Khi chạy Microsoft Visual , ta sẽ có các giao diện tương đối khác nhau tùy theo phiên bản Microsoft Visual được cài trong máy vi tính. Do đó, ta cần uyển chuyển khi lập trình với các phiên bản khác nhau của Microsoft Visual . Vấn đề ở đây là lập trình những gì ta muốn chứ không cần phải theo sát từng chỉ thị trình bày trong khóa học này. Học để hiểu, không học để bắt chước | Chapter 2 Special Field Name Description Record Number An internal sequential record number assigned to all records returned to the report Page Number Page number Group Number An internal sequential number assigned to all groups Total Page Count The total page count Report Title The report title as saved in the report file s Summary Information Report Comments The comments entered in the Summary Information Record Selection Formula The Record Selection Formula used by the report Group Selection Formula The group selection formula used by the report File Path and Name The full path and filename of the report file File Author The author of the report from the report file s Summary Information File Creation Date The date the report file was created Page N of M Where N is the current page and M is the total page count Summary Fields Earlier in the chapter we looked at creating a report using the Standard Expert. One of the tabs in the expert was for Total where a summary field could be inserted into your report. Summary fields are usually associated with groups or a grand total in your report and can be inserted into your report by right-clicking anywhere within the Report Designer and selecting Insert Summary from the menu that appears. This opens the dialog shown in Figure 2-27. At this point you may also notice that the right-click menu includes an option for Subtotal subtotals and summary fields are similar but a subtotal refers specifically to a sum whereas a summary field could be a sum an average or a standard deviation. Formula Fields Crystal Reports .NET features a rich formula language that has evolved over the years as a powerful way to add complex calculations to reports. Formula fields appear in curly braces and are prefixed by the @ symbol a formula used within another formula would look like this @SalesTax @InvoiceTotal Formula fields are created using the integrated Formula Editor. To see the editor right-click Formula Fields in the Field Explorer .
