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[Solved] How does Server Binding work and accessing Command object

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Akzhol The Kyrgyz asked on 08 May 2010, 03:29 PM

How does server binding work? I need general overview of the process in order solve my problems and not to bother telerik support every time.

                    url?complicated-filtering-sorting-paging-paramters        

When I click for example page 5:

1 - Telerik handles all url parameters before user defined ActionMethod is called and store it somewhere. (Is it so? If it is doing so, how can access command object?)

2 - Let the user defined Action Method to run and give data model (usually IQueryable)

3 - Use previously stored command data (filtering, sorting, page) to render actual HTML.

Is above process flow true?

I need this info to solve my problems. For instance one problem to solve is exporting to excel:

I'm implementing a generic export action method in BaseController [which is base to all my controllers], that has following pseudo code. [Every Controller implements getObjectList()]

                    public ActionResult Export(string[] columns, string[] titles, string fileName)         
                IQuerable data = getObjectList();         
                Construct Excel Document Using Reflection and column names.         
                return Excel.         

The problem with this code is that it exports all the data, but I want it to export data after applying filter and orderby (no need for page and groupby).

So I want to add following line of code:

                    IEnumerable real_data = data.ToGridModel(page, data.count(), orderBy, "", filter);         

Where can access orderBy and filter?

Thanks in advance.

6 Answers, 1 is accepted

answered on 10 May 2010, 08:54 AM

Hi, Atanas

Thanks very much for your quick answer.

Yes I know that Custom Binding is probable solution to this problem, but not the effective one. Because If I could access "command"using server binding and from any controller then I would solve my problem in baseController. However if I use Custom Binding I've to modify around 30-50 grids/controllers which is error prone and will result in other design issues. Also I've my own ToolBox which makes some assumptions, so changing to Custom Binding will cause some problems there too.

So how about my assumption about how telerik-grid works in server binding? Is it correct?

I need general process flow to speed up my custom solution to this problem.

Thanks in advance.

answered on 10 May 2010, 08:59 AM

Hi Akzhol The Kyrgyz,

The grid command object will be accessible if you decorate your action method with the [GridAction] attribute. However there is a known issue with proper population of the GridCommand and server binding - you can find a hotfix build attached here.

Generally speaking the grid is using the query string arguments to process the provided data (page, sort etc) unless custom binding is enabled.

Regards,
Atanas Korchev
the Telerik team

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answered on 10 May 2010, 09:35 AM

[quote]

Generally speaking the grid is using the query string arguments to process the provided data (page, sort etc) unless custom binding is enabled.

[/quote]

This what I want: I want to parse command from query string arguments. Since this is already done in Telerik Grid, I want to use its functionality. Assume any point in any controller, I still have QueryString in my Request, so I can use it.

In telerik-grid it can be done in this way

                                    GridActionBindingContext context = new GridActionBindingContext(EnableCustomBinding, filterContext.Controller, model.Data, model.Total);         
                            GridDataProcessor dataProcessor = new GridDataProcessor(context);         
                    IQuerably very_wanted_data = dataProcessor.ProcessedDataSource         
                     

But what can supply instead of "filterContext.Controller", I'm having problem at this step.?

The above link provides a binary, but I need source code, to apply some other fixes that I get through forums here.

Moreover I want to contribute something to this community and implement generic export to excel & print, that's not dependent on some assumptions. Solving above would be enable also doing so.

Thanks.

answered on 10 May 2010, 09:45 AM

Hello Akzhol The Kyrgyz,

We have decided not to attach the source code of such internal hotfixes. What are the fixes you need to apply manually? We are incorporating all fixes in our code so this build should have all reported and officially recognized bugs fixed.

The GridCommand has a Parse method built in. You just need to pass the required values (extract them from query string).

We have published a knowledge base article showing how to perform excel export. You can download the code and check it out.

Regards,
Atanas Korchev
the Telerik team