Initialize C# List<T> from IronPython?

Question

I have a relatively deep object tree in C# that needs to be initialized from IronPython.

I'm new to python and I'm struggling with the initialization of arrays.

So as an example - say I have these classes in C#

public class Class1
{
    public string Foo {get;set;}
}

public class Class2
{
    List<Class1> ClassOnes {get;set;}
}

I can initialize the array in Class2 like so:

var class2 = new Class2(
    ClassOnes = new List<Class1>()
    {
        new Class1(Foo="bar")
    });

In IronPython - I was trying this:

bar = Class2
bar.ClassOnes = Class1[Class1(Foo="bar")]

But I always get this message:

expected Array[Type], got Class1

Any ideas?

Cameron · Accepted Answer · 2011-08-06 00:27:36Z

15

You have a couple issues here. First, you're setting bar to the class object Class2 (classes are first-class objects in Python).

You meant to create an instance, like this (with parentheses):

bar = Class2()

To create a List<T> in IronPython, you can do:

from System.Collections.Generic import List

# Generic types in IronPython are supported with array-subscript syntax
bar.ClassOnes = List[Class1]()
bar.ClassOnes.Add(Class1())

answered Aug 6, 2011 at 0:27

Cameron

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1 Comment

Chad Brockman Over a year ago

If you were here - I'd buy you a beer.

Chad Brockman · Accepted Answer · 2011-08-06 00:37:57Z

7

Made a mistake on the Class2() -- that's what I get for making an example instead of posting real code!!!

For what it's worth - I was able to initialize the List with actual instances like this:

from System.Collections.Generic import List

bar.ClassOnes = List[Class1]([Class1(Foo="bar")])

Thanks much Cameron!

answered Aug 6, 2011 at 0:37

Chad Brockman

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1 Comment

Cameron Over a year ago

No problem ;-) That snippet's interesting, it's creating a Python list with one object in it (a new Class1 object), which the List<T> constructor seems to accept as an IEnumerable to create items from. Cool!

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