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How to log your LINQ query

, 24 Oct 2011 CPOL
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Log your LINQ query
Most of the beginner developers who are using LINQ to SQL as their back-end to talk with the database (i.e., to perform the database CRUD operation), don't have an idea what query gets fired to database out of LINQ query.

Lastly, I asked to log the query that fires to database out of my LINQ query. So as a solution, I found one make use of SQL Server Profiler to check fire query. But with the profiler, I am not able to log the queries.

I found one solution is to make use of Log property of DataContext object. Log property allows me to log the queries in the file. Consider the below code:

//created temp file 
(System.IO.StreamWriter sw = new System.IO.StreamWriter(@"e:\tempdatacontext.log"))
    EmployeeDataContext edb = new EmployeeDataContext();
    //assigned streamwriter to the log property of datacontext
    edb.Log = sw;
    var cust = from c in edb.Customers
              join d in edb.Distributors on
                new { CityID = c.CityId, StateID = c.StateId, 
                      CountryID = c.CountryId, Id = c.DistributorId }
                new { CityID = d.CityId, StateID = d.StateId, 
                      CountryID = d.CountryId, Id = d.DistributorId }
              select c;

    List<customer> custList = cust.ToList();

So once the code gets executed, it's time to check the temp file. As I opened up the file, I found the following query gets fired on my database.

It's fun to find the query gets fired to database and you get to know if there is any problem in the LINQ query you wrote.

Reference from Linq and C#.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Pranay Rana
Software Developer (Senior) GMind Solusion
India India

Microsoft C# MVP (12-13)

Hey, I am Pranay Rana, working as a ITA in MNC. Web development in Asp.Net with C# and MS sql server are the experience tools that I have had for the past 5.5 years now.

For me def. of programming is : Programming is something that you do once and that get used by multiple for many years

You can visit my blog

StackOverFlow -
My CV :-


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GeneralFYI, I recommend deleting this tip/trick and making it an al... Pin
AspDotNetDev21-Oct-11 13:15
protectorAspDotNetDev21-Oct-11 13:15 

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