CODEWITHSUNDEEP
c#linq
jimmyjambles
jimmyjambles

Reputation: 1670

Sorting rows in datatable

I have a datatable where I would like to move all the rows that have a certain firstname and lastname to the top of the table.

public DataTable SortByFirstNameAndLastNameMatch(DataTable table, string firstName, string lastName)
    {
        DataTable ret = new DataTable();
        foreach (DataRow dataRow in table.Rows)
        {
            if (dataRow["NomArtiste"].ToString().ToLower() == lastName.ToLower() && dataRow["PrenomArtiste"].ToString().ToLower() == firstName.ToLower())
            {
                ret.ImportRow(dataRow);
            }
        }

        ret.Merge(table);
        return RemoveDuplicateRows(ret, "AlbumID");
    }

Is there a way I can do this using a linq expression or a comparer without making a new datatable?

Upvotes: 4

Views: 128

Answers (3)

bilal_izloo
bilal_izloo

Reputation: 37

DataView dv=datatable.DefaultView;
dv.Sort = "ColumnName Asc ,ColumnName Asc, ColumnName Asc , ColumnName Asc";
datatable=dv.toTable().Copy();

Upvotes: 0

Tarik
Tarik

Reputation: 11209

You can create a new DataView on your DataTable and apply whatever sorting and filtering you see fit. See http://msdn.microsoft.com/en-us/library/system.data.dataview.sort.aspx for an example.

Alternatively you can do it with LINQ:

var sortedTableQuery = table.OrderBy(r => r["NomArtiste"].ToString() == lastName ? 0 : 1).ThenBy(r => r["PrenomArtiste"].ToString() == firstName ? 0 : 1).ThenBy(r => r["NomArtiste"].ToString()).ThenBy(r => r["PrenomArtiste"].ToString());
var a = sortedTableQuery.ToArray();

Upvotes: 3

tclark333
tclark333

Reputation: 567

In Linq, it would look something like this:

var sortedNames = unsortedNames.OrderBy(n => n == lastName ? 1 : 2).ThenBy(n => n == firstName ? 1 : 2));

Upvotes: 2

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