LINQ stands for Language Integrated Query. It’s a method for querying data used in a .NET platform that is similar to the SQL query. LINQ can query any type of data, be it a set of objects, database or XML files. The unique feature of LINQ is that it makes the code more readable and the same LINQ syntax will work for multiple queries. Because if it’s robustness, LINQ is used in many applications that work with .NET capabilities. Here is the list of most commonly asked questions in LINQ interviews. 1. What is LINQ? LINQ or Language Integrated Query allows us to write queries for local as well as remote data sources such as XML, SQL etc. LINQ will work on any collection class that gears the IEnumerable interface. 2. What do you mean by Query and Sequence operators in LINQ? The sequence is a collection class on which you want to query. An Element is a single item in the collection class and the class must implement the IEnumerable interface. Query operators take in the sequence as input, process it and return the new result sequence. 3. Define Extension Methods. Extension methods are static functions of a static class. These methods can be invoked similar to the syntax of the instance method. These methods are used when a class needn’t be modified. 4. What are Anonymous data types? Anonymous types are types that are generated by the compiler upon runtime. We don’t need to specify a name when we create an anonymous type. Only properties names are created and values assigned to them at runtime. In LINQ, Anonymous types are used to also save intermediate results. However, Anonymous types cannot implement interfaces, specify methods, or define static methods. All defined properties must be initialised and only public fields can be defined. 5. What is an Anonymous function? An Anonymous function is a function without a name. In an Anonymous function, we only define parameters and write the code in curly braces.
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6. Explain Lambda Expression. Lambda expression is a shortcut to writing delegates. Lambda expression is used to write inline functions that can be passed as arguments to a function or returned as arguments from a function. The syntax of a Lambda expression is: We specify the input parameters on the left, the lambda operator in the middle and expression or statement block on the right side. 7. What is meant by Action in LINQ? Action refers to the general delegates belonging to the base class library of .NET. We can store only methods with input parameters and void return types in Action. Upto 16 parameters can be specified. 8. What is a Predicate delegate in LINQ? The Predicate delegate is provided by the base class of the .NET library. In Predicate, we are allowed to store only methods with one input parameter and bool return type. Predicate delegates are useful in scenarios where filtering is needed, say of a list and so on. 9. What is the advantage of LINQ over stored procedures? It is very difficult to debug Stored Procedures but relatively easier to debug LINQ’s queries with Visual Studio’s debugger. For stored procedures, we need to provide an additional script for deployment but with LINQ, deployment easy because all the code gets compiled into one DLL. LINQ is Type Safe. Hence, query errors are checked at compile time. 10. What is the advantage of using LINQ Dataset? We can run strongly typed queries on Datasets by using LINQ. If you want to combine the values of 2 datasets, or extract a unique value from a dataset, LINQ will be useful. With LINQ, you can query a dataset more effectively with more features when compared to ADO. NET. 11. What are LINQ query expressions? A LINQ query expression has a combination of instructions for filtering, sorting, joining or grouping for the source data. LINQ query expression syntax is very similar to the SQL syntax. 12. What is PLINQ? PLINQ is Parallel Language Integrated Query. In PLINQ, a query can be executed using many processors. With PLINQ, Software can be made scalable across environments during execution. Apart from supporting all operators in LINQ, PLINQ also runs many LINQ queries simultaneously as well. 13. What is the difference between the Take and Skip clause? The Take clause is used to return only a specified number of elements. The Skip clause on the other hand, skips a specified number of elements and returns the rest only.
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