Svg.SvgUnitConverter.ConvertFrom C# (CSharp) Method

        public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
        {
            if (value == null)
            {
                return new SvgUnit(SvgUnitType.User, 0.0f);
            }

            if (!(value is string))
            {
                throw new ArgumentOutOfRangeException("value must be a string.");
            }

			//support exponents (the SVG that comes back from IE may be an exponent ugh!!!)
			if ((value as string).Contains("e"))
			{
				var d = Decimal.Parse((string)value, System.Globalization.NumberStyles.Float);
				value = d.ToString();
			}

            // http://www.w3.org/TR/CSS21/syndata.html#values
            // http://www.w3.org/TR/SVG11/coords.html#Units

            string unit = (string)value;
            int identifierIndex = -1;

            if (unit == "none")
                return SvgUnit.None;

            for (int i = 0; i < unit.Length; i++)
            {
                if (char.IsLetter(unit[i]) || unit[i] == '%')
                {
                    identifierIndex = i;
                    break;
                }
            }

            float val = 0.0f;
            float.TryParse((identifierIndex > -1) ? unit.Substring(0, identifierIndex) : unit, NumberStyles.Float, CultureInfo.InvariantCulture, out val);

            if (identifierIndex == -1)
            {
                return new SvgUnit(val);
            }

            switch (unit.Substring(identifierIndex).Trim().ToLower())
            {
                case "mm":
                    return new SvgUnit(SvgUnitType.Millimeter, val);
                case "cm":
                    return new SvgUnit(SvgUnitType.Centimeter, val);
                case "in":
                    return new SvgUnit(SvgUnitType.Inch, val);
                case "px":
                    return new SvgUnit(SvgUnitType.Pixel, val);
                case "pt":
                    return new SvgUnit(SvgUnitType.Point, val);
                case "pc":
                    return new SvgUnit(SvgUnitType.Pica, val);
                case "%":
                    return new SvgUnit(SvgUnitType.Percentage, val);
                case "em":
                    return new SvgUnit(SvgUnitType.Em, val);
                default:
                    throw new FormatException("Unit is in an invalid format '" + unit + "'.");
            }
        }

        /// <summary>
        /// Converts the given object to the type of this converter, using the specified context and culture information.
        /// </summary>
        /// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext"/> that provides a format context.</param>
        /// <param name="culture">The <see cref="T:System.Globalization.CultureInfo"/> to use as the current culture.</param>
        /// <param name="value">The <see cref="T:System.Object"/> to convert.</param>
        /// <returns>
        /// An <see cref="T:System.Object"/> that represents the converted value.
        /// </returns>
        /// <exception cref="T:System.NotSupportedException">The conversion cannot be performed. </exception>
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
        {
            if (value is string)
            {
                var s = ((string)value).Trim();

                if (s.Equals("inherit", StringComparison.OrdinalIgnoreCase))
                {
                    return(null);
                }

                var units = new SvgUnitCollection();
                if (!s.Equals("none", StringComparison.OrdinalIgnoreCase))
                {
                    foreach (var point in s.Split(new char[] { ',', ' ', '\r', '\n', '\t' }, StringSplitOptions.RemoveEmptyEntries))
                    {
                        var newUnit = (SvgUnit)_unitConverter.ConvertFrom(point.Trim());
                        if (!newUnit.IsNone)
                        {
                            units.Add(newUnit);
                        }
                    }
                }

                return(units);
            }

            return(base.ConvertFrom(context, culture, value));
        }