Multiple generic parameters in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a generic class with two type parameters.

C Sharp (C#)

public class Pair<[1], U> { }

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AT

Bint

Cstring

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Using concrete types like int or string instead of type parameters.

Using keywords like var as type parameters.

The first generic type parameter is usually named T by convention.

2fill in blank

medium

Complete the method signature to use two generic parameters.

C Sharp (C#)

public void Swap<[1], V>(ref T a, ref V b) { }

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AT

Bstring

Cint

Dvar

Attempts:

3 left

💡 Hint

Common Mistakes

Using concrete types instead of generic parameters.

Using invalid identifiers as generic parameters.

The method uses two generic parameters: T and V.

3fill in blank

hard

Fix the error in the generic class declaration.

C Sharp (C#)

public class Container<[1], U> { }

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A1T

BT1

CT

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Starting generic parameter names with numbers.

Using reserved keywords or concrete types.

Generic type parameters must be valid identifiers, usually a single uppercase letter like T.

4fill in blank

hard

Fill both blanks to declare a generic method with two parameters and return type.

C Sharp (C#)

public [1] Combine<[2], V>(T first, V second) { return default; }

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AT

Bint

Cvoid

Dstring

Attempts:

3 left

💡 Hint

Common Mistakes

Using void as return type when a value is returned.

Using concrete types as generic parameters.

The method returns a string and has generic parameters T and V.

5fill in blank

hard

Fill all three blanks to declare a generic class with constraints on two parameters.

C Sharp (C#)

public class Repository<[1], [2]> where [3] : class where U : new() { }

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AT

BU

DV

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up generic parameter names in constraints.

Using invalid identifiers for generic parameters.

The class has generic parameters T and U. The constraint where T : class applies to T.