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Group Sorting in gridview

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Perlom
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Perlom asked on 29 Apr 2012, 07:19 PM
Hi,

I have Gridview that is abound to a collection of object “Benefit”, which has an Amount (decimal) that I would like to group on it is value. I have ranges with a text value that returns the corresponding range for that amount

Less than 100
100 – 250
250 – 500
Greater than 500

When I apply a group descriptor, the grouping occurs on these text vales, but it is sorted alphabetically. How can control the sorting of the group itself? I can convert that Range property to return integer value, but I still want to display the group text as above. I tried the Generic Group Descriptor <TElement, TKey, TSortKey> but didn’t help.

How can resolve this?

Cheers

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Dimitrina
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answered on 30 Apr 2012, 08:55 AM
Hi,

 Have you checked this forum thread? Why using the Generic Group Descriptor <TElement, TKey, TSortKey> didn’t help ?

Kind regards,
Didie
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Perlom
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answered on 30 Apr 2012, 05:58 PM
Hi Didie,

Thank you for the reply. I actually have seen that thread, and I tried to follow it. However, Group Descriptor <TElement, TKey, TSortKey> resulted in groups of 1 element only, and the desiplayed name in the group panel was the Class long name (with name space).

Below is the code, I have property ApprovalRange which is string for the group name, and another property ApprovalSortRange which is an integer that I want to sort the group on (1 to 4). The colu,mn itself is amount which is decimal.

var disc = new GroupDescriptor<BenefitApprovalModelItem, BenefitApprovalModelItem, int> 
        { 
                GroupingExpression = item => item, 
                GroupSortingExpression = grouping => grouping.Key.ApprovalRangeSort, 
                DisplayContent = "ApprovalRange", 
                SortDirection = ListSortDirection.Ascending 
        };
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Dimitrina
Telerik team
answered on 01 May 2012, 02:45 PM
Hello,

 You can override the ToString() method for the BenefitApprovalModelItem item to return the value that you want to appear in the group row. 

Greetings,
Didie
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Perlom
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answered on 01 May 2012, 04:08 PM
Hi Didie,

That won’t help since the grouping itself is not right. This method resulted in all groups having 1 row only each!!! Is there anything wrong with the way I using that descriptor?
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Dimitrina
Telerik team
answered on 01 May 2012, 04:40 PM
Hello,

 Indeed, it is like so. This is the expected behaviour though as you group by the entire item: GroupingExpression = item => item. You have to group on a property of the BenefitApprovalModelItem and set the type of the property as second type when the GroupDescriptor is defined. 

All the best,
Didie
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