The Simple Answer to the WebGrid sorting issue - LINQ to Entities only supports casting EDM primitive or enumeration types

-
Spent so much time on this error, examining my models, data structure etc. What it boiled down to was the sortability of the IEnumerable object on the page vs a sortable list. All you need to do most of the time is to recast it in your controller like this:

 var retdata = bl.GetPidHistory(pid);
 var itemstoreturn = retdata.ToList();
 return View(itemstoreturn);

 This is applicable when your view has a model like this: @model IEnumerable

Comments

Post a Comment

Popular posts from this blog

Linq Exclude from separate list

-
 var urlList = new List<DisplayAssets>();    var assetsToExclude = (from a in db.DisplayAssets                 join h in db.Hardware_Assets on a.id equals h.displayId                 where h.assetId == hardwareid                 select a.id); var allAssets = db.DisplayAssets; var urls = allAssets.Where(x => !assetsToExclude.Contains(x.id));         urlList = urls.Select(a => new DisplayAssets()         {             locaterAddress  = a.locaterAddress,             assetType = a.assetType,             id = a.id         })         .ToList();
Read more

Sorting Ascending and Descending

-
Toggling the direction of your datagrid sort is easy using a session to remember which direction you sorted last.   You will want to declare an empty string in the top of your page       Dim SortField As String Then on your sort command add this logic - Example of entire command Private Sub dgTaskExceptions_SortCommand( ByVal source As Object , ByVal e As System.Web.UI.WebControls.DataGridSortCommandEventArgs) Handles dgTaskExceptions.SortCommand     SortField = e.SortExpression If Session( "toggle" ) = True Then SortField += " DESC" Session( "toggle" ) = False Else SortField += " Asc" Session( "toggle" ) = True End If Dim orderstring As String = SortField 'REBIND dgTaskExceptions.DataSource = POTracking_Data.tracking.getSampleTasks(orderstring) dgTaskExceptions.DataBind() End Sub   In my datalayer I add this logic to my query and pass in an OPTIONAL value Dim orderbyString As String = String .Empt
Read more

Linq Query Syntax vs Method Syntax

-
Referenced from MSDN: https://msdn.microsoft.com/en-us/library/bb397947.aspx Query syntax: IEnumerable<int> numQuery1 =               from num in numbers             where num % 2 == 0             orderby num             select num; Method syntax:         IEnumerable<int> numQuery2 = numbers.Where(num => num % 2 == 0).OrderBy(n => n)
Read more