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Data Transformation

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GridView
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StevenDale
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StevenDale asked on 16 Nov 2009, 05:52 PM
I have the following scenario: (NOTE: this is just a simplified example of my data schema)

I have a list of Orders. Each Order has a list of OrderDetails. Each OrderDetail has a type. I want to display a grid that shows for each order each OrderDetail.Type as a column.

So you have what would look like this: (Keep in mind that there are other detailtypes that are not used e.g. Type 2, 4, 5 and that new detailtypes can be created)
Order1
     -> Detail1.Type = "Type 1"   Detail1.Value = "Value for Detail 1 Type 1"
     -> Detail2.Type = "Type 3"   Detail2.Value = "Value for Detail 2 Type 3"
     -> Detail3.Type = "Type 6"   Detail3.Value = "Value for Detail 3 Type 6"
Order2
     -> Detail1.Type = "Type 1"   Detail1.Value = "Value for Detail 1 Type 1"
     -> Detail2.Type = "Type 6"   Detail2.Value = "Value for Detail 2 Type 6"
Order 3
     -> Detail1.Type = "Type 3"   Detail1.Value = "Value for Detail 1 Type 3"


I want to show a column for each detail type used in any orderdetail for any order. Also, there is no fixed list of these types because new orderdetail types can be added. So basically I am showing my orderDetail values horizontally instead of vertically and I create a column for each detailtype that exists in any orderdetail of an order even though some orders will not necessarily have a orderdetail with one of the types.
NOTE: A type can only be in one orderdetail per order.

And my resulting Grid should look like this:

Order  |                 Type 1                 |                 Type 3                 |                 Type 6                 |
   1           Value for Detail 1 Type 1         Value for Detail 2 Type 3           Value for Detail 3 Type 6
   2           Value for Detail 1 Type 1                                                        Value for Detail 2 Type 6
   3                                                        Value for Detail 1 Type 3


I have gone so far as creating a Dictionary of <Order, OrderDetail> and placed null in the OrderDetail value if it does not have a value for a type but I cannot figure out how to display this in a grid without programatically creating the grid.

Any ideas would be appreciated.

Thanks,

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Pavel Pavlov
Telerik team
answered on 19 Nov 2009, 02:26 PM
Hi Billy ,

Since no predefined count of columns or column mappings exist I would recommend the following approach :

Dynamically create and  populate a DataTable from your data and leave RadGridView to autogenerate its columns.
RadGridView for WPF  has a good support for working with DataTables and this will keep the solution simple while giving the 'dynamic' option of building columns.

Kind regards,
Pavel Pavlov
the Telerik team

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