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Currently I have SQL query like select tt.userId, count(tt.userId) from (SELECT userId,COUNT(userId) as cou FROM dbo.users where createdTime DATEADD(wk,-1,GETDATE) group by userId,DATEPART(minute,createdTime)/5) tt group by tt.userId Now I have the Data in the Data Table, I need to convert the above the query to LINQ and execute against the data table. I am unable to do so, can anybody help me out. This is what query does, It groups the users into 5 minutes time slots and then counts the number of timeslots per user. Note: I am not able to use Linqer to create the Linq queries because this table does not exist in the database, it's a virtual one created dynamically.
LINQ is an excellent way for querying different data sources using C#.With LINQ queries we can query different data sources such as XML.Instead of using different querying languages such as XPath or SQL,we can use C# regardless of the type of data source. When using LINQ we need to be aware of just the LINQ query operators such as Select,Where. LINQ queries can only be used with data sources which implements the IEnumerable interface.This is a requirement for the data source to be queried using the linq queries.Most of the collections in.NET implements this interface,so we can query most of the collections using linq. Since ado.net datatable doesn’t implement this interface hence we can not use linq queries for querying the datatable directly. If we try to access linq extension methods on the datatable directly,we will see that there are no extension methods available for the datatable. To query datatable using linq we call the AsEnumerable method of the DataTable.Calling this method on the DataTable returns an object which implements the IEnumerable interface.Now we can perform LINQ queries on this object. To use this method we need to do the following.
Add a reference to the System.Data.DataSetExtensions.This is usually added by default. Add the namespace System.Linq After adding the above namespace if we call the AsEnumerable method on the datatable,we are able to access LINQ extension methods on the datatable In the following example we are creating a table having id and product as columns.These columns represents the id and product.We are adding different rows to the datatable having different id and product values. Now we can perform the normal linq queries on the datatable.For example to search for a product with id 2 we can use the following linq query.