C# LINQ Methods Quiz: Anonymous Types and More

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Questions and Answers

Which method is used to remove an element at a specific index from a List object?

Insert

RemoveAt (correct)

Remove

Add

What method is used to remove the first occurrence of a specific object from a List object?

RemoveAt

Insert

Remove (correct)

Indexing

In the context of List objects, what does the Count property return?

Number of elements currently in the List (correct)

Final index of the List

Size of the List

Capacity of the List

Which method is used to insert an element into a List at a specified index?

Insert Signup and view all the answers

When declaring a new List, what does the placeholder T represent?

Type of objects stored in the list Signup and view all the answers

Which property indicates the number of items a List can hold without needing to grow?

Capacity Signup and view all the answers

What does the Add method do in a List?

Appends its argument to the end of the List Signup and view all the answers

In a List, what does the Insert method require as its first argument?

Index at which to insert the value Signup and view all the answers

How can Lists be indexed?

By placing the index in square brackets after the List variable's name Signup and view all the answers

What does the Remove method do in a List?

Removes the first instance of an element with a specific value Signup and view all the answers

What does the RemoveAt method do in a List?

Removes an element at a specified index Signup and view all the answers

What happens to the indices of elements when a new element is inserted in a List?

They increase by one for elements before the insertion point Signup and view all the answers

What does the Distinct extension method do?

Removes duplicate elements from the collection Signup and view all the answers

In LINQ, what does the select clause do?

Generates a new object of anonymous type based on specified properties Signup and view all the answers

What is the purpose of specifying a different name for a property inside an anonymous type definition?

To change the property name in the result of the query Signup and view all the answers

How are implicitly typed local variables related to using anonymous types?

They allow using anonymous types without explicitly stating the type Signup and view all the answers

What is an example of a projection in LINQ?

Creating new objects with specified properties Signup and view all the answers

How can a programmer give all employees a 10% raise using LINQ?

By multiplying employees' MonthlySalary properties by 1.1 Signup and view all the answers

Study Notes

List Object Methods

The RemoveAt method is used to remove an element at a specific index from a List object.
The Remove method is used to remove the first occurrence of a specific object from a List object.

List Object Properties

The Count property returns the number of elements in a List object.
The Capacity property indicates the number of items a List can hold without needing to grow.

Inserting Elements

The Insert method is used to insert an element into a List at a specified index.
The Insert method requires the index as its first argument.

Declaring a New List

When declaring a new List, the placeholder T represents the type of elements the List will hold.

Modifying a List

The Add method adds an element to the end of a List.
When a new element is inserted in a List, the indices of elements after the insertion point are shifted upwards.

Removing Elements

The Remove method removes the first occurrence of a specific object from a List object.
The RemoveAt method removes the element at a specific index from a List object.

LINQ

The Distinct extension method returns a sequence that contains no duplicate elements.
The select clause is used to specify the type of values to retrieve or to perform a transformation on retrieved values.
In LINQ, an example of a projection is when you use the select clause to transform or flatten a result set.

Anonymous Types

Specifying a different name for a property inside an anonymous type definition allows the property to be referred to by that name.
Implicitly typed local variables are related to using anonymous types, as they can be used to declare variables that will hold anonymous types.

LINQ Example

A programmer can give all employees a 10% raise using LINQ by using the select clause to transform the employee data, multiplying their salaries by 1.1.

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Description

Learn about the Distinct extension method in LINQ, which removes duplicate elements from a collection. Understand how to create new objects of anonymous type using the select clause in C#. Explore how to specify custom property names for the selected properties.

C# LINQ Methods and Anonymous Types

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