MD5CryptoServiceProvider已过时:Derived cryptographic types are obsolete. Use the Create method on the base type instead

/// <summary>
/// MD5加密，不可逆
/// </summary>
/// <param name="input">明文字符串</param>
/// <returns></returns>
public static string ToMD5(string input)
{
    using (MD5 md5 = MD5.Create())
    {
        byte[] inputBytes = Encoding.ASCII.GetBytes(input);
        byte[] hashBytes = md5.ComputeHash(inputBytes);

        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < hashBytes.Length; i++)
        {
            sb.Append(hashBytes[i].ToString("X2")); // Convert to hexadecimal
        }
        return sb.ToString().ToLower();
    }
}