Skip to main content

Working with combos in NRapid

I think that working with combos is the most complex thing that you can do with NRapid, they are hard to configure and requires a lot of plumbing code, but they are really handy when you have to work with fixed sets of options.

This time I’m going to build a report that shows some employees info. The report’s dialog will allows us to filter that info based on the employees city and get smaller result sets. Cities are a fixed set of data(at least in Northwind) so combos will be a nice choice.
In order to get a combo, we need to add to properties to the nested dialog. Those properties will work together to make selection works.

The code may look something like this:

Notice that City is annotated with the ViewIgnore attribute, this is the way to tell to engine "do not create a control for this property". And Cities is annotated with the DispalyOptionsFor attribute pointing to City, this means that the selected option in the combo will be used to set the value of the City property.

Now that we have those properties hooked up, we need to populate the list with the fixed set of options. I usually do this in the dialog constructor.
Something important to know is that when we’re getting the selected City from the combo options, we’ve to ask for the Cities property (and not for the one that we use to store the selection)

When you execute the report you will get a dialog like this:

And then when you confirm the dialog you will get the employees info filtered by city.(In this case London)

So that's it for combos. In the next post I’ll show you how to work with autocompletes.

You can get the source code of NRapid from here
And the sample app from here
The Northwind database is available from download at


Popular posts from this blog

Migrating an ASP.NET MVC 4 app from Azure websites to WinHost

About a week ago I've to migrate an ASP.NET MVC 4/EF5 application from Azure websites to WinHost. While the process was really smooth, there were some caveats related to database connections that I want to share with you. Create and setup the ftp profile on VS and configure the connection string was really easy, WinHost provide you those values and there is nothing special here. But once you deploy your website and try to see it online, you may get the “yellow screen of dead” with the message: "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)" Assuming you wrote the connection string properly, this happens because you cannot use the default connection name in your web.c

How to show excel files inside the .NET Webbrowser Control

If you are reading this, chances are you been banging your head against the wall for a couple of hours (or even days) trying to show excel files inside the WinForms webbrowser control. Possible reasons you ended up in here: You had working code that got broke after upgrading from Win 7. Your code doesn’t work the same way between machines running different (newer) versions of IE. A download box pops up every time your app tries to show an excel file inside the webbrowser control (you wanna show the actual content). You just have no clue on how to get excel working into the .NET embedded webbrowser control. You are trying to implement IInternetSecurityManager and don’t know where to start. (Or how don’t know how to delegate calls to your security manager). Among many other, maybe….. Yes, COM is a PITA, so is ActiveX and IE (Embedded or full for that matter). And no, showing excel files inside the webbrowser control shouldn’t be that hard, but sometimes we have

Moving to Medium

It's been a long time since I want to give medium a try, and finally, I made some time to do it. To get started on the new platform, I'll be doing series on "Getting programming concepts, languages and tools". If it sounds interesting to you, please take a look at the first post  Getting AWK  and spread the word if you like it. I'm not going to migrate old entries to the new web site. They will remain here safe and sound! As usual, thanks for reading!