public static object Parse(Type enumType, string value, bool ignoreCase)
{
if (enumType == null)
{
throw new ArgumentNullException("enumType");
}
if (value == null)
{
throw new ArgumentNullException("value");
}
if (!enumType.IsEnum)
{
throw new ArgumentException("not an Enum type", "enumType");
}
EnumInfo info = enumType.EnumInfo;
if (info == null)
{
throw new ArgumentException("EnumInfo is null");
}
value = value.Trim();
if (value.Length == 0)
{
throw new ArgumentException("cannot be an empty string", "value");
}
// is 'value' a named constant?
int loc = FindName(info.names, value, ignoreCase);
if (loc >= 0)
{
return(info.values[loc]);
}
TypeCode typeCode = GetVTypeCode(enumType);
// is 'value' a list of named constants?
if (value.IndexOf(',') != -1)
{
string[] names = value.Split(split_char);
ulong num = 0;
int n = names.Length;
for (int i = 0; i < n; ++i)
{
loc = FindName(info.names, names[i].Trim(), ignoreCase);
if (loc < 0)
{
throw new ArgumentException("The requested value was not found.");
}
num |= GetValue(info.values[loc], typeCode);
}
return(ToObject(enumType, FixNumber(num, typeCode)));
}
// is 'value' a number?
try
{
return(ToObject(enumType, ParseValue(value, typeCode)));
}
catch (Exception e)
{
throw new ArgumentException(String.Format("The requested value `{0}' was not found", value), e);
}
}
static string FormatFlags(Type enumType, object value)
{
EnumInfo info = enumType.EnumInfo;
if (info == null)
{
throw new ArgumentException("enumInfo is null");
}
string asString = value.ToString();
if (asString == "0")
{
string name = GetName(enumType, value);
if (name == null)
{
return(asString);
}
return(name);
}
string retVal = "";
int n = info.values.Length;
TypeCode typeCode = Type.GetTypeCode(enumType.UnderlyingSystemType);
// This is ugly, yes. We need to handle the different integer
// types for enums. If someone else has a better idea, be my guest.
switch (typeCode)
{
case TypeCode.SByte:
{
sbyte flags = (sbyte)value;
for (int i = n - 1; i >= 0; i--)
{
sbyte enumValue = (sbyte)info.values[i];
if (enumValue == 0)
{
continue;
}
if ((flags & enumValue) == enumValue)
{
if (retVal.Length > 0)
{
retVal = info.names[i] + ", " + retVal;
}
else
{
retVal = info.names[i];
}
flags -= enumValue;
}
}
if (flags != 0)
{
return(asString);
}
}
break;
case TypeCode.Byte:
{
byte flags = (byte)value;
for (int i = n - 1; i >= 0; i--)
{
byte enumValue = (byte)info.values[i];
if (enumValue == 0)
{
continue;
}
if ((flags & enumValue) == enumValue)
{
if (retVal.Length > 0)
{
retVal = info.names[i] + ", " + retVal;
}
else
{
retVal = info.names[i];
}
flags -= enumValue;
}
}
if (flags != 0)
{
return(asString);
}
}
break;
case TypeCode.Int16:
{
short flags = (short)value;
for (int i = n - 1; i >= 0; i--)
{
short enumValue = (short)info.values[i];
if (enumValue == 0)
{
continue;
}
if ((flags & enumValue) == enumValue)
{
if (retVal.Length > 0)
{
retVal = info.names[i] + ", " + retVal;
}
else
{
retVal = info.names[i];
}
flags -= enumValue;
}
}
if (flags != 0)
{
return(asString);
}
}
break;
case TypeCode.Int32:
{
int flags = (int)value;
for (int i = n - 1; i >= 0; i--)
{
int enumValue = (int)info.values[i];
if (enumValue == 0)
{
continue;
}
if ((flags & enumValue) == enumValue)
{
if (retVal.Length > 0)
{
retVal = info.names[i] + ", " + retVal;
}
else
{
retVal = info.names[i];
}
flags -= enumValue;
}
}
if (flags != 0)
{
return(asString);
}
}
break;
case TypeCode.UInt16:
{
ushort flags = (ushort)value;
for (int i = n - 1; i >= 0; i--)
{
ushort enumValue = (ushort)info.values[i];
