Use multiple ReportItems in one expression in RDLC Report

问题

I want to display page wise sum of 2 columns in footer.for that I am using following expression in footer

=Sum(ReportItems!col1.Value) + Sum(ReportItems!col2.Value)

but it gives following error

"The Value expression for the textrun refers to more than one report item. An expression in a page header or footer can refer to only one report item."

anybody knows how can I solve this issue and display page wise sum in footer ?

Thanks

回答1:

Here is simple workaround for your problem:

1. Add single textbox to the body of the report and name it i.e. "SUM"
2. Add your expression to this textbox =ReportItems!col1.Value + ReportItems!col2.Value
3. For this textbox set visibility as hidden
4. In the footer refer to this hidden textbox using =ReportItems!SUM.Value

回答2:

I usually use Custom code-feature of report for these operations. Just open Report Properties and choose Code-view. Just then write basic VB get/set-methods to save and sum values. Referring to methods in TextBox expression goes just like this: =Code.[YourMethodNameHere]. For example, saving value:

=Code.SaveMyValue(Fields!MyVal.Value)

and getting value:

=Code.GetMyValue()

来源：https://stackoverflow.com/questions/20898506/use-multiple-reportitems-in-one-expression-in-rdlc-report