Creating a script with List

Question

I'm attempting to create a script with Microsoft.CodeAnalysis.CSharp.Scripting. As soon as I add List<> the code errors. I thought I had all the necessary references and usings included, however it still errors stating The type or namespace name 'List<>' could not be found (are you missing a using directive or an assembly reference?

These are my usings in the code

using Microsoft.CodeAnalysis.CSharp.Scripting;
using Microsoft.CodeAnalysis.Scripting;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Diagnostics;

Below is my example unit test

[TestMethod]
public void RunGenericListTest()
{
    var code = @"
List<string> strings = new List<string>();
strings.Add(""test string"");            
return output;";

    var options = ScriptOptions.Default;

    options.WithReferences(typeof(System.Collections.CollectionBase).Assembly);
    options.WithReferences(typeof(System.Collections.Generic.List<>).Assembly);
    options.WithImports("System.Collections");
    options.WithImports("System.Collections.Generic");

    var result = CSharpScript.RunAsync(code, options).Result;

    Debug.WriteLine(result);
}

This errors on the CSharpScript.RunAsync every time. Can someone enlighten me on what I'm missing?

Fair play for including a unit test. It's nice to see questions with minimal, reproducible examples. — Connell.O'Donnell
– Connell.O'Donnell, Commented Nov 20, 2020 at 10:26

timur · Accepted Answer · 2020-11-20 10:27:09Z

1

I think the issue is, WithImports does not mutate options but rather returns a copy

var code = @"
List<string> strings = new List<string>();
strings.Add(""test string"");            
return strings;";

    var options = ScriptOptions.Default
                .WithImports("System.Collections.Generic"); // chaining methods would work better here.
    // alternatively reassign the variable:
    // options = options.WithImports("System.Collections.Generic");

    var result = CSharpScript.RunAsync(code, options).Result;

    Debug.WriteLine((result.ReturnValue as List<string>).First());

answered Nov 20, 2020 at 10:27

timur

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2 Comments

Thundter Over a year ago

So its a syntax error. I didn't realise that the options wasn't being added to if you didn't reassign it to itself. The returns a copy link was a little difficult to understand initially but was also helpful. Thanks

timur Over a year ago

@Thundter I'm sorry I couldn't find this class in the documentation. Had to go to the source

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