using Add-Type in multiple scripts

Question

I have a code to import a dll to my scripts. But i'm copying this part of code in every script where I'm using this dll. I think this is not a good practice. What would be a good practice here to avoid code replication.

Example of what i'm doing:

function Backup-Database
{
    $pathSMO = "C:\Program Files\Microsoft SQL Server\110\SDK\Assemblies\Microsoft.SqlServer.Smo.dll"
    $pathSMOEx = "C:\Program Files\Microsoft SQL Server\110\SDK\Assemblies\Microsoft.SqlServer.SmoExtended.dll"
    #imports
    Add-Type -path $pathSMO
    Add-Type -path $pathSMOEx

    #other stuff...
}

function Restore-Database
{
    $pathSMO = "C:\Program Files\Microsoft SQL Server\110\SDK\Assemblies\Microsoft.SqlServer.Smo.dll"
    $pathSMOEx = "C:\Program Files\Microsoft SQL Server\110\SDK\Assemblies\Microsoft.SqlServer.SmoExtended.dll"
    #imports
    Add-Type -path $pathSMO
    Add-Type -path $pathSMOEx

    #other stuff...
}

Answer 1

Forgive me if i'm off base but you should just be able to move the type declaration above the functions and still have it accessible within the functions. Bastardizing example 1 from the TechNet for Add-Type

$source = @"
public class BasicTest
{
  public static int Add(int a, int b)
    {
        return (a + b);
    }
  public int Multiply(int a, int b)
    {
    return (a * b);
    }
}
"@

Add-Type -TypeDefinition $source

function test1{
    [BasicTest]::Add(4, 3)
}

Function test2{
    $basicTestObject = New-Object BasicTest
    $basicTestObject.Multiply(5, 2)
}

test1

test2 

Output from code above

7
10

As you can see the definition is outside the functions. Hopefully using the quote in proper context if the -NameSpace parameter is omitted then the type is generated in the global namespace.