LINQ Interview Questions and Answers
Here you can find LINQ Interview Questions and Answers.
Why LINQ Interview Questions and Answers Required?
In this LINQ Interview Questions and Answers section you can learn and practice LINQ Interview Questions and Answers to improve your skills in order to face technical
inerview by IT companies. By Practicing these interview questions, you can easily crack any LINQ interview.
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You no need to worry, we have given lots of LINQ Interview Questions and Answers and also we have provided lots of FAQ's to quickly answer the questions in the
LINQ technical interview.
LINQ Interview Questions and Answers
What is LINQ?
It stands for Language Integrated Query.
LINQ is collection of standard query operators that provides the query facilities into .NET framework language like C# , VB.NET.
LINQ Interview Questions and Answers
Why can not datareader by returned from a Web Services Method?
Because, it is not serializable
LINQ Interview Questions and Answers
What is the extension of the file, when LINQ to SQL is used?
The extension of the file is .dbml
LINQ Interview Questions and Answers
How LINQ is beneficial than Stored Procedures?
There are couple of advantage of LINQ over stored procedures.
1. Debugging - It is really very hard to debug the Stored procedure but as LINQ is part of .NET, you can use visual studio's debugger to debug the queries.
2. Deployment - With stored procedures, we need to provide an additional script for stored procedures but with LINQ everything gets complied into single DLL hence
deployment becomes easy.
3. Type Safety - LINQ is type safe, so queries errors are type checked at compile time. It is really good to encounter an error when compiling rather than runtime exception!
LINQ Interview Questions and Answers
What is a Lambda expression?
A Lambda expression is nothing but an Anonymous Function, can contain expressions and statements. Lambda expressions can be used mostly to create delegates or
expression tree types. Lambda expression uses lambda operator => and read as 'goes to' operator.
Left side of this operator specifies the input parameters and contains the expression or statement block at the right side.
Example: myExp = myExp/10;
Now, let see how we can assign the above to a delegate and create an expression tree:
delegate int myDel(int intMyNum);
static void Main(string[] args)
{
//assign lambda expression to a delegate:
myDel myDelegate = myExp => myExp / 10;
int intRes = myDelegate(110);
Console.WriteLine("Output {0}", intRes);
Console.ReadLine();
//Create an expression tree type
//This needs System.Linq.Expressions
Expression myExpDel = myExp => myExp /10;}
LINQ Interview Questions and Answers
Why Select clause comes after from clause in LINQ?
The reason is, LINQ is used with C# or other programming languages, which requires all the variables to be declared first.
From clause of LINQ query just defines the range or conditions to select records.
So that’s why from clause must appear before Select in LINQ.
LINQ Interview Questions and Answers
Difference between LINQ and Stored Procedures?
There are couple of advantage of LINQ over stored procedures.
1. Debugging - It is really very hard to debug the Stored procedure but as LINQ is part of .NET, you can use visual studio's debugger to debug the queries.
2. Deployment - With stored procedures, we need to provide an additional script for stored procedures but with LINQ everything gets complied into single DLL hence
deployment becomes easy.
3. Type Safety - LINQ is type safe, so queries errors are type checked at compile time. It is really good to encounter an error when compiling rather than runtime exception!
4. PreCompiled - Stored Procedures are precompiled, and LINQ queries need to compile before execution. So stored procedures are fast in performance.
LINQ Interview Questions and Answers
What are Benefits and Advantages of LINQ?
Benefits and Advantages of LINQ are:
1. Makes it easier to transform data into objects.
2. A common syntax for all data.
3. Strongly typed code.
4. Provider integration.
5. Reduction in work.
6. Performance in the general case doesn't become an issue.
7. Built-in security.
8. LINQ is declarative.
LINQ Interview Questions and Answers
What are the three main components of LINQ or Language INtegrated Query?
1. Standard Query Operators
2. Language Extensions
3. LINQ Providers
LINQ Interview Questions and Answers
How are Standard Query Operators implemented in LINQ?
Standard Query Operators are implemented as extension methods in .NET Framework.
These Standard Query Operators can be used to work with any collection of objects that implements the IEnumerable interface.
A class that inherits from the IEnumerable < t > interface must provide an enumerator for iterating over a collection of a specific type.
All arrays implement IEnumerable < t >.
Also, most of the generic collection classes implement IEnumerable < t > interface.
