using System;

using System.Collections.Generic;

using System.Linq;

​

IDocumentService service = new DocumentService();

​

var context = new AuthContext { UserId = "123abc" };

var anotherContext = new AuthContext { UserId = "456def" };

​

var id = service.CreateDocument(context, "test document");

Console.WriteLine(id);

​

var document = service.GetDocument(context, id);

Console.WriteLine(document);

​

var document2 = service.GetDocument(anotherContext, id);

Console.WriteLine(document2);

​

service.CreateDocument(context, "another document");

service.CreateDocument(anotherContext, "yet another document");

var documents = service.AllDocuments(context);

​

foreach(var doc in documents){

    Console.WriteLine(doc); 

}

​

// ------------------

​

public class AuthContext

{

    public string UserId { get; set; }

}

​

// This document service should create documents for users and return only their own documents

interface IDocumentService

{

    Guid CreateDocument(AuthContext context, string documentContents);

    string GetDocument(AuthContext context, Guid documentId);

    IEnumerable<string> AllDocuments(AuthContext context); 

}

​

​

public class DocumentService : IDocumentService 

{   

    // Implement the IDocumentService interface

}