Returns a color based on XAML color string. - CSharp System.Drawing

CSharp examples for System.Drawing:Color Convert

  1. HOME
  2. CSharp
  3. System.Drawing
  4. Color Convert

Description

Returns a color based on XAML color string.

Demo Code

// Copyright (c) Microsoft. All rights reserved.
using Windows.UI;
using System.Reflection;
using System;/*from w w  w. j a  v a 2s.c o m*/

public class Main{
        /// <summary>
        /// Returns a color based on XAML color string.
        /// </summary>
        /// <param name="colorString">The color string. Any format used in XAML should work.</param>
        /// <returns>Parsed color</returns>
        public static Color ToColor(this string colorString)
        {
            if (string.IsNullOrEmpty(colorString))
            {
                throw new ArgumentException(nameof(colorString));
            }

            if (colorString[0] == '#')
            {
                switch (colorString.Length)
                {
                    case 9:
                        {
                            var cuint = Convert.ToUInt32(colorString.Substring(1), 16);
                            var a = (byte)(cuint >> 24);
                            var r = (byte)((cuint >> 16) & 0xff);
                            var g = (byte)((cuint >> 8) & 0xff);
                            var b = (byte)(cuint & 0xff);

                            return Color.FromArgb(a, r, g, b);
                        }

                    case 7:
                        {
                            var cuint = Convert.ToUInt32(colorString.Substring(1), 16);
                            var r = (byte)((cuint >> 16) & 0xff);
                            var g = (byte)((cuint >> 8) & 0xff);
                            var b = (byte)(cuint & 0xff);

                            return Color.FromArgb(255, r, g, b);
                        }

                    case 5:
                        {
                            var cuint = Convert.ToUInt16(colorString.Substring(1), 16);
                            var a = (byte)(cuint >> 12);
                            var r = (byte)((cuint >> 8) & 0xf);
                            var g = (byte)((cuint >> 4) & 0xf);
                            var b = (byte)(cuint & 0xf);
                            a = (byte)(a << 4 | a);
                            r = (byte)(r << 4 | r);
                            g = (byte)(g << 4 | g);
                            b = (byte)(b << 4 | b);

                            return Color.FromArgb(a, r, g, b);
                        }

                    case 4:
                        {
                            var cuint = Convert.ToUInt16(colorString.Substring(1), 16);
                            var r = (byte)((cuint >> 8) & 0xf);
                            var g = (byte)((cuint >> 4) & 0xf);
                            var b = (byte)(cuint & 0xf);
                            r = (byte)(r << 4 | r);
                            g = (byte)(g << 4 | g);
                            b = (byte)(b << 4 | b);

                            return Color.FromArgb(255, r, g, b);
                        }

                    default:
                        throw new FormatException(string.Format("The {0} string passed in the colorString argument is not a recognized Color format.", colorString));
                }
            }

            if (colorString.Length > 3 && colorString[0] == 's' && colorString[1] == 'c' && colorString[2] == '#')
            {
                var values = colorString.Split(',');

                if (values.Length == 4)
                {
                    var scA = double.Parse(values[0].Substring(3));
                    var scR = double.Parse(values[1]);
                    var scG = double.Parse(values[2]);
                    var scB = double.Parse(values[3]);

                    return Color.FromArgb((byte)(scA * 255), (byte)(scR * 255), (byte)(scG * 255), (byte)(scB * 255));
                }

                if (values.Length == 3)
                {
                    var scR = double.Parse(values[0].Substring(3));
                    var scG = double.Parse(values[1]);
                    var scB = double.Parse(values[2]);

                    return Color.FromArgb(255, (byte)(scR * 255), (byte)(scG * 255), (byte)(scB * 255));
                }

                throw new FormatException(string.Format("The {0} string passed in the colorString argument is not a recognized Color format (sc#[scA,]scR,scG,scB).", colorString));
            }

            var prop = typeof(Colors).GetTypeInfo().GetDeclaredProperty(colorString);

            if (prop != null)
            {
                return (Color)prop.GetValue(null);
            }

            throw new FormatException(string.Format("The {0} string passed in the colorString argument is not a recognized Color.", colorString));
        }
}

Related Tutorials