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Last night I was working on a new web site that I hope to release within 2 to 4 weeks. Right now I’m working on the graphics, and I wanted to use silver. Unfortunately, the graphics editor I’m using doesn’t have a list of colors via well-known names, so I had to enter the RGB value manually. Now, .NET defines the Silver property on the Color class, but the SDK doesn’t tell you what the RGB values are. Well, I could’ve written a small snippet to show the RGB values for that specific color, but I decided to generalize it a bit and use Reflection to list all of the color properties on the Color structure:
using System;
using System.Drawing;
using System.Reflection;
class ColorList
{
[STAThread]static void Main(string[] args)
{
Type colorType = typeof(Color);
foreach(PropertyInfo colorProperty in colorType.GetProperties())
{
if(colorProperty.PropertyType == colorType)
{
Color colorPropertyValue = (Color)colorProperty.GetValue(null, null);
Console.WriteLine(
"{0}, R={1}, G={2}, B={3}",
colorPropertyValue,colorPropertyValue.R,
colorPropertyValue.G,colorPropertyValue.B);
}
}
}
}
When you run this, the console window will spit back a bunch of colors and their corresponding RGB values [1]. I’m sure there’s an easier way to do this [2], but to me this is a good example of how you can use Reflection to query metadata and find the values you’re looking for in a relatively straightforward fashion.
[1] For the interested reader, silver is Color [Silver], R=192, G=192, B=192.
[2] If you know of one, I’m all ears!
Published: 07.27.2004 09:44:07 AM CST