Skip to main content

How to add footers to NRapid reports

Grouping data it's really cool feature, that help us out to provide some sort of data visualization enhancement, it makes the report easy on the eyes and allows to the users  to figure out what’s going on without going into much detail. But usually, that it’s not enough, along with grouping, we'll also need to provide some additional info, such as the day takes, month takes, etc, etc… to complement the grouping functionality and make the report really useful.

This time I going to work with products and categories, I’m going to build a report to show units in stock for each product on each category in our database and add a footer to show the units per category (this is the sum of the units per product for a given category).

In a previous post I’ve shown you how to create reports and group data, so I’ll going to skip those steps here and concentrate in the footer section.
The code you will see below must be place inside the configure report method (also covered in previous posts)

Basically we’re telling to the report engine to go on each category change and execute the specified method, whatever the method returns, it’s going to go into the report right before the next category group.

As we can do with links, it’s also possible to specify callbacks for grouping functions. Those callbacks will be invoked automatically by the report engine at the appropriate time and we will be able to handle that event, so to speak.

The code may look something like this:

* It’s also possible to work with an in-memory data table instead of go a lot of times to the database, but for the sake of simplicity I’m going to leave the code just like that.

When you execute the report, you should get something like this:


You can get the source code of NRapid from here
And the sample app from here
The Northwind database is available from download at http://www.microsoft.com/en-us/download/details.aspx?id=23654

Comments

Popular posts from this blog

How to create MS Word documents from Office templates using C#

The OpenXML SDK allows you to do pretty much anything you want with office files such as Excel, Word, etc… While many people like this library, I found it complex, unintuitive and poorly documented, not to mention the awful xml format that uses under the hood to represent the documents, styles, etc. So I decided not to use it and build my own solution. If you, like me, don’t like that library, you will find in this post an alternative approach to build word documents from templates using c#. A neat trick to work with Office is to use the macro recorder to understand how things work. The macro recorder allows you to start a macro, do something by hand, stop it, and then take a look at the generated VBA code. Once you do this, you are pretty much set. This is how it looks the template I’am going to use. Note: save the file as a Word template (.dotx) This is the code to create Word documents from C#: By running the code, you should get a document that looks...

Printing html using the embedded web browser control

In this post I’ll try to answer some questions about the web browser control and provide some workarounds for known issues involved in the printing process. I'm assuming that you have some experience with the web browser control and basic knowledge of COM and hosting APIs. So I’m not going to cover those topics. At the bottom of this page I’ve added the links to download a small library I wrote that takes care of printing HTML and a demo app so you can try it out without having to write any code by yourself. Using the code The HtmlPrinter class will allow you to print html from an URL or just passing the html as string, you can also specify the title and the number of copies you want to print. The code may look something like this: Now that we know how to use the API let get answer some questions. Why my app crashes when I try to print multiple copies of a page? Well, apparently when you send a lot of print commands to the web browser control, ther...

How to replace text with images on Word documents using C#

This post it’s a reply to a question I got from a previous post that shows how to work with Word templates from C# code . If you haven’t read it, I recommend to do so because I’m not going into details here. But basically it was about how to create a Word document from a template and perform same text manipulation. So, the question from Marcel Kieboom  was “Do you know if it would be also possible to replace one of the words with an image which is locally stored?” The answer is yes, and this is how you can do that. Based on the same convention I had used in the previous post, I should have a template like this: What I’m trying to do here is replace the text [angus-young] for an actual pic of Angus. The technique I’m using it’s pretty common on web sites and basically consist in have an image with a matching name for each keyword I want to replace and then create the image path dynamically. This is the C# code to do that. * When I execute t...