What Do You Know About LINQ?

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| By Jaksiboy

Jaksiboy

Community Contributor

Quizzes Created: 832 | Total Attempts: 12,139,660

Questions: 10 | Attempts: 623 | Updated: Mar 21, 2023

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LINQ is a Microsoft. NET Framework component. It adds data query capabilities to existing. NET languages. It can also be used to extract and process data from arrays, XML documents and third-party data sources. Find out how much you know about this. NET Framework component by taking this quiz.

Questions and Answers

1.

What does the acronym LINQ stand for?
- A.
  
  List Integration Query
- B.
  
  Language-Integrated Query
- C.
  
  Linked-List Inner Query
- D.
  
  Linked-Integrated Query
Correct Answer
B. Language-Integrated Query

Explanation
The acronym LINQ stands for Language-Integrated Query. LINQ is a feature in Microsoft .NET programming languages that allows developers to query and manipulate data from different data sources using a unified syntax. It provides a consistent way to query and transform data in a language-integrated manner, making it easier for developers to work with data regardless of its source or format.

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2.

Which syntax does LINQ support?
- A.
  
  C# and F#
- B.
  
  C++ and C
- C.
  
  C# and VB
- D.
  
  Java and C++
Correct Answer
C. C# and VB

Explanation
LINQ (Language Integrated Query) is a feature in .NET that allows querying data from different data sources using a unified syntax. It is primarily supported in C# and VB (Visual Basic) programming languages. Both C# and VB have built-in support for LINQ, providing developers with a powerful tool for querying and manipulating data in a concise and readable manner. Therefore, the correct answer is C# and VB.

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3.

Which of the following type of syntax does LINQ support?
- A.
  
  Method syntax
- B.
  
  Query syntax
- C.
  
  A and B
- D.
  
  None of the above
Correct Answer
C. A and B

Explanation
LINQ supports both method syntax and query syntax. Method syntax allows writing LINQ queries using extension methods, while query syntax allows writing LINQ queries using a SQL-like syntax. Both syntaxes provide flexibility and ease of use for querying data in LINQ. Therefore, the correct answer is A and B.

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4.

What is an Expression tree?
- A.
  
  Tree of expression in C# or VB
- B.
  
  Binary tree like data structure for better LINQ support
- C.
  
  In-memory representation of lambda expression
- D.
  
  Executable tree structure
Correct Answer
C. In-memory representation of lambda expression

Explanation
An expression tree is a data structure in C# or VB that represents a lambda expression in memory. It allows the lambda expression to be manipulated and analyzed at runtime. This data structure is used to store and evaluate the lambda expression, making it possible to dynamically execute code.

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5.

Which interface must third-party data providers implement in other to support LINQ?
- A.
  
  IQueryable
- B.
  
  IEnumerable
- C.
  
  ICollection
- D.
  
  ICollector
Correct Answer
A. IQueryable

Explanation
Third-party data providers must implement the IQueryable interface in order to support LINQ. IQueryable allows for the creation and execution of queryable expressions against a specific data source. It provides functionality for querying data in a flexible and efficient manner, allowing LINQ to translate queries into the appropriate language or syntax for the underlying data source. By implementing the IQueryable interface, third-party data providers can enable LINQ to query their data and provide a seamless integration with LINQ-enabled applications.

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6.

Which of the following supports LINQ?
- A.
  
  XML Document
- B.
  
  Entity Framework
- C.
  
  Object collection
- D.
  
  All of the above
Correct Answer
D. All of the above

Explanation
All of the options mentioned in the question support LINQ. LINQ (Language Integrated Query) is a feature in .NET that allows developers to query and manipulate data from different data sources using a unified syntax. XML Document, Entity Framework, and Object collection are all examples of data sources that can be queried using LINQ. Therefore, the correct answer is "All of the above."

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7.

Which of the following standard query operator returns the common elements from two collections?
- A.
  
  Except
- B.
  
  Intersect
- C.
  
  Union
- D.
  
  Distinct
Correct Answer
B. Intersect

Explanation
The Intersect operator is used to return the common elements from two collections. It compares the elements of both collections and only returns the elements that are present in both collections. This operator is useful when you want to find the intersection or overlap between two sets of data.

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8.

Which of the following operators executes LINQ query immediately and gets the result?
- A.
  
  Casting operators
- B.
  
  Joining operators
- C.
  
  ‘To’ operators
- D.
  
  Grouping operators
Correct Answer
C. ‘To’ operators

Explanation
The correct answer is 'To' operators. 'To' operators in LINQ, such as ToList(), ToArray(), and ToDictionary(), execute the LINQ query immediately and return the result as a specific type of collection. These operators convert the query results into a list, array, or dictionary, allowing for further manipulation or retrieval of data.

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9.

In what is OrderByDecending NOT supported?
- A.
  
  Method syntax
- B.
  
  VB Method syntax
- C.
  
  Lambda expression
- D.
  
  Query syntax
Correct Answer
D. Query syntax

Explanation
OrderByDescending is not supported in the query syntax. The query syntax is a declarative syntax that allows you to write queries in a SQL-like manner, whereas OrderByDescending is a method that is used in method syntax and lambda expressions to sort a collection in descending order. Therefore, if you are using the query syntax, you cannot use OrderByDescending to sort the collection.

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10.

Which of the following is TRUE?
- A.
  
  An expression compiles into assembly code
- B.
  
  An Expression compiles into expression tree
- C.
  
  An Expression compiles into machine code
- D.
  
  An Expression compiles into executable code
Correct Answer
B. An Expression compiles into expression tree

Explanation
When an expression is compiled, it is transformed into an expression tree. An expression tree is a data structure that represents the structure and semantics of an expression. It is a hierarchical representation of the expression, where each node represents an operator or operand. This allows the compiler to analyze and optimize the expression before generating the final machine code or executable. Therefore, the statement "An Expression compiles into expression tree" is true.

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