Deck 9: Introduction to Linq and Generic Collections

Question 1

You can sort a LINQ query's results only by one property.

Answer 1

False
You can supply a comma-separated list of properties in the orderby clause.

Question 2

LINQ allows you to select from a data source items that meet a set of conditions.

Answer 2

True

Question 3

A List< T > is similar to an array,but can also _________.

A) dynamically resize
B) add items anywhere in the List< T >
C) contain objects of any one type
D) Both a and b

Answer 3

D

Question 4

The ________ extension method is typically used to determine whether a LINQ query's results are non-empty.

A) Any
B) First
C) Count
D) None of the above

Question 5

What method returns the number of items in LINQ query result q

A) Length
B) Size
C) getUpperBound
D) Count

Question 6

TheNET collection classes provide flexible,efficient alternatives to arrays.

Question 7

The international standard for querying relational databases is called:

A) XML
B) SQL
C) HTTP
D) LINQ

Question 8

Visual C# requires you to write SQL to query data sources.

Question 9

The range variable is implicitly defined in the _____ clause and used to produce results in the ______ clause

A) where, put
B) from, put
C) from, select
D) where, select
E) in, foreach

Question 10

In a LINQ query,the where clause specifies          .

A) the data source
B) where to put the data
C) the condition(s) for including the item
D) the Location property
D) the data type

Question 11

The ________ extension method indicates that only unique values should be included in a LINQ query's results.

A) Any
B) Distinct
C) Count
D) None of the above

Question 12

You can sort a LINQ query's results only by one property.

Question 13

Collections of type List< T > can hold objects of what type

A) only other lists
B) only integers
C) objects of any one type
D) None of the above

Question 14

The ________ extension method is returns the number of results in a LINQ query.

A) Any
B) First
C) Count
D) None of the above

Question 15

Unlike arrays,lists do not resize automatically.

Question 16

The objects returned when using multiple properties in a select clause are objects of an anonymous type.

Question 17

You can sort a LINQ query's results only by one property.

Question 18

If multiple properties are listed in the select clause,the results will be of type SelectedList.

Question 19

The results of a LINQ query can have only the same type as the data being queried-for example,a LINQ query on a collection of Employee objects will always have Employee objects in the results.

Question 20

A generic method does not need an object of the class in order to execute.

Question 21

The Capacity property indicates the number of elements stored in the List< T >.

Question 22

Which of the following statements about LINQ is false

A) A new LINQ query must be used when changes are made to the data source.
B) A LINQ query does not need to have a let clause
C) A LINQ query returns an IEnumerable object
D) LINQ stands for Language Integrated Query.

Question 23

A let clause is used to create _______.

A) a method within a LINQ query
B) a subquery
C) a new range variable
D) None of the above

Question 24

A List< T > can automatically resize itself to accommodate additional elements.

Question 25

LINQ is used to query collections in the same way it's used to query arrays.

Question 26

Elements can be added at any location within an array after it's created.

Question 27

A LINQ query is executed when it's created.