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Paging of large Database Table

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Peter
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Peter asked on 10 May 2017, 10:09 AM

Hi,

I use Entity Framework (Database first) and want display a table with millions of data in a paged Radgridview.

It is not possible to load all data local with

dbContext.MyTable.Load();
radGridView1.DataSource = dbContext.MyTable.Local.ToBindingList();

Is there an example, which also support sorting and filtering  of the Radgridview?

Thank you,

Peter

 

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Dess | Tech Support Engineer, Principal
Telerik team
answered on 10 May 2017, 10:41 AM
Hello Peter, 

Thank you for writing.  
 
According to the provided information, I would recommend you to use RadVirtualGrid which is a grid component developed on top of Telerik Presentation Framework which provides a convenient way to implement your own data management operations and optimizes the performance when interacting with large amounts of data. Additional information is available in the following help articles:
http://docs.telerik.com/devtools/winforms/virtualgrid/overview
http://docs.telerik.com/devtools/winforms/virtualgrid/sorting/sorting
http://docs.telerik.com/devtools/winforms/virtualgrid/paging/paging-overview
http://docs.telerik.com/devtools/winforms/virtualgrid/filtering/filtering

I hope this information helps. Should you have further questions I would be glad to help.

Regards,
Dess
Telerik by Progress
Try our brand new, jQuery-free Angular 2 components built from ground-up which deliver the business app essential building blocks - a grid component, data visualization (charts) and form elements.
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Peter
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answered on 10 May 2017, 12:40 PM

Hi Dess,

thank you. The hint for RadVirtualGrid is good and also the help articles.

But in the examples the whole data is read inside Selectdate (filtered and sorted) in data chache.
At start is no filter is applied and millions of datarows can not read.

Exist also support or example for paging read from Entity framwork?

Regards,
Peter

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Dess | Tech Support Engineer, Principal
Telerik team
answered on 12 May 2017, 09:59 AM
Hello Peter, 

Thank you for writing back. 

The example fills the whole data in a dummy object just for simplicity. However, you can select only the first 100 records for example and when you scroll to the bottom, to extract the next 100. This is the possible approach for loading data in portions in RadVirtualGrid. Please refer to our Demo application >> VirtualGrid >> Web Service example which demonstrates a sample approach. The Demo application can be found in the installation folder of the suite.

I hope this information helps. If you have any additional questions, please let me know. 

Regards,
Dess
Telerik by Progress
Try our brand new, jQuery-free Angular 2 components built from ground-up which deliver the business app essential building blocks - a grid component, data visualization (charts) and form elements.
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Aseman
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answered on 01 Jan 2020, 10:42 AM

Hello dear Dess

Would  you please do me a favor?

Please Give Me A sample Project Of VirtualGrid with Filtering -Sorting -Paging in WinForm.

I`m waiting for your answer.

Thank you

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Dess | Tech Support Engineer, Principal
Telerik team
answered on 03 Jan 2020, 10:54 AM
Hello, Aseman,     

After installing the Telerik UI for WinForms suite, you can run the Demo application which is located in the installation folder of the suite (C:\Program Files (x86)\Progress\Telerik UI for WinForms R3 2019\Examples\QuickStart\Bin). It offers a great diversity of examples in both, C# and VB.NET. The Demo application >> VirtualGrid >> First Look example will show you how to handle the RadVirtualGrid.SortChanged event and implement sorting behavior. There are several example about filtering and paging as well.

In addition to the above mentioned complete examples, I would recommend you to have a look at the previously referred help articles which will explain in details how the sorting, filtering and paging works in RadVirtualGrid:
http://docs.telerik.com/devtools/winforms/virtualgrid/sorting/sorting 
http://docs.telerik.com/devtools/winforms/virtualgrid/paging/paging-overview 
http://docs.telerik.com/devtools/winforms/virtualgrid/filtering/filtering 

I hope this information helps.

 

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik

Get quickly onboarded and successful with your Telerik and/or Kendo UI products with the Virtual Classroom free technical training, available to all active customers. Learn More.
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Aseman
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answered on 04 Jan 2020, 04:44 PM
Hello Dess 
in Your Examles for filtering or sorting or  even PAGING, In One Time the  Whole Data is Recieved From Database.
it is not ServerSide  filtering or ServerSide   sorting or  ServerSide   PAGING at all.
when i programmatically wrote codes for ServerSide filtering or ServerSide sorting or  ServerSide  PAGING  ,
the rad Virtual Grid  just Show "Page Count = 1" and also " buttonCount =1"  As I said in Rad Grid View Some Dayes ago.
it drives me crazy....:(
You told me Use rad Virtual Gridview .its serverside Operations But I can not See it...
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Dess | Tech Support Engineer, Principal
Telerik team
answered on 07 Jan 2020, 08:30 AM

Hello, Aseman,   

RadVirtualGrid doesn't provide any integrated server-side operations. Consider it as a container control with cells. When scrolling it (vertical or horizontal), the values only for the visible cells are required and you need to specify the requested value. 

RadVirtualGrid provides a convenient public API for populating its cells with data by using the CellValueNeeded event. When a cell value is required, the CellValueNeeded event is fired. Considering the demanded RowIndex/ColumnIndex you can extract the respective value from your external data source. 

It doesn't matter whether it is a DataTable, a service, a table from the data base, a collection of custom objects. RadVirtualGrid just needs the VirtualGridCellValueNeededEventArgs.Value property to be set. It is up to you to extract the relevant data and it is not quite related to RadVirtualGrid and how to query the data from the server. RadVirtualGrid just provides the public API for filling the data on demand but the data-operations has to be performed outside the grid itself.

Should you have further questions please let me know.

Regards,
Dess | Tech Support Engineer, Sr.
Progress Telerik

Get quickly onboarded and successful with your Telerik and/or Kendo UI products with the Virtual Classroom free technical training, available to all active customers. Learn More.
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Dess | Tech Support Engineer, Principal
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Peter
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