Question

I’ve been trying to find an answer online but I’m working with a DataTable and I want to filter all rows based on the column name in the table but I can’t seem to get the filterExpression to work. Even though the syntax is wrong, this is basically what I want it to do….

DataRow[] row = sqlDT.Select(ColumnName = “Foo”, “ASC”, DataViewRowState.CurrentRows);

Thanks so much.

Answer 1

There are a few ways to accomplish this. I would suggest using LINQ to filter the rows:

sqlDT = sqlDT.AsEnumerable().Where(r => r.Field<string>("ColumnName") == "Foo").CopyToDataTable();

You can also use the Select method or the DefaultView.RowFilter property:

//select method
sqlDT = sqlDT.Select("ColumnName = 'Foo'").CopyToDataTable();

//row filter property
sqlDT.DefaultView.RowFilter = "ColumnName = 'Foo'";
sqlDT = sqlDT.DefaultView.ToTable();

EDIT

If you just want to filter out unneeded columns, use the DefaultView.ToTable() method:

sqlDT = sqlDT.DefaultView.ToTable(false, "Column1", "Column2", "Column3");