I am trying to delete a specific row from datatable. When adding the last row, I need to delete the yellow colored rows. It is very easy to Select from a datatable like below
DataRow[] dr = dt.Select("STOK_KODU='HAMMADDE_2'");
I was wondering if there is a way like below to delete ??? Or would you advice an easy way to delete a rows from datatable?
dt.Delete("STOK_KODU='HAMMADDE_2'");
One way is to recreate the table with the rows you want to keep:
dt = dt.AsEnumerable()
.Where(row => row.Field<string>("STOK_KODU") != "HAMMADDE_2")
.CopyToDataTable()
The other is to use DataRowCollection.Remove:
DataRow[] rowsToRemove = dt.Select("STOK_KODU='HAMMADDE_2'");
foreach (var rowToDelete in rowsToRemove)
dt.Rows.Remove(rowToDelete);
The second approach is more efficient if you want to delete few rows and the table is large. The first approach using LINQ is more powerful since you can use any code but it can be less efficient.
You can access the Rows collection of the DataTable:
foreach (var row in dr)
dt.Rows.Remove(row);
try this ::
DataRow[] rows;
rows=dt.Select("STOK_KODU='HAMMADDE_2'");
foreach(DataRow r in rows)
r.Delete();
DataAdapter). It will just set the rowstate to Deleted which is a flag for a DataAdapter.
Rows.RemoveDeleting rows from an in memory DataTable object is really easy
dt.Select("STOK_KODU='HAMMADDE_2'").AsEnumerable().ToList().ForEach(x => x.Delete());
However you should consider that the Delete method simply marks the RowState to Deleted, but the rows are still in the DataTable.Rows collection. To really remove them you need to call
dt.AcceptChanges();
without this call, if you loop over the datatable rows collection, you need to check the RowState to avoid an error message stating that you cannot access the information of a deleted row
foreach(DataRow r in dt.Rows)
{
if(r.RowState != DataRowState.Deleted)
Console.WriteLine(r[0].ToString());
}
DataTable.AcceptChanges does not remove the rows which have RowState=Deleted. It will make the RowState=Unchanged. It's just a flag for a DataAdapter which wil call AcceptChanges itself after it has updated the datasource. You can check that easily by inspecting dt.GetChanges() in the debugger before and after you've called AcceptChanges.