推荐订阅源

using System.IO;
using System.Text;namespace FileService
{
    public static class ExtensionMethods
    {
        public static string MD5Code(this FileInfo fileInfo)
        {
            var data = fileInfo.BinaryData();byte[] hash = new System.Security.Cryptography.MD5CryptoServiceProvider().ComputeHash(data);

            var builder 

= new StringBuilder();foreach (var b in hash)
            {
                builder.AppendFormat("{0:x2}", b);
            }
            return builder.ToString();
        }public static byte[] BinaryData(this FileInfo fileInfo)
        {
            return File.ReadAllBytes(fileInfo.FullName);
        }

    }
}

抓檔案的binary 及 MD5