C# convert sql query into EF dbcontext linq to entities query

Linq Lambda to SQL Sub Query Conversion

A might be useful...let... a declaration to choose the first response for each QuestionID group:...from answer in Answers group answer by answer.QuestionID into question let firstAnswer = question.OrderByDescending(q => q.AnswerID).First() select firstAnswer ...EDIT: The aforementioned query is converted into N+1 database calls via Linq2Sql. One SQ...

In a LINQ to SQL query, convert a datetime to a formatted text.

Using SqlFunctions is an additional option. Your code will look like this: DateName...var offer = (from p in dc.CustomerOffer join q in dc.OffersInBranch on p.ID equals q.OfferID where q.BranchID == singleLoc.LocationID let value = (p.OriginalPrice - p.NewPrice) * 100 / p.Origi...

C# LINQ to Entities query for the intersection of two different properties

I know it's not especially elegant, but how about simplifying your code and going about it this way? I'm not sure (off the top of my head) whether LINQ has a ...nice... method of doing what you want:...IList<Pencil> sameColorPencils = new List<Pencil>(); Pen p = db.Pens.Find(id); foreach (Color color in p.Color) { var pencils = from pencil in...

Convert string to int in an Entity Framework linq query and handling the parsing exception

First method...var numbers = Purchases.Select(x => x.Number).ToList(); int temp; int max = numbers.Select(n => int.TryParse(n, out temp) ? temp : 0).Max(); Console.WriteLine("Max: {0}", max); ...Second method...int temp2; int max2 = Purchases.Select(x => x.Number).ToList().Select(n => int.TryParse(n, out temp2) ? temp2 : 0).Max(); Console.WriteL...

LINQ Query to inner join DbContext Entities to IQueryable

I have two tables with a one-to-many relationship: "Events" and "Services" (each event has at least one service)....I'm creating a C# console application that will extract the services that correlate to a subset of the events....I've got a technique that turns the occurrences into an...IQueryable<Event>... object, and it functions as intended. Howe...

Entity Framework query ToString won't produce SQL query

ZZZ_tmp

C# Entity Framework text SQL query wrapper

This is a similar issue I'm having: ...How may a SQL query of a non-entity type return numerous columns?...I have to use the strategy....string[,] DirectQuery(string sqlText, string[] param)... This essentially acts as SQL Server Management Studio's C# counterpart....A string matrix holding the results of the query should be sent to the user when t...

Convert query from SQL to Entity Framework code first approach

I'm trying to translate my SQL query into Entity Framework code, but I'm having trouble....Here is my SQL command....select * from tests where id in(select testid from PatientTests where PatientId=@id) ...This is a test model, and I want to get records from it....public class Tests { [Key] public int Id { get; set; } [Required] [Di...

Unable to convert SQL query to Entity Framework Core

My SQL query cannot be converted to Entity Framework Core....The SQL command is:...select * from tests join TestParameters on (tests.Id = TestParameters.TestId) join PatientTests on (Tests.Id = PatientTests.TestId) where PatientId = 3 ...These models are displayed:...public class Tests { [Key] public int Id { get; set; } [Required]...

How to convert sql query to entity framework core

I want to translate a SQL query into the core of the entity structure. a SQL query...select * from Departments where id in(select DepartmentId from SubDepartments where id in(select SubDeptId from Tests where id in(select TestId from PatientTests where PatientId=3)))