In programming, it’s very common to convert a collection of words into a delimited string, with commas often used to separate each element. The example below illustrates this using a StringBuilder:

var sb = new StringBuilder();

foreach (var item in words)
{
    if (sb.Length > 0)
    {
        _ = sb.Append(ControlChars.Comma);
    }

    _ = sb.Append($"{item.Key}: {item.Value}"
                  .ToString(CultureInfo.CurrentCulture));
}

return sb.ToString();

In Spargine, I introduced a method called ToDelimitedString() in FastStringBuilder to encapsulate this functionality as an extension method. Let’s examine its performance.

Benchmark Results

The benchmark tests reveal that ToDelimitedString() is 1.23 times more performant and allocates less memory. This improvement in performance is achieved by leveraging a source generator.

Allocations: Normal: 1,320 – 120,768 bytes, ToDelmitedString(): 200 – 48, 728 bytes.

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