Rows effectively returns IEnumerable (DataRowCollection), so the compiler can only pick object as the type for var. Use Rows.Cast<DataRow> if you want to use var. Cast is defined on Enumerable, so you have to include System.Linq.
You need to specify which column of the datarow you want to pull data from. Try the following: StringBuilder output = new StringBuilder(); foreach (DataRow rows in results.Tables[0].Rows) { foreach (DataColumn col in results.Tables[0].Columns) { output.AppendFormat(“{0} “, rows[col]); } output.AppendLine(); }
Check if the data column is not null with DataRow.IsNull(string columnName) if (!row.IsNull(“Int64_id”)) { // here you can use it safety long someValue = (long)row[“Int64_id”]; } There are overloads for it using the index of the column or if you have the instance of the DataColumn. If you are sure about the index, use the … Read more
You use the NewRow to create a row with the same columns. To actually get it into the DataTable, you’ve got to do myDataTable.Rows.InsertAt(myDataRow, 0); Where 0 is the index you want to insert it at.
Safest way – use for loop for (int i = datatable.Rows.Count – 1; i >= 0; i–) { if (true) { datatable.Rows[i].Delete(); } } Don’t forget to AcceptChanges to remove all marked rows: datatable.AcceptChanges();
DataRow’s are nice in the way that they have their underlying table linked to them. With the underlying table you can verify that a specific row has a specific column in it. If DataRow.Table.Columns.Contains(“column”) Then MsgBox(“YAY”) End If
You can try with this code – based on Rows.Add method DataTable table = new DataTable(); DataRow row = table.NewRow(); table.Rows.Add(row); Reference: https://learn.microsoft.com/dotnet/api/system.data.datarowcollection.add?view=net-5.0#System_Data_DataRowCollection_Add_System_Data_DataRow_
Make a string criteria to search for, like this: string searchExpression = “ID = 5” Then use the .Select() method of the DataTable object, like this: DataRow[] foundRows = YourDataTable.Select(searchExpression); Now you can loop through the results, like this: int numberOfCalls; bool result; foreach(DataRow dr in foundRows) { // Get value of Calls here result … Read more
You can use DataColumn.Ordinal to get the index of the column in the DataTable. So if you need the next column as mentioned use Column.Ordinal + 1: row[row.Table.Columns[“ColumnName”].Ordinal + 1] = someOtherValue; Warning: This code returns the next column, so the one after ColumnName, as requested in the question.
DataRow[] rows = dt.Select(); Assuming you still have access to the datatable.