Parallel ForEach on DataTable

Question

I would like to use the new Parallel.ForEach function to loop through a datatable and perform actions on each row. I am trying to convert the code below:

Answer 1

I had to modify Jon Skeet's answer to make it work.

Parallel.ForEach(dt.AsEnumerable<DataRowType>(), drow => {
     drow.SomeCol = "";
});

Answer 2

This way we can use Parallel.ForEach for Data table.

DataTable dtTest = new DataTable();
            dtTest.Columns.Add("ID",typeof(int));
            dtTest.Columns.Add("Name", typeof(string));
            dtTest.Columns.Add("Salary", typeof(int));

            DataRow dr = dtTest.NewRow();
            dr["ID"] = 1;
            dr["Name"] = "Rom";
            dr["Salary"] = "2000";
            dtTest.Rows.Add(dr);

            dr = dtTest.NewRow();
            dr["ID"] = 2;
            dr["Name"] = "David";
            dr["Salary"] = "5000";
            dtTest.Rows.Add(dr);

            dr = dtTest.NewRow();
            dr["ID"] = 3;
            dr["Name"] = "Samy";
            dr["Salary"] = "1200";
            dtTest.Rows.Add(dr);

            Parallel.ForEach(dtTest.AsEnumerable(), drow =>
            {
                MessageBox.Show("ID " + drow.Field<int>("ID") + " " + drow.Field<string>("Name") + " " + drow.Field<int>("Salary"));
            });

Answer 3

Parallel.ForEach() expects the first argument to be an IEnumerable<> type. DataTable.Rows is not, but you can turn it into one with the AsEnumerable() extension method. Try:

... Parallel.ForEach(dt.AsEnumerable(), drow => ...

Answer 4

DataTable.Rows returns a DataRowCollection which only implements IEnumerable, not IEnumerable<DataRow>. Use the AsEnumerable() extension method on DataTable (from DataTableExtensions) instead:

Parallel.ForEach(dt.AsEnumerable(), drow =>
{
    ...
    Do Stuff
    ...
});

Answer 5

This is better than the accepted answer because this does not need to reference System.Data.DataSetExtensions:

 Parallel.ForEach(dt.Rows.Cast<DataRow>(), dr =>

To use ForEach with a non-generic collection, you can use the Cast extension method to convert the collection to a generic collection, as shown in this example.