LINQ is .NET Language-Integrated Query. It's included in .NET Framework 3.5 and you can use it in Visual Studio 2008 projects. XPO has officially supported LINQ since v7.3 and since then we have continued to improve and support it. Nowadays LINQ to XPO is very mature, extendable (How to: Implement Custom Functions and Criteria in LINQ to XPO) and ...

At 11.00 PST on Thursday 15th December I will be appearing live on Scott Hanselman’s podcast Hanselminutes. During the course of the show Scott and I will be discussing eXpand framework and its relationship with XAF. Please tune in and show some support for your favorite frameworks! We built this thing together guys and this is an exciting event ...

WF4 uses a service oriented architecture and as a result any problem can be decoupled into smaller, easily solvable and testable services. XAF uses MVC architecture which, in a sense, is very similar to that used by WF4. We can compare XAF’s controllers to WF4 services. Moreover XAF’s Application does the same job as the WF4 server. The upshot of ...

Prerequisites Part 1 In this post we are going to enhance the State Machine module UI. Remember that along with all the usual XAF goodies we can now use Xpand code base which gives us a lot more options. Our StateMachineTransitionPermission has 2 lookups, StateMachineName and StateMachine. Our goal is to populate both of these cascading ...

As promised in the previous post I will now attempt to provide a concise yet comprehensive look at the 5 possibilities that Xpand gives us when we want to create a calculated member. I will also provide discussion of the relative advantages and disadvantages of each approach. We can see all of them in action in Xpand FeatureCenter application. ...

Recently in Xpand forums Dionisis Soldatos raised a question about how unbound columns can be implemented with XAF. Unbound columns along with their UnboundExpression can be used for creating calculated fields even at runtime. Since we are talking about unbound grid columns it should be obvious that we will operate at the UI level by modifying the ...

In version 11.1.7 our team now provides workflow instance support outside XAF borders! With a few lines of code, it is now possible to store our workflows in any of the 14 database systems described in this post. Durability is a key benefit of the Workflow Foundation and it is based on the ability to store a running workflow instance on the fly ...

In this post we are going to extend the functionality of the workflow module. to create a UI that will help us to schedule workflows. Some of you may recall that we looked at using a Delay inside a While activity in Working with CRUD activities – Short Transactions. Recently, DX-Squad member Martin Praxmarer raised an interesting question relating ...

Our profiler uses WCF in order to communicate with the client application. One of the benefits of the XPOProfiler is that it supports 2 binding types. Both binding types have their advantages however in this situation only one allows us the flexibility we require. NetTcpBinding This option provides a secure and reliable binding environment for ...

The .NET Framework 4 ships with the SQL Workflow Instance Store which allows workflows to persist state information about workflow instances in a SQL Server 2005 or SQL Server 2008 database. However its implementation is based on stored procedures which can be a bit scary if you are not familiar with them. In addition our customers may follow ...

Let me describe for a moment how we at DX work. We build and sell software which means that we only sell and provide support for products that have been built and tested by us! However I am here as a framework evangelist and huge XAF fan. This makes it my duty to spread the word as much as I can and make XAF even bigger. To this end through ...

Prerequisites Manually starting workflows In the first post of the series we saw how to start a workflow using a WCF service. Furthermore we also discussed doing this using the module’s out of the box mechanisms. So far however, we haven’t had time to analyze the reasons for choosing one method or the other. This post aims to clarify the ...