Intermediate / 1 to 5 years experienced level questions
Intermediate / 1 to 5 years experienced level questions & answers
Ques 1. Explain the difference between IEnumerable and IQueryable in LINQ.
IEnumerable is used for querying data from in-memory collections, while IQueryable is used for querying data from out-of-memory data sources like a database.
Ques 2. What is the purpose of the 'let' keyword in LINQ?
The 'let' keyword allows you to create a new variable within a query and use it within the rest of the query.
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Ques 3. Explain the usage of 'group by' in LINQ.
'Group by' is used to group elements based on a specific key. It is often used in conjunction with aggregate functions like Count, Sum, etc.
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Ques 4. Explain the use of 'join' in LINQ.
'Join' is used to combine elements from two or more collections based on a related key.
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Ques 5. What is the purpose of the 'SingleOrDefault' method in LINQ?
'SingleOrDefault' returns the only element of a sequence or a default value if the sequence is empty. It throws an exception if there is more than one element.
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Ques 6. Explain the concept of 'query syntax' and 'method syntax' in LINQ.
'Query syntax' is the SQL-like syntax used in LINQ queries, while 'method syntax' involves using extension methods and lambda expressions to achieve the same results.
Example:
Method Syntax: var result = myList.Where(x => x > 5);
Ques 7. Explain the concept of 'deferred loading' in LINQ to SQL.
'Deferred loading' in LINQ to SQL means that related objects are not loaded from the database until they are accessed for the first time.
Ques 8. Explain the usage of the 'Skip' and 'Take' methods in LINQ.
'Skip' is used to skip a specified number of elements in a sequence, and 'Take' is used to return a specified number of elements from the start of a sequence.
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Ques 9. Explain the concept of 'immediate execution' in LINQ.
'Immediate execution' means that the query is executed and the results are retrieved immediately when the query is defined.
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Ques 10. What is the purpose of the 'Zip' method in LINQ?
'Zip' is used to merge two sequences element-wise, creating a new sequence of pairs based on the elements at the same index.
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Ques 11. Explain the use of 'AsEnumerable' in LINQ.
'AsEnumerable' is used to cast a sequence to its enumerable form, which can be useful in scenarios where you want to force the query to be executed on the client side rather than on the server side.
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