Database.EnsureCreated似乎不是在创建数据库（xamarin.forms）

Question

I'm making a simple app using EntityFramework and Sqlite as database to add and save the person into the data base and add it to a ListView, or delete it.

I have a Db class, and in the constructor method i used the method called

Database.EnsureCreated()

to make my database. And in the MainPage.xaml.cs i made an instance of the Db class(db) and i wanted to get all the Workers table in my database and pass it as the ItemSource of a ListView. Also i'm doing these in OnAppearing() method to show my ListView items on the startup, but i face this exception error:

Microsoft.Data.Sqlite.SqliteExceptions: 'SQLite Error 1: 'no such table:Workers'.'

(see the image below)

enter image description here

That it seems the Database.EnsureCreated() is not creating my database. or maybe it creates my database but it can't create the tables for some reasons and i want to know those reasons

And here's my Db class:

enter image description here

And this is my db_path: Android :

        string FileName = "Workers.sqlite";
    string FileLocation = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
    string db_path = Path.Combine(FileLocation, FileName);

And the iOS :

            string FileName = "Workers.sqlite";
        string FileLocation = Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "..", "Library");
        string db_path = Path.Combine(FileLocation, FileName);

So what is the problem with the database and table creation?

Answer 1

I just added using keyword to those lines and it fixed it unexpectedly.

(I also removed some of those db_path variables and made the db_path source cleaner and more fluent by getting it from the App class).

Now the code looks like this:

        using (Db db = new Db(App.db_path))
        {
            List<Worker> AllWorkers = db.Workers.ToList();
            WorkersListView.ItemsSource = AllWorkers;
        }