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description: "Check what you've learned in this module."
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ms.date: 04/22/2025
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author: wwlpublish
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ms.author: cahowd
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ms.topic: unit
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durationInMinutes: 3
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content: |
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[!include[](includes/07-knowledge-check.md)]
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quiz:
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title: "Check your knowledge"
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questions:
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- content: "What is the main purpose of delegates in C#?"
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choices:
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- content: "To determine at compile time which method will be called."
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isCorrect: false
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explanation: "Incorrect. Delegates are used for late binding, where the method to be called is determined at runtime."
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- content: "To encapsulate methods and instantiate them as objects, allowing methods to be stored in variables, passed as arguments, and invoked at a later time."
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isCorrect: true
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explanation: "Correct. Delegates in C# are used to encapsulate methods, enabling dynamic method invocation."
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- content: "To encapsulate classes and instantiate them as objects."
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isCorrect: false
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explanation: "Incorrect. Delegates are used to encapsulate methods, not classes."
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- content: "What is the purpose of using delegates in C#?"
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choices:
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- content: "To encapsulate a method with a specific signature and allow for flexible and dynamic method invocation."
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isCorrect: true
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explanation: "Correct. Delegates in C# are used to encapsulate a method with a specific signature, allowing for flexible and dynamic method invocation."
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- content: "To create and manage databases in C#."
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isCorrect: false
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explanation: "Incorrect. Delegates aren't used for creating or managing databases. They're used to encapsulate a method with a specific signature."
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- content: "To design user interfaces in C#."
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isCorrect: false
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explanation: "Incorrect. Delegates aren't used for designing user interfaces. They're used to encapsulate a method with a specific signature."
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- content: "What is the main difference between `Action` and `Func` delegates in C#?"
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choices:
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- content: "`Action` delegates can take up to 16 parameters, while `Func` delegates can only take up to 8 parameters."
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isCorrect: false
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explanation: "Incorrect. Both `Action` and `Func` delegates can take up to 16 parameters."
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- content: "`Action` delegates are used for methods that return a value, while `Func` delegates are used for methods that don't return a value."
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isCorrect: false
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explanation: "Incorrect. This answer choice describes the opposite of the actual definitions. `Action` delegates are used for methods that don't return a value, while `Func` delegates are used for methods that return a value."
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- content: "`Action` delegates are used for methods that don't return a value, while `Func` delegates are used for methods that return a value."
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isCorrect: true
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explanation: "Correct. This answer choice describes the main difference between `Action` and `Func` delegates in C#."
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- content: "What does variance in C# allow?"
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choices:
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- content: "It allows a developer to assign methods to delegates even if their parameter types or return types are completely different."
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isCorrect: false
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explanation: "Incorrect. Variance allows the assignment of methods to delegates if their parameter types or return types aren't exactly the same, but they must follow certain rules."
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- content: "It allows a developer to use a more derived type than the one specified in a delegate or interface and to assign methods to delegates even if their parameter types or return types aren't exactly the same, as long as they follow certain rules."
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isCorrect: true
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explanation: "Correct. Variance in C# allows for more flexible method signatures with delegates and enables the use of a more derived type than the one specified in a delegate or interface."
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- content: "It allows a developer to use a less derived type than the one specified in a delegate or interface."
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isCorrect: false
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explanation: "Incorrect. Variance allows a developer to use a more derived type than the one specified in a delegate or interface."
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- content: "What is the purpose of using delegates in a C# application?"
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choices:
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- content: "To perform mathematical operations."
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isCorrect: false
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explanation: "Incorrect. Delegates aren't specifically used for mathematical operations, they're used to encapsulate a method with a specific signature and return type."
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- content: "To encapsulate a method with a specific signature and return type."
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isCorrect: true
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explanation: "Correct. Delegates in C# are used to encapsulate a method with a specific signature and return type. They can be used to implement callback methods that run when an asynchronous operation completes."
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- content: "To create user interfaces."
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isCorrect: false
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explanation: "Incorrect. Delegates aren't used to create user interfaces. They're used to encapsulate a method with a specific signature and return type."
C# provides a rich set of features that allow developers to create robust and maintainable applications. One important feature of C# is its support for delegates, which are a fundamental part of the language's type system. Delegates enable developers to encapsulate methods and pass them as parameters, allowing for flexible and extensible code design.
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Imagine you're a software developer working for a financial technology company. Your team is tasked with developing a banking application that handles various operations like transactions and customer management. The application needs to be highly modular and maintainable, with the ability to perform certain tasks dynamically based on user actions or system events. However, you're facing challenges in implementing these dynamic behaviors and ensuring type safety. You also need to make the code more readable and easier to maintain. To address these challenges, you decide to leverage the power of delegates in C#.
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The topics covered in this module include:
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- Understanding what delegates are and the coding scenarios that use delegates.
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- Understanding strongly typed delegates and how they're used in C#.
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- Understanding variance in delegates and generics in C#.
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- Declaring, instantiating, and invoking delegates in a C# application.
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After completing this module, you’ll be able to:
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- Explain the concept of delegates in C# and their benefits in terms of flexibility, extensibility, and decoupling.
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- Describe how to declare, instantiate, and invoke delegates using various methods, including named methods, anonymous methods, and lambda expressions.
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- Explain how delegates are used in sorting, callback, and other real-world scenarios.
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- Describe how strongly typed delegates like `Action` and `Func` simplify your code and improve readability.
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- Explain how variance in C# enhances flexibility in method signatures with delegates.
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