防止水晶报表跳过第一行的部分数据

Question

    Using con as sqlconnection=sqlcon() 


     Dim cmd as new sqlcommand("select * from exams", con) 
     Con.open
     Dr=cmd.executereader()
     Dim da as new sqldataadapter(cmd) 
     Dim dt as new datatable("exams" ) 
     Dt. Load(dr) 
     Dgvexam. Datasource=dt
     Dr. Close
     Showgrades() 
     Con. Close() 

     Dim report as new CrystalreportExam
     Report. Setdatasource(dt) 
     Examviewer. Examview.      Reportsource=report
     Examviewer. Show
    End using
End sub

datagridview 正确填充所有行。当水晶报告加载时，第一行仅包含分数，缺少等级。 但从第2行往下就没问题了。数据加载良好。