using System;

using Microsoft.CodeAnalysis;

using Microsoft.CodeAnalysis.Completion;

using Microsoft.CodeAnalysis.CSharp;

using Microsoft.CodeAnalysis.Host.Mef;

using Microsoft.CodeAnalysis.Text;

​

using var workspace = new AdhocWorkspace(MefHostServices.DefaultHost);

var compilationOptions = new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary, nullableContextOptions: NullableContextOptions.Annotations)

    .WithUsings(new[]{ "System" });

​

var projectInfo = ProjectInfo.Create(

    ProjectId.CreateNewId(),

    VersionStamp.Create(),

    "dotnet-exec-repl",

    "dotnet-exec-repl",

    LanguageNames.CSharp,

    isSubmission: true)

    .WithMetadataReferences([MetadataReference.CreateFromFile(typeof(object).Assembly.Location)])

    .WithCompilationOptions(compilationOptions)

    ;

var project = workspace.AddProject(projectInfo);

​

var combinedCode = "Guid.";

​

var documentInfo = DocumentInfo.Create(

    DocumentId.CreateNewId(project.Id), "__Script.cs",

    sourceCodeKind: SourceCodeKind.Script,

    loader: TextLoader.From(TextAndVersion.Create(SourceText.From(combinedCode), VersionStamp.Default)));

var document = workspace.AddDocument(documentInfo);

​

var completionService = CompletionService.GetService(document);

if (completionService is null)

{

    Console.WriteLine("CompletionService is null");

    return;

}

​

var completions = await completionService.GetCompletionsAsync(document, combinedCode.Length);

foreach (var completion in completions.ItemsList)

{

    Console.WriteLine(completion.DisplayText);

}