Skip to main content

WinForms, How to enable sorting for a datagridview that uses linq queries as data source

How to enable sorting for a datagridview that uses linq queries as data source it is a frequently asked question on the web. The short answer is you cannot, but let dig a little deeper.

Why the sorting functionality works as expected when you use it on a grid binded to a DataTable and miserably fails when you bind it to an IEnumerable<DataRow>? 
A bit of research later… Easy, the DataTable class provides its own implementation for sorting rows whereas IEnumrable<T> does not.

I faced this problem building the power grid control, because (to make paging records easy) internally I was using linq queries. As soon as I realized that the datagrid sorting was broken, I started to look on the web an easy way to solve this problem (other than implement my own sorting mechanisms, of course). I found a couple of alternatives but this one convinced me.

This class has a neat way to solve generic sorting with a minimal impact on performance. I’ve tested it sorting pages containing 1K+ records and it’s a breeze.

This is how I use it.

As you can see, instead of binding the query result directly to the datagrid, I'm wrapping it into a SortableBindingList first and then performing data binding.

Finally, the sorting functionality works as expected ;)

You can get the code from here


Popular posts from this blog

How to create MS Word documents from Office templates using C#

The OpenXML SDK allows you to do pretty much anything you want with office files such as Excel, Word, etc… While many people like this library, I found it complex, unintuitive and poorly documented, not to mention the awful xml format that uses under the hood to represent the documents, styles, etc. So I decided not to use it and build my own solution. If you, like me, don’t like that library, you will find in this post an alternative approach to build word documents from templates using c#. A neat trick to work with Office is to use the macro recorder to understand how things work. The macro recorder allows you to start a macro, do something by hand, stop it, and then take a look at the generated VBA code. Once you do this, you are pretty much set. This is how it looks the template I’am going to use. Note: save the file as a Word template (.dotx) This is the code to create Word documents from C#: By running the code, you should get a document that looks

WinForms, paging the DataGridView the right way

I know this may sound like old history, but in the enterprise world there is still a lot of WinForms development. Just a couple of days ago, I had to implement a custom DataGridView capable to work over a butt load of data (100K+ records) and keep responses times acceptables. I thought paging will be a good way to go, and as WinForms is pretty old nowadays, I supposed it will be easy to find a couple examples on the web. While in fact I found examples, all of them were incompletes and/or they wouldn't perform well in real world apps... So I decided to roll my own component and post it online. Hopefully, someone else will find it useful ;). The bread and butter of this solution relies on LINQ and deferred execution. As LINQ takes care of all complicated work, it was quite easy to implement. This component also supports conditional format, sorting and some search capabilities, but in this post I will concentrate on paging only (I'll cover the rest of the features in f

Printing html using the embedded web browser control

In this post I’ll try to answer some questions about the web browser control and provide some workarounds for known issues involved in the printing process. I'm assuming that you have some experience with the web browser control and basic knowledge of COM and hosting APIs. So I’m not going to cover those topics. At the bottom of this page I’ve added the links to download a small library I wrote that takes care of printing HTML and a demo app so you can try it out without having to write any code by yourself. Using the code The HtmlPrinter class will allow you to print html from an URL or just passing the html as string, you can also specify the title and the number of copies you want to print. The code may look something like this: Now that we know how to use the API let get answer some questions. Why my app crashes when I try to print multiple copies of a page? Well, apparently when you send a lot of print commands to the web browser control, ther