C# Interview Questions and Answers (958) - Page 45

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What will be the output of the below code segment? class Program { static void Main(string[] args) { Console.Write(string.Join("", "http://www.dotnetfunda.com/articles/show/3165/calculator-application-using-ironjs-and-wpf-by-invoking-an-external-ja".ToCharArray().Where(Char.IsDigit))); Console.ReadKey(true); } }

NOTE: This is objective type question, Please click question title for correct answer.

What will be the output of the below code segment? class Program { static void Main(string[] args) { Console.Write(string.Join(" ", "hello/3165/world".ToCharArray().Where(Char.IsLetter))); Console.ReadKey(true); } }

NOTE: This is objective type question, Please click question title for correct answer.

What will be the output of var result = Regex.Match("hati,ghora,apple,mango,babai", @"\bapple\b").Success; ?

NOTE: This is objective type question, Please click question title for correct answer.

What is the purpose of the Group Class in C#?

NOTE: This is objective type question, Please click question title for correct answer.

What is the purpose of Captures property of Group Class in C#?

NOTE: This is objective type question, Please click question title for correct answer.

What will be the output of bool containsApp = "hati,ghor,apple,mango,babai".Split(',') .Where(s => string.Compare("app", s, true) == 0) .Count() > 0;

NOTE: This is objective type question, Please click question title for correct answer.

What is String Interpolation?

C# 6.0 comes with a unique feature where the String Interpolation happens in between the strings.Rather than placing the positional placeholders in the old ways, we can use the real values like the way we have used the real properties inside the string braces. String Interpolation is a trick made by the compiler to invoke the string.Format function.

Consider the below class OuterClass { public void SayHelloFromOuterClass() { Console.WriteLine("Hello from Outer Class"); } public class InnerClass { public void SayHelloFromInnerClass() { Console.WriteLine("Hello from Inner Class"); } } } How to invoke SayHelloFromInnerClass() method?

NOTE: This is objective type question, Please click question title for correct answer.

What is the below piece of code performing namespace ConsoleApplication1 { public sealed class Singleton { private static Singleton instance = null; private static readonly object lockObj = new object(); Singleton(){} //private constructor public static Singleton Instance { get { lock (lockObj) { if (System.Object.ReferenceEquals(instance, null)) { instance = Inner.Instance; } return instance; } } } class Inner { Inner(){ }//private constructor public static Singleton Instance { get { return new Singleton(); } } } } }

NOTE: This is objective type question, Please click question title for correct answer.

What will be output of below code? public class MyClass { public void Test() { try { Console.WriteLine("Test"); } catch (Exception ex) { Console.WriteLine("Caught General Exception"); } catch (IndexOutOfRangeException ex) { Console.WriteLine("Caught IO Exception"); } } } Will this code compile?

NOTE: This is objective type question, Please click question title for correct answer.

What is the difference between throw and throw ex?

Throw does not clear the stack trace so all the classes from where the exception originated will appear in inner exception and stack trace. When we throw an exception by using throw ex, the stack trace is cleared,
and only the last exception is visible.

What is marshaling and what is use of it?

Marshaling is process of converting unmanaged data type to managed data type.
Let suppose you are using unmanaged code. Data type is different in different languages.
For example int data type in C# is Int32 and it is 32 bit.
But windows API has INT as integer data type. when we marshal Int32 to INT then we just change the type not data.

What will be output of following program? public class Base { public Base() { Console.WriteLine("Base"); } } public class Derived : Base { public Derived() { Console.WriteLine("Derived"); } } Public Class Main { static void Main(string[] args) { Derived obj=new Derived() } }

NOTE: This is objective type question, Please click question title for correct answer.

What will be output of following program? public class Base { public Base() { Console.WriteLine("Base"); } public Base(string name) { Console.WriteLine("Base: " + name); } } public class Derived : Base { public Derived() { Console.WriteLine("Derived"); } public Derived(string s) { Console.WriteLine("Derived: " + s); } } class Program { static void Main(string[] args) { Derived d = new Derived("rajesh"); Console.ReadLine(); } }

NOTE: This is objective type question, Please click question title for correct answer.

What will be output of following program? interface IInterface1 { void Show(); } interface IInterface2 { void Show(); } class A : IInterface1, IInterface2 { public void Show() { throw new NotImplementedException(); } }

NOTE: This is objective type question, Please click question title for correct answer.

Why multiple inheritance is not possible in c#?

This is Cause by diamond Shape problems of two classes. If two classes B and C inherit from A, and class D inherits from both B and C. If a method in D calls a method defined in A (and does not override it), and B and C have overridden that method differently, then via which class does it inherit: B, or C? It creates ambiguity and Simply, it will increase the complexity. So., multiple inheritance is not possible in C#. that is called Diamond Problem. But., in C# we can solve the Diamond problem with the help of interfaces in some cases.