如何将"#00E4FF"转换为代码刷？

Question

我需要将一些颜色(十六进制)转换为Brush.我需要在代码中执行此操作.

我该怎么做 ？

Answer 1

//this would be initialized somewhere else, I assume
string hex = "#00E4FF";

//strip out any # if they exist
hex = hex.Replace("#", string.Empty);

byte r = (byte)(Convert.ToUInt32(hex.Substring(0, 2), 16));
byte g = (byte)(Convert.ToUInt32(hex.Substring(2, 2), 16));
byte b = (byte)(Convert.ToUInt32(hex.Substring(4, 2), 16));

SolidColorBrush myBrush = new SolidColorBrush(Color.FromArgb(255, r, g, b));

Answer 2

增强版(包括所有颜色格式);

我需要其中一个也适用于3位"速记十六进制形式"和MS alpha通道版本(用于Silverlight/WPF),因此想出这个版本来涵盖所有数字颜色格式:

/// <summary>
/// Convert a Hex color string to a Color object
/// </summary>
/// <param name="htmlColor">Color string in #rgb, #argb, #rrggbb or #aarrggbb format</param>
/// <returns>A color object</returns>
public static Color ColorFromString(string htmlColor)
{
    htmlColor = htmlColor.Replace("#", "");
    byte a = 0xff, r = 0, g = 0, b = 0;
    switch (htmlColor.Length)
    {
        case 3:
            r = byte.Parse(htmlColor.Substring(0, 1), System.Globalization.NumberStyles.HexNumber);
            g = byte.Parse(htmlColor.Substring(1, 1), System.Globalization.NumberStyles.HexNumber);
            b = byte.Parse(htmlColor.Substring(2, 1), System.Globalization.NumberStyles.HexNumber);
            break;
        case 4:
            a = byte.Parse(htmlColor.Substring(0, 1), System.Globalization.NumberStyles.HexNumber);
            r = byte.Parse(htmlColor.Substring(1, 1), System.Globalization.NumberStyles.HexNumber);
            g = byte.Parse(htmlColor.Substring(2, 1), System.Globalization.NumberStyles.HexNumber);
            b = byte.Parse(htmlColor.Substring(3, 1), System.Globalization.NumberStyles.HexNumber);
            break;
        case 6:
            r = byte.Parse(htmlColor.Substring(0, 2), System.Globalization.NumberStyles.HexNumber);
            g = byte.Parse(htmlColor.Substring(2, 2), System.Globalization.NumberStyles.HexNumber);
            b = byte.Parse(htmlColor.Substring(4, 2), System.Globalization.NumberStyles.HexNumber);
            break;
        case 8:
            a = byte.Parse(htmlColor.Substring(0, 2), System.Globalization.NumberStyles.HexNumber);
            r = byte.Parse(htmlColor.Substring(2, 2), System.Globalization.NumberStyles.HexNumber);
            g = byte.Parse(htmlColor.Substring(4, 2), System.Globalization.NumberStyles.HexNumber);
            b = byte.Parse(htmlColor.Substring(6, 2), System.Globalization.NumberStyles.HexNumber);
            break;
    }
    return Color.FromArgb(a, r, g, b);
}

对于画笔,你可以像这样使用它:

return new SolidColorBrush(ColorFromString(colorString));

使用byte.Parse比Convert更有效,不需要强制转换.

更新:修复了案例8的子字符串偏移.