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我有代码十六进制代码“FFB800”，我需要在 WinRT 中转换为“颜色”。

提前致谢。

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4 回答 4

5

提问的目的是什么？是否可以在纯 XAML 中执行此操作？XAML 确实采用十六进制代码。

    <Grid Background="#FFB800">

否则，在代码隐藏中，我在 Windows 8 应用程序中或多或少地使用了以下内容：

    var hexCode = "#FFFFB800";
    var color = new Color();
    color.A = byte.Parse(hexCode.Substring(1, 2), NumberStyles.AllowHexSpecifier);
    color.R = byte.Parse(hexCode.Substring(3, 2), NumberStyles.AllowHexSpecifier);
    color.G = byte.Parse(hexCode.Substring(5, 2), NumberStyles.AllowHexSpecifier);
    color.B = byte.Parse(hexCode.Substring(7, 2), NumberStyles.AllowHexSpecifier);
于 2013-05-29T13:31:21.820 回答
3

在推文中执行此操作的简短方法：

(Color)XamlReader.Load(string.Format("<Color xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation …\">{0}</Color>", c));

推荐的方法是从 NuGet获取WinRT XAML Toolkit并调用

WinRTXamlToolkit.Imaging.ColorExtensions.FromString(c);

这比 using 运行得更快XamlReader，因此如果您需要多次调用它，建议您使用它。您也可以从GitHub克隆它或从此处复制和粘贴：

#region FromString()
/// <summary>
/// Returns a Color based on XAML color string.
/// </summary>
/// <param name="c">The color string. Any format used in XAML should work.</param>
/// <returns></returns>
public static Color FromString(string c)
{
    if (string.IsNullOrEmpty(c))
        throw new ArgumentException("Invalid color string.", "c");

    if (c[0] == '#')
    {
        switch (c.Length)
        {
            case 9:
            {
                //var cuint = uint.Parse(c.Substring(1), NumberStyles.HexNumber);
                var cuint = Convert.ToUInt32(c.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(c.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(c.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(c.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 c argument is not a recognized Color format.", c));
        }
    }
    else if (
        c.Length > 3 &&
        c[0] == 's' &&
        c[1] == 'c' &&
        c[2] == '#')
    {
        var values = c.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));
        }
        else 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));
        }
        else
        {
            throw new FormatException(string.Format("The {0} string passed in the c argument is not a recognized Color format (sc#[scA,]scR,scG,scB).", c));
        }
    }
    else
    {
        var prop = typeof(Colors).GetTypeInfo().GetDeclaredProperty(c);
        return (Color)prop.GetValue(null);
    }
}
#endregion
于 2013-05-24T21:08:45.830 回答
1 
        var hexCode = "#FFFFB800";
        var color = new Color();
        color.A = byte.Parse(hexCode.Substring(7, 2), NumberStyles.AllowHexSpecifier);
        color.R = byte.Parse(hexCode.Substring(1, 2), NumberStyles.AllowHexSpecifier);
        color.G = byte.Parse(hexCode.Substring(3, 2), NumberStyles.AllowHexSpecifier);
        color.B = byte.Parse(hexCode.Substring(5, 2), NumberStyles.AllowHexSpecifier);

如何设置为 xaml 矩形对象的填充

rect.Fill = new SolidColorBrush(color);

像这样的另一种解决方案有效，但是如果您只有 6 位十六进制而不是完整的 8 位，则将参数乱序返回，只需将 a 设置为 255

于 2014-07-17T18:42:40.903 回答
0

试试这个：

public struct MyColor : Windows.UI.Color
{
    /// <summary>
    /// Convert hexdecimal value into color.
    /// </summary>
    /// <param name="hexCode">hexdecimal of color.</param>
    /// <returns></returns>
    public Windows.UI.Xaml.Media.Brush ColorToBrush(string hexCode)
    {
        hexCode = hexCode.Replace("#", "");

        if (hexCode.Length == 6)
            return new Windows.UI.Xaml.Media.SolidColorBrush(Windows.UI.ColorHelper.FromArgb(255,
                byte.Parse(hexCode.Substring(0, 2), System.Globalization.NumberStyles.HexNumber),
                byte.Parse(hexCode.Substring(2, 2), System.Globalization.NumberStyles.HexNumber),
                byte.Parse(hexCode.Substring(4, 2), System.Globalization.NumberStyles.HexNumber)));
        else if (hexCode.Length == 8)
        {
            var color = new Windows.UI.Color();
            color.A = byte.Parse(hexCode.Substring(0, 2), System.Globalization.NumberStyles.AllowHexSpecifier);
            color.R = byte.Parse(hexCode.Substring(2, 2), System.Globalization.NumberStyles.AllowHexSpecifier);
            color.G = byte.Parse(hexCode.Substring(4, 2), System.Globalization.NumberStyles.AllowHexSpecifier);
            color.B = byte.Parse(hexCode.Substring(6, 2), System.Globalization.NumberStyles.AllowHexSpecifier);
        }

        return null;
    }
}
于 2015-02-05T10:53:24.003 回答