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EntityDataSource: TotalRowCount returns -1. What's that?

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+3 A:

From http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.entitydatasource.selected(VS.100).aspx:

    The TotalRowCount property of the EntityDataSourceSelectedEventArgs 
object shows the total number of objects in all pages, regardless of the 
values passed by the data-bound control for paging. 

    TotalRowCount is only retrieved if the data-bound 
control needs it, such as if paging is enabled.

Is your data-bound control using paging?

DaveB 2010-03-02 21:35:04

No, it doesn't use paging. OK, thanks, that explains why TotalRowCount is useless without paging. But how can I determine the number of objects then?

Slauma 2010-03-02 22:13:36

Since e.Results is an IEnumerable, how about e.Results.Count() ?

DaveB 2010-03-02 22:55:09

e.Results is an `System.Collections.IEnumerable` which does not seem to have a `Count()` method or property - in contrast to `System.Collections.Generic.IEnumerable<T>`.

Slauma 2010-03-02 23:44:29

Try importing the Linq namespace and using it's extension method.

DaveB 2010-03-03 04:32:50

System.Linq and System.Data.Linq was already imported but it doesn't help. The extension method seems only to be available for the generic version of IEnumerable but not for the non-generic version. After looking at various other discussions here about IEnumerable I think the only way is really to iterate through IEnumerable and to count the objects.

Slauma 2010-03-03 12:58:51

This post may be of some help if you want to write your own extension method. http://stackoverflow.com/questions/1155619/ienumberable-to-something-that-i-can-get-a-count-from

DaveB 2010-03-03 19:52:20

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EntityDataSource: TotalRowCount returns -1. What's that?

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