我有一份包含以下部分的报告：
ReportTitle
ColumnHeader
MasterData
ColumnFooter
ReportSummary
如何在ReportTitle上显示MasterData中字段的总和？
我可以看到两种可能的方式：
通过报表变量：
单独计算总数。
使用报表变量（可能还有TfrxReport.OnGetValue事件）将总数传递给报表。
通过报告的＜code＞DoublePass＜/code＞属性：
将TfrxReport.EngineOptions.DoublePass属性设置为True。
计算报告脚本中的总数，并在第一次传递时将其存储到脚本变量中
根据第二遍的变量填写备忘录。
在脚本中使用Engine.FinalPass来检测它是否是最后一次（第二次）通过。
或者，如果总结是查询的结果，则获取此结果并显示它
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