Custom attribute targets in C#: how do you specify what elements an attribute can be applied to?

Introduction / Context:When you create a custom attribute in C#, you typically want to control where it can be used (e.g., on classes, methods, properties). This is done with AttributeUsage.

Given Data / Assumptions:

• The attribute class derives from System.Attribute.
• We need to set allowed targets and other options (AllowMultiple, Inherited).

Concept / Approach:Apply [AttributeUsage(...)] or its full name [AttributeUsageAttribute(...)] to the attribute class definition. Both forms are equivalent because of the C# attribute naming convention that allows omitting the trailing “Attribute”.

Step-by-Step Solution:

Verification / Alternative check:Attempt to apply the attribute to a disallowed target; the compiler will emit an error referencing AttributeUsage settings.

Why Other Options Are Wrong:“UsageAttribute” is not a framework attribute. Attributes do not default to “all targets.”

Common Pitfalls:Forgetting that AttributeUsage controls inheritance and multiplicity; omitting it leads to default values (AttributeTargets.All, AllowMultiple = false, Inherited = true for some cases), which might not match your intent.

Final Answer:By applying AttributeUsage to the custom attribute class definition