I search everywhere and didn`t find anwser for this question. I want to group by intervals (DateTime, Numeric) in Dynamic linq (the data will be crated dynamically so i must use dynamic linq)
Lets assume that we have such data:
ID|Date|Price
1|2010-11-01|100
2|2010-11-01|120
3|2010-11-02|50
4|2010-12-01|30
5|2010-12-01|220
6|2011-01-01|400
How to get this data grouped by like this
-(Group by Day) following groups
->2010-11-01 = 2 elements
->2010-11-02 = 1 elements
->2010-12-01 = 2 elements
->2011-01-01 = 1 elements
-(Group by Month) following groups
->2010-11 = 3 elements
->2010-12 = 2 elements
->2011-01 = 1 elements
-(Group by Quarter) following groups
->2010 q.03 = 5 elements
->2011 q.01 = 1 elements
-(Group by Year) following groups
->2010 = 5 elements
->2011 = 1 element
-(Group by Price (From 0, Each 50)) following groups
-> <0-50) = 1 elements
-> <50-100) = 1 elements
-> <100-150) = 2 elements
-> <200-250) = 1 elements
-> <400-450) = 1 elements
-(ideally it would be Group by Price (From 0-50,From 50-150, From 150-500)) following groups
-> <0-50) = 1 elements
-> <50-150) = 3 elements
-> <150-500) = 2 elements
Any Ideas? I stress again - it must be DYNAMIC LINQ or eventually some sophisticated lambda expression? I should been able to "group" it by column name that will be in string. e.g.
GroupBy("Date"), GroupBy("Price");
Here's how to do it:
For instance:
Group by Month
public Item[] data =
{
new Item { Date = new DateTime(2011, 11, 6), Price = 103, Name = "a" },
new Item { Date = new DateTime(2011, 11, 16), Price = 110, Name = "b" },
new Item { Date = new DateTime(2011, 12, 4), Price = 200, Name = "c" },
new Item { Date = new DateTime(2011, 12, 4), Price = 230, Name = "d" },
new Item { Date = new DateTime(2012, 1, 15), Price = 117, Name = "e" }
};
var groups = data.AsQueryable().GroupBy("Date.Month", "it").Cast<IGrouping<int, Item>>();
You can use "Date.Day" and "Date.Year" and for something like a price range you could use a function which maps everything in the range onto the same value e.g. using integer division "(it.Price / 50)"