public override object ConvertFrom(object sourceValue, Type destinationType, IFormatProvider formatProvider, bool ignoreCase)
{
if (sourceValue == null)
{
return(null);
}
if (sourceValue.GetType() == typeof(int))
{
return(new OptionSetValue((int)sourceValue));
}
Int32Converter dc = new Int32Converter();
return(new OptionSetValue((int)dc.ConvertFrom(sourceValue)));
}
private bool TryGetInt(object value, out int intValue)
{
if (value is int)
{
intValue = (int)value;
return(true);
}
var converter = new Int32Converter();
var convertedValue = converter.ConvertFrom(value);
if (convertedValue != null)
{
intValue = (int)convertedValue;
return(true);
}
intValue = 0;
return(false);
}
internal static Color StaticConvertFromString(ITypeDescriptorContext context, string s, CultureInfo culture)
{
if (culture == null)
{
culture = CultureInfo.InvariantCulture;
}
s = s.Trim();
if (s.Length == 0)
{
return(Color.Empty);
}
// Try to process both NamedColor and SystemColors from the KnownColor enumeration
if (Char.IsLetter(s [0]))
{
KnownColor kc;
try {
kc = (KnownColor)Enum.Parse(typeof(KnownColor), s, true);
}
catch (Exception e) {
// whatever happens MS throws an basic Exception
string msg = Locale.GetText("Invalid color name '{0}'.", s);
throw new Exception(msg, new FormatException(msg, e));
}
return(KnownColors.FromKnownColor(kc));
}
String numSeparator = culture.TextInfo.ListSeparator;
Color result = Color.Empty;
if (s.IndexOf(numSeparator) == -1)
{
bool sharp = (s[0] == '#');
int start = sharp ? 1 : 0;
bool hex = false;
// deal with #hex, 0xhex and #0xhex
if ((s.Length > start + 1) && (s[start] == '0'))
{
hex = ((s[start + 1] == 'x') || (s[start + 1] == 'X'));
if (hex)
{
start += 2;
}
}
if (sharp || hex)
{
s = s.Substring(start);
int argb;
try {
argb = Int32.Parse(s, NumberStyles.HexNumber);
}
catch (Exception e) {
// whatever happens MS throws an basic Exception
string msg = Locale.GetText("Invalid Int32 value '{0}'.", s);
throw new Exception(msg, e);
}
// note that the default alpha value for a 6 hex digit (i.e. when none are present) is
// 0xFF while shorter string defaults to 0xFF - unless both # an 0x are specified
if ((s.Length < 6) || ((s.Length == 6) && sharp && hex))
{
argb &= 0x00FFFFFF;
}
else if ((argb >> 24) == 0)
{
argb |= unchecked ((int)0xFF000000);
}
result = Color.FromArgb(argb);
}
}
if (result.IsEmpty)
{
Int32Converter converter = new Int32Converter();
String [] components = s.Split(numSeparator.ToCharArray());
// MS seems to convert the indivual component to int before
// checking the number of components
int[] numComponents = new int[components.Length];
for (int i = 0; i < numComponents.Length; i++)
{
numComponents[i] = (int)converter.ConvertFrom(context,
culture, components[i]);
}
switch (components.Length)
{
case 1:
result = Color.FromArgb(numComponents[0]);
break;
case 3:
result = Color.FromArgb(numComponents[0], numComponents[1],
numComponents[2]);
break;
case 4:
result = Color.FromArgb(numComponents[0], numComponents[1],
numComponents[2], numComponents[3]);
break;
default:
throw new ArgumentException(s + " is not a valid color value.");
}
}
if (!result.IsEmpty)
{
// Look for a named or system color with those values
Color known = KnownColors.FindColorMatch(result);
if (!known.IsEmpty)
{
return(known);
}
}
return(result);
}
internal static Color StaticConvertFromString(ITypeDescriptorContext context, string s, CultureInfo culture)
{
if (culture == null)
{
culture = CultureInfo.InvariantCulture;
}
s = s.Trim();
if (s.Length == 0)
{
return(Color.Empty);
}
// Try to process both NamedColor and SystemColors from the KnownColor enumeration
if (Char.IsLetter(s[0]))
{
KnownColor kc;
try
{
kc = (KnownColor)Enum.Parse(typeof(KnownColor), s, true);
}
catch (Exception e)
{
// whatever happens MS throws an basic Exception
string msg = String.Format("Invalid color name '{0}'.", s);
throw new Exception(msg, new FormatException(msg, e));
}
return(KnownColors.FromKnownColor(kc));
}
String numSeparator = culture.TextInfo.ListSeparator;
Color result = Color.Empty;
try
{
result = new Color(s);
}
catch (Exception e)
{
// whatever happens MS throws an basic Exception
string msg = String.Format("Invalid Int32 value '{0}'.", s);
throw new Exception(msg, e);
}
if (result.IsEmpty)
{
Int32Converter converter = new Int32Converter();
String[] components = s.Split(numSeparator.ToCharArray());
// MS seems to convert the indivual component to int before
// checking the number of components
int[] numComponents = new int[components.Length];
for (int i = 0; i < numComponents.Length; i++)
{
numComponents[i] = (int)converter.ConvertFrom(context,
culture, components[i]);
}
switch (components.Length)
{
case 1:
result = new Color(Convert.ToUInt32(numComponents[0]));
break;
case 3:
result = new Color((byte)numComponents[0], (byte)numComponents[1],
(byte)numComponents[2]);
break;
case 4:
result = new Color((byte)numComponents[0], (byte)numComponents[1],
(byte)numComponents[2], (byte)numComponents[3]);
break;
default:
throw new ArgumentException(s + " is not a valid color value.");
}
}
if (!result.IsEmpty)
{
// Look for a named or system color with those values
Color known = KnownColors.FindColorMatch(result);
if (!known.IsEmpty)
{
return(known);
}
}
return(result);
}
