Cannot bind RelocateFile when using Restore-SqlDatabase cmdlet

I know this is old, but I've come across the same issue.

PS C:\> [AppDomain]::CurrentDomain.GetAssemblies().GetTypes() | ? FullName -eq Microsoft.SqlServer.Management.Smo.RelocateFile | select Assembly

Assembly

• Microsoft.SqlServer.SmoExtended, Version=13.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91

• Microsoft.SqlServer.SmoExtended, Version=12.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91

New-Object "Microsoft.SqlServer.Management.Smo.RelocateFile, Microsoft.SqlServer.SmoExtended, Version=12.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" (*LogicalName*, *PhysicalName*)

Doing it that way, with a fully qualified type name, solves the issue.

Hopefully this will help someone else who finds this question.

You can do this in a version-independent way:

$sqlServerSnapinVersion = (Get-Command Restore-SqlDatabase).ImplementingType.Assembly.GetName().Version.ToString()
$assemblySqlServerSmoExtendedFullName = "Microsoft.SqlServer.SmoExtended, Version=$sqlServerSnapinVersion, Culture=neutral, PublicKeyToken=89845dcd8080cc91"

$mdf = New-Object "Microsoft.SqlServer.Management.Smo.RelocateFile, $assemblySqlServerSmoExtendedFullName"('MyDb_Data', "$defaultDatabaseRootPath\$solutionName\$newDatabase.mdf")
$ldf = New-Object "Microsoft.SqlServer.Management.Smo.RelocateFile, $assemblySqlServerSmoExtendedFullName"('MyDb_Log', "$defaultDatabaseRootPath\$solutionName\$newDatabase.ldf")

restore-sqldatabase -serverinstance $defaultServerInstance -database $newDatabase -backupfile $backupFile -RelocateFile @($mdf,$ldf)