StringBuilderAppend.cs

using System.Text;
using BenchmarkDotNet.Attributes;

namespace MicroBenchmarks.Strings;

[SimpleJob]
[MemoryDiagnoser]
public class StringBuilderAppend
{
    [Benchmark(Baseline = true)]
    public string AppendFormat()
    {
        var stringBuilder = new StringBuilder();
        stringBuilder.AppendFormat("Line {0}\n", 42);
        return stringBuilder.ToString();
    }
    
    [Benchmark]
    public string Append()
    {
        var stringBuilder = new StringBuilder();
        stringBuilder.Append($"Line {42}\n");
        return stringBuilder.ToString();
    }
}