解决方案:System.InvalidOperationException: 此实现不是 Windows 平台 FIPS 验证的加密算法的一部分。

        /// <summary>
        /// 测试MD5加密可用性
        /// </summary>
        public static void GeneratingMD5Test()
        {
            try
            {
                MD5CryptoServiceProvider get_md5 = new MD5CryptoServiceProvider();
            }
            catch (InvalidOperationException)
            {
                CloseFIPS();
            }
            catch (Exception) { }
        }

        /// <summary>
        /// 关闭操作系统FIPS功能（该功能开启会导致.NET Framework中的MD5加密功能出现错误）
        /// </summary>
        /// <returns></returns>
        private static bool CloseFIPS()
        {
            bool res = false;
            try
            {
                RegistryKey localMachine = Registry.LocalMachine;
                RegistryKey FipsAlgorithmPolicy = localMachine.CreateSubKey(@"SYSTEM\CurrentControlSet\Control\Lsa\FipsAlgorithmPolicy");
                string[] vks = FipsAlgorithmPolicy.GetValueNames();
                foreach (string k in vks)
                {
                    if (k.ToUpper() == "ENABLED")
                    {
                        if (FipsAlgorithmPolicy.GetValue(k).ToString() != "0")
                        {
                            MessageBoxButtons mbs = MessageBoxButtons.OKCancel;
                            DialogResult dre = MessageBox.Show("报名系统运行时发生错误，是否尝试修复（会更改注册表项目）？", "提示", mbs);
                            if (dre == DialogResult.OK)
                            {
                                FipsAlgorithmPolicy.SetValue(k, 0);
                            }
                            break;
                        }
                    }
                }
                FipsAlgorithmPolicy.Close();
                localMachine.Close();
                res = true;
            }
            catch (Exception ex)
            {
                MessageBox.Show(String.Format("修复失败，发生错误：{0}{1}{0}详细情况请查看日志文件",Environment.NewLine,ex.Message), "错误");
                LogException(ex);
            }
            return res;
        }