public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (value is string strValue)
{
string text = strValue.Trim();
if (text.Length == 0)
{
return(null);
}
// Parse 2 integer values.
if (culture == null)
{
culture = CultureInfo.CurrentCulture;
}
char sep = culture.TextInfo.ListSeparator[0];
string[] tokens = text.Split(sep);
int[] values = new int[tokens.Length];
TypeConverter intConverter = TypeDescriptor.GetConverterTrimUnsafe(typeof(int));
for (int i = 0; i < values.Length; i++)
{
// Note: ConvertFromString will raise exception if value cannot be converted.
values[i] = (int)intConverter.ConvertFromString(context, culture, tokens[i]);
}
if (values.Length == 2)
{
return(new Point(values[0], values[1]));
}
else
{
throw new ArgumentException(SR.Format(SR.TextParseFailedFormat, text, "x, y"));
}
}
return(base.ConvertFrom(context, culture, value));
}
public override object?ConvertTo(ITypeDescriptorContext?context, CultureInfo?culture, object?value, Type destinationType)
{
if (destinationType == null)
{
throw new ArgumentNullException(nameof(destinationType));
}
if (value is SizeF size)
{
if (destinationType == typeof(string))
{
if (culture == null)
{
culture = CultureInfo.CurrentCulture;
}
string sep = culture.TextInfo.ListSeparator + " ";
TypeConverter floatConverter = TypeDescriptor.GetConverterTrimUnsafe(typeof(float));
var args = new string?[]
{
floatConverter.ConvertToString(context, culture, size.Width),
floatConverter.ConvertToString(context, culture, size.Height)
};
return(string.Join(sep, args));
}
else if (destinationType == typeof(InstanceDescriptor))
{
ConstructorInfo?ctor = typeof(SizeF).GetConstructor(new Type[] { typeof(float), typeof(float) });
if (ctor != null)
{
return(new InstanceDescriptor(ctor, new object[] { size.Width, size.Height }));
}
}
}
return(base.ConvertTo(context, culture, value, destinationType));
}
public override object?ConvertTo(ITypeDescriptorContext?context, CultureInfo?culture, object?value, Type destinationType)
{
ArgumentNullException.ThrowIfNull(destinationType);
if (value is Size size)
{
if (destinationType == typeof(string))
{
if (culture == null)
{
culture = CultureInfo.CurrentCulture;
}
string sep = culture.TextInfo.ListSeparator + " ";
TypeConverter intConverter = TypeDescriptor.GetConverterTrimUnsafe(typeof(int));
// Note: ConvertToString will raise exception if value cannot be converted.
var args = new string?[]
{
intConverter.ConvertToString(context, culture, size.Width),
intConverter.ConvertToString(context, culture, size.Height)
};
return(string.Join(sep, args));
}
else if (destinationType == typeof(InstanceDescriptor))
{
ConstructorInfo?ctor = typeof(Size).GetConstructor(new Type[] { typeof(int), typeof(int) });
if (ctor != null)
{
return(new InstanceDescriptor(ctor, new object[] { size.Width, size.Height }));
}
}
}
return(base.ConvertTo(context, culture, value, destinationType));
}
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType == null)
{
throw new ArgumentNullException(nameof(destinationType));
}
if (value is Color c)
{
if (destinationType == typeof(string))
{
if (c == Color.Empty)
{
return(string.Empty);
}
// If this is a known color, then Color can provide its own name.
// Otherwise, we fabricate an ARGB value for it.
if (ColorTable.IsKnownNamedColor(c.Name))
{
return(c.Name);
}
else if (c.IsNamedColor)
{
return("'" + c.Name + "'");
}
if (culture == null)
{
culture = CultureInfo.CurrentCulture;
}
string sep = culture.TextInfo.ListSeparator + " ";
TypeConverter intConverter = TypeDescriptor.GetConverterTrimUnsafe(typeof(int));
string[] args;
int nArg = 0;
if (c.A < 255)
{
args = new string[4];
args[nArg++] = intConverter.ConvertToString(context, culture, (object)c.A);
}
else
{
args = new string[3];
}
// Note: ConvertToString will raise exception if value cannot be converted.
args[nArg++] = intConverter.ConvertToString(context, culture, (object)c.R);
args[nArg++] = intConverter.ConvertToString(context, culture, (object)c.G);
args[nArg++] = intConverter.ConvertToString(context, culture, (object)c.B);
return(string.Join(sep, args));
}
else if (destinationType == typeof(InstanceDescriptor))
{
MemberInfo member = null;
object[] args = null;
if (c.IsEmpty)
{
member = typeof(Color).GetField("Empty");
}
else if (ColorTable.IsKnownNamedColor(c.Name))
{
member = typeof(Color).GetProperty(c.Name) ?? typeof(SystemColors).GetProperty(c.Name);
}
else if (c.A != 255)
{
member = typeof(Color).GetMethod("FromArgb", new Type[] { typeof(int), typeof(int), typeof(int), typeof(int) });
args = new object[] { c.A, c.R, c.G, c.B };
}
else if (c.IsNamedColor)
{
member = typeof(Color).GetMethod("FromName", new Type[] { typeof(string) });
args = new object[] { c.Name };
}
else
{
member = typeof(Color).GetMethod("FromArgb", new Type[] { typeof(int), typeof(int), typeof(int) });
args = new object[] { c.R, c.G, c.B };
}
Debug.Assert(member != null, "Could not convert color to member. Did someone change method name / signature and not update ColorConverter?");
if (member != null)
{
return(new InstanceDescriptor(member, args));
}
else
{
return(null);
}
}
}
return(base.ConvertTo(context, culture, value, destinationType));
}