Question

I have data being returned in a DataTable that looks like:

Department | EmployeeName

1 | Employee1

1 | Employee1

2 | Employee2

3 | Employee3

3 | Employee3

3 | Employee3

I’m trying to get only distinct rows and put it into a collection, like so:

IEnumerable<Department> departments = dt.AsEnumerable().Select(row =>
    new Department
        {
            DepartmentID = Int32.Parse(row["DepartmentID"].ToString()),
            Employee = new Employee { EmployeeName = row["EmployeeName"].ToString() }
        }).Distinct();

It should only return 3 rows, but instead it’s returning all 6.

What am I doing wrong here?

Answer 1

Not sure but one of the following may work for you ……….

just do this

var distrows= table1.AsEnumerable().Distinct();

will do your task……….than create collection of department form the distrow..

IEnumerable<Department> departments = (from DataRow dRow in distrows   
                         new Department
        {
            DepartmentID = Int32.Parse(row["DepartmentID"].ToString()),
            Employee = new Employee { EmployeeName = row["EmployeeName"].ToString() }
        });

OR

var distinctRows = (from DataRow dRow in dTable.Rows
            select new {col1=dRow["dataColumn1"],col2=dRow["dataColumn2"]}).Distinct();


IEnumerable<Department> departments = (from DataRow dRow in distrows   
                             new Department
            {
                DepartmentID = Int32.Parse(distinctRows.col1),
                Employee = new Employee { EmployeeName = distinctRows.col2.ToString() }
            });