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[Solved] Using DomainDataSource with RadGridView

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BlogReader asked on 05 Nov 2009, 11:38 AM

I am creating a DomainDataSource and binding its Data property to a RadGridView.ItemSource and of course it only gives me one page.

I dont want to use a DataPager control and instead I would like to use the ScrollBar to scroll through the data and once I hit a page boundary to load the next page.

I have worked over 30 hours on this so far and no luck.

Problems I ran into:

1. if the page size is smaller than the displayable area the scroll bar wont show up. What is the easiest way to make sure the scrollbar is always visible?
This is what I am doing now:

var scrollbars = _Grid.ChildrenOfType<ScrollBar>();
var verticalScrollBar = scrollbars.Where(bar => bar.Orientation == Orientation.Vertical).First();

verticalScrollbar

.Visibility = Visibility.Visible;

2. If I set the ScrollBar's Maximum property to the Size of the TotalNumber of records it doesn't seem to make any difference. The scrollbar is still almost as large as the viewing area: (TotalDataCount comes from the Loaded event e.TotalEntityCount)

var scrollbars = _Grid.ChildrenOfType<ScrollBar>();

var scrollBar = scrollbars.Where(bar => bar.Orientation == Orientation.Vertical).First();

scrollbar

.Maximum = TotalDataCount;

scrollbar.Minimum = 1;

scrollbar.SmallChange = 1;

scrollbar.Value = 1;

In my testcase I have 49 records and I set the PageSize to 20 and the LoadSize to 40. So the Minimum is 1 and the Maximum is 49 yet the scroll bar thumb still takes up to 98% (approx) of the scrollbar area.

3. How do I tell the DomainDataSource to go ahead and load the next page? I was using an Internal DataPager (Not displayed in the UI)
void verticalScrollBar_Scroll(object sender, ScrollEventArgs e)

{

if (DataPager.PageIndex != (int)e.NewValue)

{

DataPager.PageIndex = (int)e.NewValue;

}

But once I did go the the next page it only showed 9 items and would not show the previous page. The DomainDataSource seems to think that that is the complete amount of data.

I really would like to do something simialr to the Telerik demo "Server page, sort and filter" and use a DomainDataSource and still use the built in scrollbar (I like the ScrollPositionIndicatorTemplate).

[Solved] Using DomainDataSource with RadGridView

3 Answers, 1 is accepted