在Linq中复制SQL数据

Question

I have a table in a SQL database which has a ID column (auto incrementing) and is set to be the primary key. The table consists of this ID and an account name.

I then have a bit of code which reads this table and populates a listview with the data. The problem is, if I order by the account name - I get duplicates listed in the listview. If I order it by the ID, I don't see any duplicates.

The original data in the SQL database contains no duplicate account names, so obviously that's what i'd like to see in the listview.

This is the Linq i'm using to grab the data...

    public static IEnumerable<Client2> GetClientList()
    {
        return (IEnumerable<Client2>)from c in entity.Client2s
                                    orderby c.AccountName
                                    select c;
    }

And this is the code which is being used to create the listview...

        // Clear the listview
        listViewClient.Items.Clear();

        // Get imported client list from database
        foreach (Client2 c in SQLHandler.GetClientList())
        {
            ListViewItemClient lvi = new ListViewItemClient(c.AccountName, c);
            listViewClient.Items.Add(lvi);
        }

As I say, if I change this to orderby c.ID then it returns data as expected. I've also tried adding an index to AccountName. I do use a custom listview item subclass, but all that does is store a reference to the Client object.

Any idea how I can resolve this?

Thanks,

Answer 1

Just to clarify for anyone else potentially reading this issue, it was programmer error. My data did indeed contain duplicates but because of the sort order, they weren't listed together and therefore I didn't see them when manually checking the data. It was only when I started displaying the ID that I realised they weren't sequential.