Question

I have a class that I define in inline C# in powershell:

Add-Type -TypeDefinition @"
    public class SomeClass {
        string name;
        public string Name { get { return name; } set { name = value; } }
        int a, b;
        public int A { get { return a; } set { a = value; } }
        public int B { get { return b; } set { b = value; } }
    }
"@

I can instantiate it:
$someClass= New-Object SomeClass -Property @{
‘Name’ = “Justin Dearing”;
“A” = 1;
“B” = 5;
};

But I cannot instantiate a list of it:

$listOfClasses = New-Object System.Collections.Generic.List[SomeClass];

Doing so gets me the following:

New-Object : Cannot find type [[System.Collections.Generic[SomeClass]]]: make sure the assembly containing this type is loaded.
At line:12 char:28
+ $listOfClasses = New-Object <<<<  [System.Collections.Generic[SomeClass]]
    + CategoryInfo          : InvalidType: (:) [New-Object], PSArgumentException
    + FullyQualifiedErrorId : TypeNotFound,Microsoft.PowerShell.Commands.NewObjectCommand

Answer 1

It seems that is not directly supported in PowerShell. Here is a solution, which provides a New-GenericObject script; that does some reflection in order to create the correct type.