Dynamically creating complex metrics (PIVOT) table from code behind using multiple tables, Linq to Sql, GridView

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I've spent significant amount of time looking around, however couldn't really find any solution to this:

I've got 4 tables: Category(id,Name),Product(id,Name,CategoryID),RatedProducts(id,Rating,ProductID,UserID), User(id,Name)

C++

              Category1                        Category2
Name  |   Product1  Product2  Product3    Product4   Product5   Product6
---------------------------------- ----------------------------------
Joe   |  Excellent   Good   Not Rated     Good       Good     Excellent
Jill  |    Good      Poor      Good       Poor       Poor       Good

Mind that product list changes over time as well as ratings and users, so it should all be dynamically populated. GridView must be updatable, user should be able to update Rating by changing the value in a dropdown.

I would prefer LINQ to SQL but any other way is ok.

Posted 20-Mar-12 7:46am

Member 7851700

Updated 20-Mar-12 8:15am

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Herman<T>.Instance · Answer 1 · 2012-03-20T10:59:00

Solution 1

my article about dynamic pivotting explains[^] it all.

Posted 20-Mar-12 10:59am

Herman<T>.Instance

Member 7851700 · Answer 2 · 2012-03-21T01:00:00

Thanks,

C#

var result = from r in smdt.SM_RatedProducts
                   group r by new { r.SM_Product.Name, UserName = r.SM_User.Name, Category = r.SM_Product.SM_Category.Name, r.Rating } into prodGroup
                   orderby prodGroup.Key.UserName ascending
                   orderby prodGroup.Key.Category ascending
                   select new { prodGroup.Key.UserName, prodGroup.Key.Category, prodGroup.Key.Name, prodGroup.Key.Rating };

Mine one should not be as complicated though.

Anyone could give me a tiny hint on how to achieve above?