Memory Efficiency and Performance of String.Replace .NET Framework

Question

 string str1 = \"12345ABC...\\\\...ABC100000\"; 
 // Hypothetically huge string of 100000 + Unicode Chars
 str1 = str1.Replace(\"1\", string.Empty);
 str1 = str1.Rep         


        

Answer 1

Here's a quick benchmark...

        Stopwatch s = new Stopwatch();
        s.Start();
        string replace = source;
        replace = replace.Replace("$TS$", tsValue);
        replace = replace.Replace("$DOC$", docValue);
        s.Stop();

        Console.WriteLine("String.Replace:\t\t" + s.ElapsedMilliseconds);

        s.Reset();

        s.Start();
        StringBuilder sb = new StringBuilder(source);
        sb = sb.Replace("$TS$", tsValue);
        sb = sb.Replace("$DOC$", docValue);
        string output = sb.ToString();
        s.Stop();

        Console.WriteLine("StringBuilder.Replace:\t\t" + s.ElapsedMilliseconds);

I didn't see much difference on my machine (string.replace was 85ms and stringbuilder.replace was 80), and that was against about 8MB of text in "source"...