Delete localdb in Entity Framework Code First

Question

I am writing some UnitTests with NUnit and Entity Framework. How to delete the whole localdb database from Entity Framework level?

Note: I don't want to clear the tables' data. I want to delete the whole database.

Also I am able to create a localdb file in my application working directory provided the database had not been created:

string path = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "");
var testDbFileName = String.Format(@"UnitTestDB.mdf");
var testDbFileNameWithPath = path + @"\" + testDbFileName;

var connectionString =
String.Format(
    @"Data Source=(localdb)\V11.0;Initial Catalog={0};Integrated Security=True;AttachDBFilename={1};MultipleActiveResultSets=True",
    "UnitTestDB", testDbFileNameWithPath);

//Here would be the code passing connection string to DbContext and so on..

Deleting only the file "UnitTestDB.mdf" is not enough. There is still a reference to the db in SQL Management Studio

Answer 1

There are 2 ways to do this in code. Stick to EF code first if you can :-)

1) EF has a nice option on the context.

 Context.Database.Delete()

2) if you want old school SQLCommand/SqlConnection approach something like this hack routine...

 public  bool DropDB(string DBName, string ConnectionString)
    {

        SqlConnection conn = null;
        SqlCommand cmd = null;
        string stmt = null;

        int rowCount = 0;

        if (string.IsNullOrEmpty(DBName))
            throw new ArgumentNullException(DBName, "DBName required");

        try
        {
            conn = new SqlConnection(ConnectionString);

           stmt = "DROP DATABASE " + DBName ;

            cmd = new SqlCommand(stmt, conn);
            conn.Open();
            rowCount = cmd.ExecuteNonQuery();
            conn.Close();
        }
        catch (Exception)
        {
            //todo  whatever
            throw;
        }
        finally
        {
            if (conn != null) conn.Dispose();
            if (cmd != null) conn.Dispose();
        }
        if (rowCount == -1) return true;
        return false;
    }