C＃使用接口对dataTable行进行排序

Question

Here is my code for how I get data from a database and add it to a DataTable named data, I have to sort this all table by data of row "Spelionu skaicius" using interface (increasingly), but I have no idea how to realize that, can someone help with that? i know there is a lotof ways to sort this, but i have to make this using interface.

using (FbConnection fbBD = new FbConnection(csb.ToString()))
{
    fbBD.Open();
    FbTransaction transact = fbBD.BeginTransaction();
    FbCommand sqlReq =
        new FbCommand("SELECT vardas,pavarde,sp_skaicius,spelioniu_sk FROM zaidejai WHERE atspetas='Taip'", fbBD, transact);
    using (FbDataReader r = sqlReq.ExecuteReader())
    {
        while (r.Read())
        {
            DataRow rw = dt.NewRow();
            rw["Vardas"] = r.GetString(0);
            rw["Pavarde"] = r.GetString(1);
            rw["Skaicius"] = r.GetValue(2);
            rw["Spelionu skaicius"] = r.GetValue(3);
            data.Rows.Add(rw);
        }
    }
    transact.Commit();
    fbBD.Close();
}

PS sorry for my English

Answer 1

use the datatable DefaultView property:

data.DefaultView.Sort = "Spelionu skaicius";

you can then work with data.DefaultView (a dataview) or if you need a datatable, you can do this:

data = data.DefaultView.ToTable();

<-- EDIT -->

The above is for regular sorting. If you want to use IComparable, you will have to use custom clases in stead of DataTable. Here 's an explanation of how.

Answer 2

It's best if you let the database sort the data so instead, I would change your select to this:

    SELECT vardas,pavarde,sp_skaicius,spelioniu_sk 
    FROM zaidejai 
    WHERE atspetas='Taip'
    ORDER BY spelioniu_sk

Note that I used spelioniu_sk because that's the 4th column listed on your select which is then mapped to Spelionu skaicius in your datatable definition

If you still must sort the datatable after you've gotten the data from the database, perhaps in a different order, you can use the DataView propery of the DataTable as so:

data= data.DefaultView.Sort = "`Spelionu skaicius` ASC";

OR

data = data.DefaultView.Sort = "`Spelionu skaicius` DESC";

Depending on the order that you need to sort by.

Note: I am not sure whether the above Sort Expression will work fine. Since you have decided to name your column with a space in the middle, you may need to enclose the 2 words in either backquotes (as I did above) or maybe square brackets (eg [Spelionu skaicius] ASC )