Attribute declaration syntax in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to apply a simple attribute named MyAttribute.

C Sharp (C#)

[[1]]
public class MyClass {}

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Apublic

BAttribute

Cclass

DMyAttribute

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the square brackets.

Using 'class' instead of the attribute name.

The correct syntax to apply an attribute uses the attribute name inside square brackets. The class name conventionally ends with Attribute, but the suffix is omitted when applying the attribute.

2fill in blank

medium

Complete the code to declare a custom attribute class named SampleAttribute.

C Sharp (C#)

public class [1] : System.Attribute {}

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ASample

BSampleAttribute

CAttribute

DCustomAttribute

Attempts:

3 left

💡 Hint

Common Mistakes

Not inheriting from System.Attribute.

Missing the 'Attribute' suffix in the class name.

Custom attributes must inherit from System.Attribute. The class name conventionally ends with 'Attribute'.

3fill in blank

hard

Fix the error in the attribute usage syntax.

C Sharp (C#)

[Obsolete[1]]
public void OldMethod() {}

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A()

B[]

C{}

D<>

Attempts:

3 left

💡 Hint

Common Mistakes

Using curly braces instead of parentheses.

Omitting parentheses when parameters are expected.

When using an attribute with parameters, parentheses () are required even if no parameters are passed.

4fill in blank

hard

Fill both blanks to declare an attribute with a positional parameter.

C Sharp (C#)

public class [1] : System.Attribute {
    public [2](string name) {}
}

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AAuthorAttribute

BMyAttribute

CAuthorAttr

DAuthor

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same name for class and constructor.

Not matching constructor name to class name without 'Attribute'.

The class name should be AuthorAttribute and the constructor name should be Author to allow usage as [Author("name")].

5fill in blank

hard

Fill all three blanks to declare and use a named parameter in an attribute.

C Sharp (C#)

[[1](Version = [2])]
public class MyClass {}

public class [3] : System.Attribute {
    public string Version { get; set; }
}

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AVersionInfo

B"1.0"

CVersionInfoAttribute

D"v1"

Attempts:

3 left

💡 Hint

Common Mistakes

Including 'Attribute' suffix in usage.

Using incorrect string value syntax.

The attribute is used as [VersionInfo(Version = "1.0")]. The class name is VersionInfoAttribute but usage drops the 'Attribute' suffix. Named parameters correspond to public properties.