LINQ 面试题与答案
问题 1. What is LINQ?
Language-Integrated Query (LINQ) is a set of features in C# and VB.NET that allows you to write queries directly into your code.
Example:
var query = from x in myList where x > 5 select x;
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问题 2. 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.
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问题 3. What is deferred execution in LINQ?
Deferred execution means that the execution of the query is delayed until the result is actually enumerated or a terminal operation is called.
Example:
var query = myList.Where(x => x > 5); // Execution is deferred until the result is enumerated.
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问题 4. Explain the concept of anonymous types in LINQ.
Anonymous types allow you to create objects without defining a formal class structure. They are often used in LINQ queries to return a subset of properties.
Example:
var result = from p in products select new { p.Name, p.Price };
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问题 5. 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.
Example:
var query = from x in myList let y = x * 2 select y;
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