DsJian.Mvc/Extensions/StringExtensions.cs

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// ================================================
// StringExtensions.cs, 字符串扩展
// Copyright (C) 2010 Benking
// mail:ben.wangzj@gmail.com
// website:http://www.dsjian.com/
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// ================================================

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;

namespace DsJian.Mvc.Extensions
{
    /// <summary>
    /// 字符串扩展
    /// </summary>
    public static class StringExtensions
    {
        /// <summary>
        /// MD5 Hash
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string ComputeHash(this string value)
        {
            string hash = value.ToLower();

            if (value != null)
            {
                UTF8Encoding encoding = new UTF8Encoding();
                byte[] buffer = new MD5CryptoServiceProvider().ComputeHash(encoding.GetBytes(hash));
                StringBuilder builder = new StringBuilder(buffer.Length * 2);
                for (int i = 0; i < buffer.Length; i++)
                {
                    builder.Append(buffer[i].ToString("X2"));
                }
                hash = builder.ToString().ToLower();
            }

            return hash;
        }
    }
}