Question

I am pulling some data from database by this line below:

IQueryable<user> UserList = DatabaseContext.Users.GetAll();

I want to seach something in UserList such as:

foreach (var User in UserList)
{
    if (User.type == (int)UserType.SuperUser)
    {
        IsRecordFound = true;
        break;
    }
}

Then i do something according to the state of flag:

if (!IsRecordFound)
{
    AesCrypto aesCrypto = new AesCrypto();
    user newuser = new user();
    newuser.username = DEFAULT_SUPER_USER_NAME;
    newuser.password = aesCrypto.Encrypt(DEFAULT_SUPER_USER_PASSWORD);
    newuser.type = (int)UserType.SuperUser;
    newuser.create_date = DateTime.Now;
    newuser.last_login = newuser.create_date;
    newuser.email_address = DEFAULT_SUPER_USER_EMAIL_ADDR;
    newuser.login_count = 1;

    DatabaseContext.Users.Add(newuser);
    if (!DatabaseContext.Save())
        return false;
}

Is there any easy or practical way to seach in IQueryable interface by using LINQ or something else?

Answer 1

if (!UserList.Any(x => x.Type == (int)UserType.SuperUser))
{
    AesCrypto aesCrypto = new AesCrypto();
    user newuser = new user();
    newuser.username = DEFAULT_SUPER_USER_NAME;
    newuser.password = aesCrypto.Encrypt(DEFAULT_SUPER_USER_PASSWORD);
    newuser.type = (int)UserType.SuperUser;
    newuser.create_date = DateTime.Now;
    newuser.last_login = newuser.create_date;
    newuser.email_address = DEFAULT_SUPER_USER_EMAIL_ADDR;
    newuser.login_count = 1;

    DatabaseContext.Users.Add(newuser);
    if (!DatabaseContext.Save())
        return false;
}