Performance on ZeroSharp

MiniProfiler with DevExpress XAF

Tue, 27 Aug 2013 09:14:00 +0100

In this post I will demonstrate how to add MiniProfiler to the XAF MainDemo web application.

MiniProfiler is a simple fast profiler with a pretty user interface. It is fast because it only profiles code that you have explicitly decorated with the MiniProfiler.Step() method. It was designed by the team at StackOverflow.

First, add the MiniProfiler NuGet package to the MainDemo.Web project. Then add a placeholder to default.aspx just before the last <body> tag.

A look at the DevExpress MainDemo with Google Page Speed

Wed, 12 Sep 2012 17:22:00 +0100

In this post I’ll demonstrate how to use the Google Page Speed tools to analyse the performance of the DevExpress XAF MainDemo.

The easiest way to run Google Page Speed is as a Chrome or Firefox plugin. Both are available here. I use Chrome.

Now open the DevExpress MainDemo from Visual Studio. By default it is installed to:

C:\Users\Public\Documents\DXperience 12.1 Demos\eXpressApp Framework\MainDemo\CS\MainDemo.sln

Set the MainDemo.Web as the startup project and change the connection string in web.config if necessary. Launch the application with Chrome and login as ‘Sam’ (password is blank). Then press F12 to bring up the developer tools. The last tab is the Page Speed Analysis and your browser should look like this:

XpoBatch source code available

Wed, 25 Jul 2012 16:24:00 +0100

The source code for the fast batch operations with DevExpress XPO is now available on on GitHub.

It includes unit tests that can be run against SQL Server or in memory. It runs against DevExpress 12.1.7, but it will work against 11.2 (and possibly earlier versions) with a couple of minor modifications which are documented in the code.

References

Fast batch modifications with DevExpress XPO

Tue, 24 Jul 2012 14:02:00 +0100

Last week I wrote about fast batch deletions. In this post I’ll show how to do the same for modifications.

Let’s assume we want to replace the ‘State’ property with ‘CA’ and CostCenter with 123 for all records where the ‘City’ is ‘San Francisco’. The recommended DevExpress approach would be something like the following:

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using (UnitOfWork uow = new UnitOfWork())
{	
	var xpCollection = new XPCollection<MyObject>(uow, CriteriaOperator.Parse("City == 'San Francisco'"));
 foreach (MyObject myObject in xpCollection)
 {
 myObject.State = "CA";
 myObject.CostCenter = 123;
 }
 uow.CommitChanges();
}

The problem with the above code is that every record must be loaded and then an individual UPDATE command is generated for each modification. This is necessary for the business logic to be applied correctly (such as the code in methods such as OnSaving()). It is also necessary to handle record locking.

Fast batch deletions with DevExpress XPO

Thu, 12 Jul 2012 17:00:00 +0100

When deleting a collection of objects, DevExpress recommends using Session.Delete(ICollection objects). This has the same effect as calling the Delete() method for every object in the collection so that the business logic is applied correctly. The business logic in this context refers to code such as that in the OnDeleting(), OnDeleted() methods, but it also includes the clearing of references to the object by other objects. This approach is slow, but ensures the integrity of the data.