Different ways to write LINQ query - Dot Net Tricks.

How to write LINQ query? Ask Question Asked 8 years, 4 months ago. Active 8 years, 4 months ago. Viewed 2k times 3. 1. Above you can see FollowingUsers and StatusUpdates tables. In FollowingUsers, I store Follower's Username and Following's Username. In StatusUpdates, I store Status updates of users. Below you can see original query I wrote to retrieve status updates of user who logged in. var.

Different Ways to Write LINQ Query with Examples. In this article, I am going to discuss the Different Ways to write LINQ Query with examples. Please read our previous article where we discussed the Architecture of LINQ i.e. how LINQ works. In this article, we are going to discuss the following pointers.

Part 2 Writing LINQ Queries - YouTube.

There are 2 types of LINQ Syntax, which you need to learn: Query Syntax; Method Syntax; Query Syntax. Query Syntax is easy to learn. It has SQL like query syntax but it does not support all query operators in LINQ. Method Syntax is the more powerful way to write LINQ queries and it is also a standard way to write LINQ syntax. Define.LINQ query can be execute in multiple ways, here we used foreach loop to execute our query stored in myLinqQuery. The foreach loop executes the query on the data source and get the result and then iterates over the result set. Thus, every LINQ query must query to some kind of data sources whether it can be array, collections, XML or other.To write the LINQ Query, we need the following three things: Data Source (in-memory objects, SQL, XML) Query; Execution of the Query; What is a Query? A query is nothing but a set of instructions. Queries are applied to the data source (i.e., in-memory object, SQL, XML, etc.) to perform the operations (i.e., CRUD operations) and show the shape of the output from that Query. This means that the.


The purpose here is to get a collection with all the possible combinations from 2 sources. With query-syntax, the code is simple and self-explanatory.The method-syntax, on the other hand, requires a head-scratching to understand. To understand how both ways work to give the same result, you can use the OzCode VS extension’s LINQ feature:. OrderBy with multiple orderings.It's exactly how you would write it in SQL as well. There is a nice way to do this by creating a Data Transfer Object (DTO) as a class that represents something similar to your Data Model with only the properties you want to pass around. This DTO can take a constructor parameter of your Data Model and map it to your DTOs properties. THEN, you can use Select to select out your DTO from your.

Linq allows the developer to write query expressions in his own choice of programming language with out having the necessity to learn different databases and query languages. Linq defines a set of standard query operators to perform SQL operations over the different data sources. LINQ Architecture. Linq architecture is extensible. Linq includes extensions that provides querying capabilities.

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LINQ Concepts - Query syntax. There are two different syntax paradigms for accessing LINQ functionality: query syntax and method syntax. Query syntax has a very distinctive syntactical style. Due to its unique format, query syntax is very memorable and somewhat iconic as it's often what people envision when thinking of LINQ. Here is an example of LINQ code using query syntax: Query syntax.

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In short, LINQ to Objects offers a fresh approach to collections as earlier, it was vital to write long coding (foreach loops of much complexity) for retrieval of data from a collection which is now replaced by writing declarative code which clearly describes the desired data that is required to retrieve. There are also many advantages of LINQ to Objects over traditional foreach loops like.

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LINQ to Entities is a subset of LINQ which allows us to write queries against the Entity Framework conceptual models. Entity SQL. Entity SQL is a query language designed to be used with the Entity Framework. The Entity SQL Queries are database independent. EntitySQL looks similar to standard SQL Queries. Native SQL. Native SQL is the database dependent query language. Best Entity Framework.

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LINQ to DB is the fastest LINQ database access library offering a simple, light, fast, and type-safe layer between your POCO objects and your database. Architecturally it is one step above micro-ORMs like Dapper, Massive, or PetaPoco, in that you work with LINQ expressions, not with magic strings, while maintaining a thin abstraction layer between your code and the database. Your queries are.

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There is a limitation of what you can write in a DLINQ query. This is clear, because DLINQ queries are translated at runtime to T-SQL statements, so the possibilities of DLINQ queries are limited by the T-SQL language. Conversion to T-SQL supports many of standard language constructs, but it can hardly support calling of your methods for two reasons. First (more important) reason is that the.

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