using System.Data;

​

using System.Data.SqlClient;

using System.IO;

​

using Microsoft.SqlServer.Management.Common;

using Microsoft.SqlServer.Management.Smo;

​

public class IJustWantAFunctionMyGod

{

    public void RestoreExternalSystem()

    {

        var databaseToBackup    = "The database to back up";

        var databaseToRestoreTo = "The name of the database to restore";

        var databaseBackupPath  = "The path of where to back the aforementioned database up";

​

        if (!databaseBackupPath.EndsWith(Path.DirectorySeparatorChar.ToString()) 

            || !databaseBackupPath.EndsWith(Path.AltDirectorySeparatorChar.ToString()))

        {

            databaseBackupPath += Path.DirectorySeparatorChar.ToString();

        }

​

        databaseBackupPath += $"{databaseToBackup}.bak";

​

        var sqlConnection = new SqlConnection("Some connection string");

​

        var serverConnection = new ServerConnection(sqlConnection);

        var server           = new Server(serverConnection);

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        var backup = new Backup

        {

            Action   = BackupActionType.Database,

            Database = databaseToBackup

        };

​

        var backupDeviceItem = new BackupDeviceItem(databaseBackupPath, DeviceType.File);

​

        backup.Devices.Add(backupDeviceItem);

​

        backup.SqlBackup(server);

​

        var restore = new Restore

        {

            Action   = RestoreActionType.Database, 

            Database = databaseToRestoreTo

        };

​

        restore.Devices.Add(backupDeviceItem);

        restore.ReplaceDatabase = true;

​

        foreach (DataRow row in restore.ReadFileList(server).Rows)

        {

            var relocateFile = new RelocateFile

            {

                LogicalFileName = row["LogicalName"].ToString()

            };

​

            var physicalName = row["PhysicalName"].ToString();

            var path         = Path.GetDirectoryName(physicalName);

            var fileName     = Path.GetFileName(physicalName);

​

            if (string.IsNullOrWhiteSpace(path))

            {

                throw new DirectoryNotFoundException(path);

            }

​

            physicalName = Path.Combine(path, $"{databaseToRestoreTo}_{fileName}");

​

            relocateFile.PhysicalFileName = physicalName;

​

            restore.RelocateFiles.Add(relocateFile);

        }

​

        restore.SqlRestore(server);

​

        serverConnection.Disconnect();

    }

}

​

​