Rank 1
How do I use the grid filter expresssion in an entity framework query in the NeedDataSource method?
For example after selecting from the grid column filters the filter expression is:
(iif(Comment == null, "", Comment).ToString().ToUpper().Contains("test".ToUpper())) AND (iif(OrderNo == null, "", OrderNo).ToString().ToUpper().StartsWith("830".ToUpper()))How do I use it in my EF query
var orders = db.Orders.Where(o=>o.Status == 2);Thanks.
3 Answers, 1 is accepted
You should let the RadGrid handle the data-binding logic:
http://demos.telerik.com/aspnet-ajax/grid/examples/data-editing/automatic-crud-operations/defaultcs.aspx
Performing complex grid operations such as Inserting, Deleting, Updating, Hierarchy relations, Grouping, Exporting, Paging, Sorting, Filtering, etc. require accommodating appropriate database operations. Therefore, we suggest you to avoid Simple Databinding and strongly recommend the use of more advanced databinding methods, which automatically handle the aforementioned functions:
Declarative DataSource (DataSourceID property)
Programmatic Data Binding (NeedDataSource event, + DetailTableDataBind for hierarchy). You should set the DataSource property ONLY within these event handler.
Regards,
Eyup
Telerik
Rank 1
[quote]Eyup said:
In your case passing the raw database within the NeedDataSource event should be enough. RadGrid will apply the filter and sorting expressions accordingly and extract the necessary items automatically.
[/quote]
But, if the filtering and sorting is left to the RadGrid, doesn't that mean that every record will need to be retrieved from that database and into in memory so that RadGrid can page, filter and sort them.
You are right and this is exactly how the RadGrid operations work. There is no possibility to apply load on demand for the RadGrid data.
Regards,
Maria Ilieva
Telerik