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语法:Join(<数组>, <分隔符>)
说明:连接指定数组的元素或集合的成员,在每个元素或成员之间使用指定的分隔符。
示例:{Join(@MultiValueParameter, ", ")}
比如我们希望将多选下拉列表中勾选的内容显示在报表中,如下图所示,就需要用到Join函数。因为此时报表参数是一个多值参数的数组,直接使用会显示为“System.Object[]”,不能获取到数组中的具体值。
我们使用Join函数将数组转换为字符串才可以将具体的值显示出来。
接下来为您接介绍的操作过程。
1. 参考多选下拉列表示例,制作一个多值参数的下拉列表。
2. 添加页眉。
3. 将报表参数拖拽到页眉区域,并调整文本框大小以及居中方式。
4. 将表达式调整为: {Join(@Type, ",")}-销售明细表 。
表达式解析:、表达式中Join 函数将参数获取到的数组用逗号拼接为字符串,这样才可以显示出来。后边的“-销售明细表”为拼接的固定字符串,直接显示。
5. 预览报表,查看效果。报表页眉会根据勾选的查询条件来动态的显示参数值。