StringBuilderExtensions.cs

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using System.Text;
 
namespace System.Net.Http;
 
internal static class StringBuilderExtensions
{
    private static readonly char[] SpecialCharacters = new char[2] { '"', '\\' };
 
    public static void AppendKeyValue(this StringBuilder sb, string key, string value, bool includeQuotes = true, bool includeComma = true)
    {
        sb.Append(key);
        sb.Append('=');
        if (includeQuotes)
        {
            sb.Append('"');
            int num = 0;
            while (true)
            {
                int num2 = value.IndexOfAny(SpecialCharacters, num);
                if (num2 < 0)
                {
                    break;
                }
                sb.Append(value, num, num2 - num);
                sb.Append('\\');
                sb.Append(value[num2]);
                num = num2 + 1;
            }
            sb.Append(value, num, value.Length - num);
            sb.Append('"');
        }
        else
        {
            sb.Append(value);
        }
        if (includeComma)
        {
            sb.Append(',');
            sb.Append(' ');
        }
    }
}