gs gs108 Delegates, Generics and LINQ - Fundamental of LINQ - Quiz No.1
gs gs108 CSharp Quiz
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Question 1: Assume 2 columns named as Product and Category how can be both sorted out based on first by category and then by product name?
var sortedProds = _db.Products.Orderby(c => c.Category)
var sortedProds = _db.Products.Orderby(c => c.Category) + ThenBy(n => n.Name)
var sortedProds = _db.Products.Orderby(c => c.Category) . ThenBy(n => n.Name)
all of the mentioned
Question 2: Choose the wrong statement about the LINQ?
The main concept behind the linq is query
linq makes use of foreach loop to execute the query
It is not required that linq should make use of IEnumerable interface
None of the mentioned
Question 3: Choose the namespace in which the interface IEnumerable is declared?
System.Collections
System.Collections.Generic
Both System.Collections & System.Collections.Generic
None of the mentioned
Question 4: Can we use linq to query against a DataTable?
Yes
No
Either Yes or No
None of the mentioned
Question 5: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5}; var posNums = from n in nums where n >= 0 select n; foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }
0, 1, -2, -4, 5
1, 3, 0, 5
1, 3, 5
Run time error
Question 6: Select the namespace which should be included while making use of LINQ operations?
System.Text
System.Collections.Generic
System.Linq
None of the mentioned
Question 7: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; var posNums = from n in nums where n % 2 ==0 select n; Console.Write("The positive values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }
code run successfully prints nothing
run time error
code run successfully and executes output
compile time error
Question 8: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { int[] nums = { 1, -2, 3, 0, -4, 5 }; var posNums = from n in nums where n > -5 && n < 6 orderby n descending select n; Console.Write("The positive values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }
Prints nothing code runs successfully
Run time error
Arranged in descending order code runs successfully
Compile time error
Question 9: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { int[] nums = { 16, 9, 25}; var posNums = from n in nums where n > 0 select Math.Sqrt(n); Console.Write("The positive values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }
Code runs successfully prints nothing
Code runs successfully prints required output
Run time error
Compile time error
Question 10: What will be the output of the following C# code snippet?
class Program { static void Main(string[] args) { int[] nums = {1}; var posNums = from n in nums wheres n > 0 select Math.Max(78, 9); Console.Write("The largest values in nums: "); foreach (int i in posNums) Console.Write(i + " "); Console.WriteLine(); Console.ReadLine(); } }
Code runs successfully prints nothing
Run time error
Code runs successfully prints required output
Compile time error
