Powershell folder creation - powershell

Question

I have a powershell script that creates folders on our NAS for each student according to their student numbers. The names for the folders comes from a .csv file that I import from the server. This is what I have got:
Set-Location "C:\studentdata"
$StudFolders = import-csv \\servername\datafolder\studfolders.csv
ForEach ($StudFolders in $StudFolders) {
if(Test-Path -Path C:\Studentdata\$StudFolders) {
New-Item $StudFolders.Name -type directory
}else{
"Folders already created"
}
}
This script works great, if I run it only once. If I run it again, I get errors in the console window about the folders already existing. What I want to do is catch the errors with the IF part of the script, but I am not sure if I have the correct usage of the IF for powershell. This will help if I edit the .csv with more student number it will display without errors.
Can someone point me in the right direction?
EDIT:
This is what I have in the studfolders.csv
Name
2003040052
2003060213
2003060310
2003060467

Answer 1

Lets take a look at your logic:
you are using an if statement, which works if something returns true
you are using a test-path cmdlet which returns true if something exists
See the problem? you need to do it vice versa:
if (!(test-path ...)) { ... } # ! - is the operator to invert true to false
or you can switch if and else content, so when if executes it returns "Folders already created", and else creates folders

Answer 2

As a matter of coding style, I would avoid using the same variable name with different semantics, as in ($Studfolders in $Studfolders). Code like this is very hard to read a few months down the road. I generally use the singular for each object in the collection, as in ($Studfolder in $Studfolders). But if your style works for you, OK.
Previous answers have already pointed out that your logic is backwards. You need to reverse it.
Next, it doesn't look to me as though you are accessing the component of each item in the loop. When you do an Import-Csv, several things happen: The first record in the csv file is treated as a header, providing the names for the fields that follow. If there is indeed a header in your csv file, you need to reference it when you retrieve the first field from each item, even if it's the only field.
The result of an import-csv is an array of custom objects. Each custom object looks like a hashtable that contains key, value pairs. Something like this might work
Set-Location "C:\studentdata"
$StudFolders = import-csv \\servername\datafolder\studfolders.csv
ForEach ($StudFolder in $StudFolders) {
if(Test-Path -Path C:\Studentdata\$StudFolder.Name) {
"Folders already created"
}else{
New-Item $StudFolder.Name -type directory
}
}
I have presumed that the first record in the Csv file looks like this:
"Name"
That is why I referenced the field as $Studfolder.Name"
If this isn't the case, you are going to have to do something different.

Answer 3

Having tried everything with the script, I could not get it to catch the errors. I decided to ask my manager, and he came up with the following solution that works quite well and catches the errors.
import-csv '\\servername\datafolder\studfolders.csv'|ForEach-Object -process {
$path =$_.Name
$path='C:\Studentdata\'+$path
if (Test-Path -Path $path){
"Folder already created"
} else {
New-Item $path -type directory
}
}
Thanks to #Walter Mitty and #4c74356b41 for help try to find an answer.