryGetField(string name, out EnumFieldInfo <TEnum> field)
{
return(nameLookup.TryGetValue(name, out field));
}
/// <summary>
/// Tries to get the field for the specified enum value name.
/// </summary>
/// <param name="name">The name of the enum value.</param>
/// <param name="ignoreCase">True if the name casing can be ignored.</param>
/// <param name="field">The output field if one is found, otherwise null.</param>
/// <returns>True if a field was found with the specified name.</returns>
///
/// <exception cref="ArgumentNullException">
/// <paramref name="name"/> is null.
/// </exception>
public static bool TryGetField(string name, bool ignoreCase, out EnumFieldInfo <TEnum> field)
{
return(GetNameLookup(ignoreCase).TryGetValue(name, out field));
}
/// <summary>
/// Tries to get the field for the specified enum value.
/// </summary>
/// <param name="value">The value of the enum.</param>
/// <param name="field">The output field if one is found, otherwise null.</param>
/// <returns>True if a field was found with the specified value.</returns>
public static bool TryGetField(TEnum value, out EnumFieldInfo <TEnum> field)
{
return(valueLookup.TryGetValue(value, out field));
}