C# Tips - C# Quiz Test 201

1. The following C# code is using C# Generics. Which is an incorrect explanation?

T t = default(T);

If T is int type, variable t has 0

If T is a reference type, variable t has null

If T is string type, variable t has an empty string

If T is bool type, variable t has false

2. C# / .NET supports various built-in data structures. Which of the following data structures does not exist as built-in?

3. Which of the following interfaces should be implemented to use LINQ to Objects?

IEnumerable

ICollection

4. What is the result of the following C# code?

null will be displayed in console

4 will be displayed in console

Will cause compile error

Runtime exception will occur

5. Find an invalid example of using C# var

var a = 3.141592;

var a = null;

var a = db.Stores;

var a = db.Stores.Single(p => p.Id == 1);

6. In the following C# example, variable a is string. Find one that either is wrong or returns a different result.

a = a ?? "";

a = a == null ? "" : a;

a = (a is null) ? "" : a;

if (a == null) a = "";

7. When you want to provide other resources for other cultures or languages, which assembly should you create?

Public Assembly

Private Assembly

Shared Assembly

Satellite Assembly

8. Which of the followings does not allow you to use C# static keyword?

(Method) static void Run() {}

(Property) static int Prop {get; set;}

(Field) static int _field;

(Class) static class MyClass {}

(Constructor) static MyClass() {}

(Destructor) static ~MyClass() {}

(Event) static event EventHandler evt;

9. In C#, what is similar to C++ function pointer?

Event

Interface

Delegate

Method

10. Which of the following C# methods is not valid? (method body elided)

public void Set(dynamic o) {}

public dynamic Get() {}

private var GetData() {}

protected override int[] A() {}