Crystal Report查看器只显示IE中的行;将数据导出为PDF

I've created a very simple report just to test the way to connect to it with ASP.net. It appears to be loading the report and pulling the report data from the database without any problems, but what is displayed is just a bunch of vertical lines. If I choose to export to PDF, etc., via the toolbar, however, that appears fine. Checking the source code of the page also reveals that the data is present there.I've created a very simple report just to test