sqlexpress 备份和还原时候：备份对于服务器“\\.\pipe\23B01ACD-73C3-49\tsql\query”失败。

sqlexpress 不支持  BackUp 和restore  sql 语句。进行备份和还原.

在网上找了一些例子。有一些问题。自己进行了简单修改 。现在能用了。现在分享出来。

   public class DataOperationBackUp
    {
        public static string ConStr = ConfigurationManager.AppSettings["ConStr"].ToString();

        public static void BackupDatabase(string sConnect,string filename)
        {
                string dbName;
                var filenamestr = @"D:\SampleBackup.bak";
                using (SqlConnection cnn = new SqlConnection(sConnect))
                {
                    cnn.Open();
                    dbName = cnn.Database.ToString();

                    ServerConnection sc = new ServerConnection(cnn);
                    Server sv = new Server(sc);

                    // Check that I'm connected to the user instance
                    Console.WriteLine(sv.InstanceName.ToString());

                    // Create backup device item for the backup
                    BackupDeviceItem bdi = new BackupDeviceItem(filenamestr, DeviceType.File);

                    // Create the backup informaton
                    Backup bk = new Backup();
                    bk.Devices.Add(bdi);
                    bk.Action = BackupActionType.Database;
                    bk.BackupSetDescription = "SQL Express is a great product!";
                    bk.BackupSetName = "SampleBackupSet";
                    bk.Database = dbName;
                    DateTime now = new DateTime();
                   // bk.ExpirationDate = now.AddMonths(1);
                    bk.LogTruncation = BackupTruncateLogType.Truncate;
                    bk.Initialize = true;
                    bk.Checksum = true;
    
                    // Run the backup
                    bk.SqlBackup(sv);
                    Console.WriteLine("Your backup is complete.");
                }
            
           
        }

        public static void RestoreBackup(string sConnect,string fileName)
        {
            string dbName;
            var filenamestr = @"D:\SampleBackup.bak";
            using (SqlConnection cnn = new SqlConnection(sConnect))
            {
                cnn.Open();   
                dbName = cnn.Database.ToString();

                // 此处先要执行下这条sql 要不会     产生因为数据库正在使用，所以无法获得对数据库的独占访问权
                string cmdText = "use master  alter database "+dbName+" set SINGLE_USER with ROLLBACK IMMEDIATE ";
                SqlCommand sqlcommand = new SqlCommand(cmdText, cnn);
                sqlcommand.ExecuteScalar();
                cnn.ChangeDatabase("master");
         
                ServerConnection sc = new ServerConnection(cnn);
                Server sv = new Server(sc);

                // Check that I'm connected to the user instance
                Console.WriteLine(sv.InstanceName.ToString());

                // Create backup device item for the backup
                BackupDeviceItem bdi = new BackupDeviceItem(filenamestr, DeviceType.File);

                // Create the restore object
                Restore resDB = new Restore();
                resDB.Devices.Add(bdi);
                resDB.NoRecovery = false;
                resDB.ReplaceDatabase = true;
                resDB.Database = dbName;
                //cnn.Close();
                // Restore the database
                resDB.SqlRestore(sv);
                Console.WriteLine("Your database has been restored.");
            }
        }
    }

当中遇到了很多问题。刚开始的没注意。爆出来的错误都是   备份对于服务器“\\.\pipe\23B01ACD-73C3-49\tsql\query”失败。

这时候你需要打开异常查看 innerexception 具体原因：

错误1：混合模式程序集是针对“v2.0.50727”版的运行时生成的，在没有配置其他信息的情况下，无法在 4.0 运行时中加载该程序集
添加配置文件解决

修改配置文件

  <startup useLegacyV2RuntimeActivationPolicy="true">

    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>

  </startup>

还原的时候产生了
因为数据库正在使用，所以无法获得对数据库的独占访问权

执行这一句

   string cmdText = "use master  alter database "+dbName+" set SINGLE_USER with ROLLBACK IMMEDIATE ";
                SqlCommand sqlcommand = new SqlCommand(cmdText, cnn);
                sqlcommand.ExecuteScalar();

配置sqlexpress 数据库的时候还需要注意下连接字符串：

data source=.\SQLEXPRESS1;attachdbfilename=|DataDirectory|\ktvsystem.mdf;Initial Catalog=ktvsystem;integrated security=True;user instance=True;multipleactiveresultsets=True;

需要配置下Initial Catalog 这个属性。 要不数据库里面上面产生的dbname字段：带有绝对路径。如 c:\test\ktvsystem.mdf ; 这样执行"use master  alter database "+dbName+" set SINGLE_USER with ROLLBACK IMMEDIATE "; 这条sql 会报错。。配置了Initial Catalog 就没其他什么问题了