Tim Mackey's Weblog
.Net Windows Forms
Monday, 30 April 2007
LINQ: upgrading May CTP projects to Orcas Beta 1
here are a few of my main findings/hurdles encountered when upgrading May CTP web projects to Orcas beta 1 Web Application Projects. I'm targeting version 3.5 of the framework for deployment on a Server 2003 with .Net 2.0 runtime installed, i will update this article if it doesn't work out.
if you had any code in the "App_Code" folder, VS will probably have set the compile action to "content", it should be changed to "compile". otherwise you will get errors like:
The type or namespace name 'xyz' could not be found (are you missing a using directive or an assembly reference?)
you'll have to remove any reference to the System.Query and System.Expressions, these are not part of the new LINQ spec.
Replace System.Data.DLinq with System.Data.Linq.
if you want to use any LINQ expressions, like
"from x in db.Table select x"
then you need to include the System.Linq namespace. otherwise you will get errors like '
System.Data.Linq.Table<xyz>' does not contain a definition for 'Where' and no extension method 'Where' accepting a first argument of type 'System.Data.Linq.Table<xyz>' could be found (are you missing a using directive or an assembly reference?)
you will also need to include System.Linq.Expressions if you are using "language-level code expressions to be represented as objects in the form of expression trees".
The old LINQ assemblies are versioned 1.0.2319.19044 (May CTP) but the new ones for Beta 1 are versioned 188.8.131.52. Have a check through the referenced assemblies in your project to make sure you have the latest versions.
look out for the new crystal report assemblies, 10.5.3700.0. a web app referencing the new versions in web.config will complain if these versions are not available on the server. i'll update soon when i have found out how to do this.
Monday, 30 April 2007 11:50:28 (GMT Daylight Time, UTC+01:00)
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