这里是一个类似的问题，具有很好的答案:

如何在rdlc中创建变量 [ http://forums.asp.net/t/1177290.aspx/1 [ ^ ]

请注意，变量和参数是同一件事.这仅取决于您使用的SQL版本.

Here is a similar question that has a good answer:

how to create variable in rdlc[^]

There is also a good question/answer on ASP.NET that gives you some more information:

http://forums.asp.net/t/1177290.aspx/1[^]

Note that variables and parameters are the same thing. It just depends on which version of SQL you are using.