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To sort data in a range in ascending or descending order, use the Worksheet.Sort method. Note that this method has several overloads with serious advantages. You can specify the column by which to sort a multi-column range, sort by multiple columns, or use a custom comparer.
To sort data by multiple columns, follow the steps below.
- Create the SortField object for each of the columns from which to sort. Specify the position of this column within the range using the SortField.ColumnOffset property and assign a comparer using the SortField.Comparer property. Instead of implementing your own comparer with the IComparer<T><CellValue,> interface, you can use one of the built-in comparers which are responsible for sort operations performed by end-users. There are two built-in comparers - Worksheet.Comparers.Ascending is used for sorting in ascending order; Worksheet.Comparers.Descending is used for sorting in descending order.
- Create a list containing sort fields.
- Call the Worksheet.Sort method with two parameters: the first is the CellRange to be sorted, the other is the list of sort fields.
Worksheet worksheet = workbook.Worksheets["SortSample"]; workbook.Worksheets.ActiveWorksheet = worksheet; // Create sorting fields. List<SortField> fields = new List<SortField>(); // First sorting field. First column (offset = 0) will be sorted using ascending order. SortField sortField1 = new SortField(); sortField1.ColumnOffset = 0; sortField1.Comparer = worksheet.Comparers.Ascending; fields.Add(sortField1); // Second sorting field. Second column (offset = 1) will be sorted using ascending order. SortField sortField2 = new SortField(); sortField2.ColumnOffset = 1; sortField2.Comparer = worksheet.Comparers.Ascending; fields.Add(sortField2); // Sort the range by sorting fields. CellRange range = worksheet.Range["A3:F22"]; worksheet.Sort(range, fields);
The image below shows the result (the workbook is opened in Microsoft® Excel®). The cell range is sorted by the first and second columns in ascending order.