Runtime cost of dynamic type resolution in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a dynamic variable.

C Sharp (C#)

dynamic value = [1];

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Anull

B"text"

Ctrue

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around 10 makes it a string, not an integer.

The dynamic keyword allows the variable to hold any type. Here, assigning the integer 10 is valid.

2fill in blank

medium

Complete the code to access the length property on a dynamic variable.

C Sharp (C#)

dynamic obj = "hello";
int length = obj.[1];

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ALength

Blength

CCount

DGetLength

Attempts:

3 left

💡 Hint

Common Mistakes

Using Count is for collections, not strings.

The Length property returns the number of characters in a string. When using dynamic, this is resolved at runtime.

3fill in blank

hard

Fix the error in the dynamic method call.

C Sharp (C#)

dynamic obj = 123;
string text = obj.[1]();

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AtoString

BToString

CConvert

DParse

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'toString' causes a runtime error.

The method ToString() converts the integer to its string representation. It is case-sensitive and must be capitalized.

4fill in blank

hard

Fill both blanks to create a dictionary with dynamic keys and values.

C Sharp (C#)

var dict = new Dictionary<[1], [2]>();

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Adynamic

Bstring

Cint

Dobject

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing static types like string or int causes type errors.

Using dynamic for both key and value types allows runtime type resolution for dictionary entries.

5fill in blank

hard

Fill all three blanks to create a dynamic method call with runtime type resolution.

C Sharp (C#)

dynamic obj = GetDynamicObject();
var result = obj.[1]([2]: [3]);

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ACalculate

Bvalue

C42

DExecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong method names or parameter names causes runtime errors.

The method Calculate is called with a named parameter value set to 42. This call is resolved at runtime due to dynamic.