Set Value of CSS Property when CSS is string in C#

Question

I have a string in C# that's essentially a CSS file. I can parse this CSS file and extract values with this library that has been extremely helpful: https://github.com/TylerBrinks/ExCSS

That's all fantastic. However, I now need to change the values within the file and I cannot figure out for the life of me how to reliably do this.

In the simplest terms possible, I have this string in C#:

body
{
   background-color:#323432;
}

I need to write a function:

public string ChangeValue(string oldstring, string name, string type, string value)

That when called with this:

string newstring = ChangeValue("body{background-color:#323432;}", "body","background-color","#ffffff");

The "newstring" string above, turns into this:

body
{
   background-color:#ffffff;
}

Really really appreciate the help. Thank you.

Do you mean public string ChangeValue or are you stuck with a void return type? — jdphenix
– jdphenix, Commented Apr 30, 2015 at 6:38
You need algorithm how to parse css string? Do array from this using '}', than '{', than subarray using ';'. Or I does not understand your question? — degr
– degr, Commented Apr 30, 2015 at 6:41

jdphenix · Accepted Answer · 2015-04-30 07:08:47Z

4

You can accomplish this without passing in the old string. You'll need to return a string, not void.

public static string ChangeValue(string name, string type, string value) {
     return String.Format("{0}\r\n{{\r\n    {1}:{2};\r\n}}", name, type, value);
}

output:

body
{
    background-color:#ffffff;
}

But why not use the API the ExCSS exposes?

var parser = new Parser();
var stylesheet = parser.Parse(css);

var bodyBackgroundColor = stylesheet.StyleRules
  .FirstOrDefault(s => s.Selector.ToString() == "body")
  .Declarations
  .FirstOrDefault(d => d.Name == "background-color")
  .Term = new HtmlColor(255, 255, 255);

Console.WriteLine(stylesheet.ToString(true, 0));

Output:

body{
        background-color:#FFF;
}

edited Apr 30, 2015 at 7:08

answered Apr 30, 2015 at 6:53

jdphenix

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2 Comments

FAtBalloon Over a year ago

Just for my own knowledge, how did you figure out that the API exposes that ability?

jdphenix Over a year ago

I guessed when I saw this exposed in the public API github.com/TylerBrinks/ExCSS/blob/master/ExCSS/IToString.cs

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