if (enumValue == 0)
{
continue;
}
if ((flags & enumValue) == enumValue)
{
if (retVal.Length > 0)
{
retVal = info.names[i] + ", " + retVal;
}
else
{
retVal = info.names[i];
}
flags -= enumValue;
}
}
if (flags != 0)
{
return(asString);
}
}
break;
case TypeCode.UInt32:
{
uint flags = (uint)value;
for (int i = n - 1; i >= 0; i--)
{
uint enumValue = (uint)info.values[i];
if (enumValue == 0)
{
continue;
}
if ((flags & enumValue) == enumValue)
{
if (retVal.Length > 0)
{
retVal = info.names[i] + ", " + retVal;
}
else
{
retVal = info.names[i];
}
flags -= enumValue;
}
}
if (flags != 0)
{
return(asString);
}
}
break;
case TypeCode.Int64:
{
long flags = (long)value;
for (int i = n - 1; i >= 0; i--)
{
long enumValue = (long)info.values[i];
if (enumValue == 0)
{
continue;
}
if ((flags & enumValue) == enumValue)
{
if (retVal.Length > 0)
{
retVal = info.names[i] + ", " + retVal;
}
else
{
retVal = info.names[i];
}
flags -= enumValue;
}
}
if (flags != 0)
{
return(asString);
}
}
break;
case TypeCode.UInt64:
{
ulong flags = (ulong)value;
for (int i = n - 1; i >= 0; i--)
{
ulong enumValue = (ulong)info.values[i];
if (enumValue == 0)
{
continue;
}
if ((flags & enumValue) == enumValue)
{
if (retVal.Length > 0)
{
retVal = info.names[i] + ", " + retVal;
}
else
{
retVal = info.names[i];
}
flags -= enumValue;
}
}
if (flags != 0)
{
return(asString);
}
}
break;
}
if (retVal == "")
{
return(asString);
}
return(retVal);
}
internal static string Format(Type enumType, object value, string format)
{
if (enumType == null)
{
throw new ArgumentNullException("enumType");
}
if (value == null)
{
throw new ArgumentNullException("value");
}
if (format == null)
{
throw new ArgumentNullException("format");
}
if (!enumType.IsEnum)
{
throw new ArgumentException("Type provided must be an Enum.");
}
Type vType = value.GetType();
Type underlyingType = GetUnderlyingType(enumType);
if (vType.IsEnum)
{
if (vType != enumType)
{
throw new ArgumentException(string.Format("Object must be the same type as the enum. The type" +
" passed in was {0}; the enum type was {1}.",
vType.FullName, enumType.FullName));
}
}
else if (vType != underlyingType)
{
throw new ArgumentException(string.Format("Enum underlying type and the object must be the same type" +
" or object. Type passed in was {0}; the enum underlying" +
" type was {1}.", vType.FullName, underlyingType.FullName));
}
if (format.Length != 1)
{
throw new FormatException("Format String can be only \"G\",\"g\",\"X\"," +
"\"x\",\"F\",\"f\",\"D\" or \"d\".");
}
Enum e = value as Enum;
if (e != null)
{
value = e.GetValue();
}
char formatChar = format[0];
string retVal;
if ((formatChar == 'G' || formatChar == 'g'))
{
EnumInfo info = enumType.EnumInfo;
if (info == null)
{
throw new ArgumentException("enumInfo is null");
}
if (!info.flags)
{
retVal = GetName(enumType, value);
if (retVal == null)
{
retVal = value.ToString();
}
return(retVal);
}
formatChar = 'f';
}
if ((formatChar == 'f' || formatChar == 'F'))
{
return(FormatFlags(enumType, value));
}
switch (formatChar)
{
case 'X':
retVal = FormatHex(enumType, value, true);
break;
case 'x':
retVal = FormatHex(enumType, value, false);
break;
case 'D':
case 'd':
if (underlyingType == typeof(ulong))
{
ulong ulongValue = Convert.ToUInt64(value);
retVal = ulongValue.ToString();
}
else
{
long longValue = Convert.ToInt64(value);
retVal = longValue.ToString();
}
break;
default:
throw new FormatException("Format String can be only \"G\",\"g\",\"X\"," +
"\"x\",\"F\",\"f\",\"D\" or \"d\".");
}
return(retVal);
}
