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IIF 函数是最常用的流程函数，根据第一个参数的结果逻辑值（真/假），返回第二个或第三个参数的值。
报表中许多行为控制都是通过IIF函数来实现的：
报表外观的条件格式化中用到的表达式为 {IIF(订单金额 > 1000, "Green", "White")} ，实现了当订单金额大于1000时，文本框背景会自动显示为绿色的效果。
效果如下图所示，详情请参见条件格式化。
在IsNothing函数示例中用到的表达式为 {IIF(IsNothing(@p1), "未输入参数值", @p1)} ，实现了如果未输入参数，报表内容则显示“未输入参数值”；如果输入了参数，报表内容则显示出参数值的效果。
详情请参见IsNothing函数示例。