Question

I cannot get a PagedDataSource to use an IEnumerated collection of EntityCollection objects as a datasource.

The PagedDataSource accepts the collection as a datasource but then I can’t use basic properties like CurrentPageIndex and IsLastPage etc.

My application breaks with the error Cannot compute Count for a data source that does not implement ICollection.

I tried doing

ICollection<Location> listlocations = Company.Locations;

but had no success.

What can I do?

Codesnippet

    protected void loadBuildings()
    {
        PagedDataSource pds = new PagedDataSource();
        pds.DataSource = Company.Locations;
        pds.AllowPaging = true;
        pds.PageSize = Convert.ToInt16(ddlPageSize.SelectedValue);
        pds.CurrentPageIndex = CurrentPage;
        lnkbtnNext.Enabled = !pds.IsLastPage;
        lnkbtnPrevious.Enabled = !pds.IsFirstPage;

        buildingsDataList.DataSource = pds;
        buildingsDataList.DataBind();
    }

Answer 1

I had to use the option AllowCustomPaging and define my own pages because EntityCollection doesn’t support the ICollection class.

I added the following code to define my pages/items

    pds.VirtualCount = Company.Locations.Count();
    pds.PageSize = 3;
    pds.AllowCustomPaging = true;

as well as some other code in my pagegeneration method

for (int i = 0; i < (pds.VirtualCount/pds.PageSize);i++)