qdr.fnd/qdr.fnd.core/IO/Extensions/FileInfoExt.cs

using System;
using System.IO;
using System.IO.Abstractions;
using System.Security.Cryptography;

namespace Quadarax.Foundation.Core.IO.Extensions
{
    public static class FileInfoExt
    {
        public static string GetCalculatedHash(this IFileInfo fileInfo, HashAlgorithm algorithm)
        {
            if (fileInfo == null)
                throw new ArgumentNullException(nameof(fileInfo));
            
            if (algorithm==null)
                throw new ArgumentNullException(nameof(algorithm));
            
            
            using (var stream = fileInfo.Open(FileMode.Open,FileAccess.Read, FileShare.ReadWrite))
            {
                return stream.GetStreamCalculatedHash(algorithm);
            }
        }
    }
}