How do I create a .NET List?

[reformedView]

So how do you get the .NET constant initialized to a list of strings?  Did you do a Create->Constant somewhere, or can you specify a refnum's class by name?

Thanks,

Nathan

[ChacAttack]

Hello Nathan,

Thank you for your question regarding .NET. I am just wondering if you can elaborate on your question and/or post a screenshot of your code so that we can better assist you.

[reformedView]

I was referring to the OP's answer in message 2, which has a screenshot including a specific .NET refnum constant. How did he get it?  I have a temporary workaround where I make a .NET DLL with the desired refnum type as an output, from which I simply create a constant.  If there is a way of specifying the type by string, that would be a little cleaner, as much as I relish the oppurtunity to pull up Visual Studio 🙂

[ChacAttack]

Hello Nathan,

Thank you for clarifying. You can create a list using an enum, then you can convert the output of the enum to a string and use that as the constant for the .NET refnum. You can find this here: Enum to String. You would be replacing the string constant in the sample OP provided with that conversion (that results in a string constant as defined by the enum. Please let me know if this helps answer your question.

[JonDieringer]

I know that this thread is quite old but it was helpful for my application. I think the issue Garousi was having, and myself as well with the null pointer exception, is that the example has a space in between List` 1 where it should be List`1. Once I found that, the example worked like a charm.

So:

System.Collections.Generic.List` 1[System.String]

should be:

System.Collections.Generic.List`1[System.String]

You can populate the .NET list using the add or insert methods in the invoke node.

Thanks for your solution to this Jim_Kring.

[mtitoo]

Could you please tell me how to get To More Specific Class  .NET reference (System.Collections.Generic.List`1[System.String])? I got every piece except that. 

[elcalverado]

Are you referring to the .NET reference wired into the top of the To More Specific Class function?

[KimT]

I guess he does... me having the same question

[hollowhorse]

I've been trying for ages to work out how to create an instance of an Enumerable list for use when defining the pipeline for a MongoDB aggregation (basically a list of BSON documents, which specify the operation in each stage in the aggregation).

This solved my problem.

Great stuff!.

[hollowhorse]

I've just realised that you can do this too...

For some reason I'd always overlooked this VI, but it seems pretty powerful.