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The SpreadsheetControl provides the capability to sort data by text (alphabetically, according to the current culture), numbers, dates and times in one column. The end-user can select a range in one column and on the Data tab, in the Sort & Filter group, click Sort A to Z for ascending order or click Sort Z to A for descending order.
If multiple columns are selected, the range is sorted by the first column.
The Spreadsheet API provides a Worksheet.Sort method, which allows sorting in ascending or descending order in the same manner as the sort commands available to the end-user. However, the 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 by multiple columns, perform the following steps.
- 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 System.Collections.Generic.IComparer<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.
workbook.LoadDocument("Documents\\Sortsample.xlsx"); Worksheet worksheet = workbook.Worksheets; // 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);