如何将RGB int值转换为字符串颜色

Question

谁能告诉我如何在C＃中将三个int值r, g, b转换为字符串颜色（六值）

Answer 1

尝试这个

 string s = Color.FromArgb(255, 143, 143, 143).Name;

Answer 2

int red = 255;
int green = 255;
int blue = 255;

string theHexColor = "#" + red.ToString("X2") + green.ToString("X2") + blue.ToString("X2");

Answer 3

RGB到十六进制：

string hexColor = string.Format("0x{0:X8}", Color.FromArgb(r, g, b).ToArgb());

十六进制为Rgb：

int rgbColor = int.Parse("FF", System.Globalization.NumberStyles.AllowHexSpecifier);

Answer 4

请找到以下扩展方法：

public static class ColorExtensions
{
    public static string ToRgb(this int argb)
    {
        var r = ((argb >> 16) & 0xff);
        var g = ((argb >> 8) & 0xff);
        var b = (argb & 0xff);

        return string.Format("{0:X2}{1:X2}{2:X2}", r, g, b);
    }
}

这是您的用法：

        int colorBlack = 0x000000;
        int colorWhite = 0xffffff;

        Assert.That(colorBlack.ToRgb(), Is.EqualTo("000000"));
        Assert.That(colorWhite.ToRgb(), Is.EqualTo("FFFFFF"));

Answer 5

为PowerPoint形状对象的Fill.ForeColor.RGB成员解决了此问题，我发现RGB值实际上是BGR（蓝色，绿色，红色），因此C＃PowerPoint插件将Fill.ForeColor.RGB转换为字符串的解决方案是：

string strColor = "";
var b = ((shpTemp.Fill.ForeColor.RGB >> 16) & 0xff);
var g = ((shpTemp.Fill.ForeColor.RGB >> 8) & 0xff);
var r = (shpTemp.Fill.ForeColor.RGB & 0xff);

strColor = string.Format("{0:X2}{1:X2}{2:X2}", r, g, b);

Answer 6

我所做的如下：

    int reducedRed = getRed(long color)/128; // this gives you a number 1 or 0. 
    int reducedGreen = getGreen(long color)/128; // same thing for the green value; 
    int reducedBlue = getBlue(long color)/128; //same thing for blue
    int reducedColor = reducedBlue + reducedGreen*2 + reducedRed*4 ;
    // reduced Color is a number between 0 -7 

一旦获得了reduceColor，就可以在0到7之间进行切换。

    switch(reducedColor){
       case 0: return "000000";      // corresponds to Black
       case 1: return “0000FF";         // corresponds to Blue
       case 2: return "00FF00";       // corresponds to Green
       case 3: return "00FFFF";        // corresponds to Cyan 
       case 4: return “FF0000";          // corresponds to Red
       case 5: return "FF00FF";       //corresponds to Purple
       case 6: return "FFFF00";     //corresponds to Yellow
       case 7: return  “FFFFFF";       //corresponds to White
    }

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