Benchmarks_IDictionaryEnumerator.cs

using System;
using System.Collections;
using System.Linq;
using BenchmarkDotNet.Attributes;

[MemoryDiagnoser]
public class Benchmarks
{
    private readonly IDictionary _dict = Enumerable.Range(0, 10000).ToDictionary(i => i.ToString(), i => string.Empty);

    [Benchmark]
    public void DictionaryEntry()
    {
        foreach (DictionaryEntry entry in _dict)
        {
            _ = (string)entry.Value;
        }
    }

    [Benchmark]
    public void IDictionaryEnumerator()
    {
        IDictionaryEnumerator e = _dict.GetEnumerator();
        try
        {
            while (e.MoveNext())
            {
                DictionaryEntry entry = e.Entry;
                _ = (string)entry.Value;
            }
        }
        finally
        {
            (e as IDisposable)?.Dispose();
        }
    }
}