Skip to main content

LINQ, Reserved Names and .Net

Here's another good reason not to use reserved names.

I'm working on a LINQ project with a series of tables that manage user roles. As a result, I have table names like Systems, Roles and Users.
My trouble started when I would add the objects to the Designer, hit Save and then suddenly Visual Studio would say things like

"System.Data.Linq.Mapping.DatabaseAttribute is not defined"
or
"System.Nullable is not defined"


In short, stopping me dead in my tracks. Now that I look back, I don't know why I didn't see the reason earlier.

When using the Object Relational Designer, Visual Studio wants to be smart and changes any words that are plural to singular so they make more sense when dealing with data.


That way, your code looks like

oUser = New User
oUser.UserName = "John"

instead of
oUser = New Users
etc

This is really nice because it does make the code a little more legible except in this situation:

Plural (singular)
Users (User)
Roles (Role)
UserRoles (UserRole)
Systems (System)


See the gotcha? Visual Studio translated the "Systems" table into a "System" object which immediately negated all of the main namespaces in the project.

The renaming feature for the objects in LINQ-to-SQL is great - but be warned, when you start getting errors like this, take a look at your source tables.

Comments

Popular posts from this blog

Blogs and RSS come to Microsoft.com

MS has just introduced their portal and it's pretty comprehensive. Nothing quite like learning that some people use AIM instead of MSN messenger, or that there really may be a need for supporting 4 monitors ( Cyrus Complains ) However, it's really a great sign that MS is serious about supporting the blogging community which seems to have um, exploded in size in the past year. Blogs and RSS come to Microsoft.com

FoxInCloud Stats

FoxInCloud sent this link a while back about their statistics regarding visits to their site: http://foxincloud.com/blog/2017/12/27/VFP-community-lessons-from-foxincloud-site.html What's interesting here is the breakdown of people. Yes, I think it's understandable that the Fox community is getting older. Another factor is the growth of the mobile and web environments taking over development. These environments really do push people towards the newer non-SQL or free SQL/hosted environments but more towards hosted storage options like Amazon and Google. A tool like FoxInCloud that helps MOVE existing applications to the cloud inherently competes with those environments. But FoxInCloud also allows developers to extend their application further by giving them a starting point using Javascript and the basic CSS (such as Bootstrap). If you're not rebuilding your application from scratch, it's certainly a great step forward. FoxPro VFP

Facebook Revolt - imeem alternatives?

When Scoble noted how Facebook under major revolt , I immediately thought of a site I found yesterday. The value offered by Facebook's feeds however do seem very cool - if only they had been smart and made them opt-in, instead of opt-out. I have been impressed though with Facebook's opening of their API's - they certainly get it that they need to open it up to developers. I haven't really explored this other site, beyond my first look. In some ways, I think the whole social networking site thing is just silly , but this site (imeem) definitely showed some value. I could find music (as posted by the artist), it worked in Firefox and it allowed people to rank, add to delicious and more. And when I'm looking at someone, I can see what they're up to (or rather what they allow us to see). Anyways, you may want to check it out.