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description: "Understand advanced concepts of generics, including covariance, contravariance, and generic constraints, to write more flexible, and reusable code."
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choices:
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- content: "To allow code to handle multiple data types while ensuring type safety."
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isCorrect: true
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explanation: "Correct. Generics enable developers to write reusable code that works with different data types, ensuring type safety by catching errors at compile time."
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explanation: "Correct. Generics enables developers to write reusable code that works with different data types, ensuring type safety by catching errors at compile time."
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- content: "To improve runtime performance by optimizing memory usage."
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isCorrect: false
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explanation: "Incorrect. While generics can enhance performance by avoiding unnecessary type conversions, their primary purpose is to ensure type safety and code reusability."
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- content: "To simplify debugging by automatically generating error messages."
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isCorrect: false
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explanation: "Incorrect. Generics do not generate error messages for debugging; they ensure type safety during compilation, reducing runtime errors."
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explanation: "Incorrect. Generics does not generate error messages for debugging; they ensure type safety during compilation, reducing runtime errors."
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- content: "Which of the following is an example of a generic class?"
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- content: "`public class Box<T> { public T Item { get; set; } }`"
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isCorrect: true
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explanation: "Correct. This is a generic class where 'T' acts as a placeholder for the type, allowing the class to work with any data type."
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- content: "`public class Box { public int Item { get; set; } }`"
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isCorrect: false
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explanation: "Incorrect. This is a non-generic class because it is explicitly defined to work only with integers."
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explanation: "Incorrect. This is a non-generic class because it's explicitly defined to work only with integers."
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- content: "`public class Box { public void AddItem(string item) { } }`"
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isCorrect: false
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explanation: "Incorrect. This is a non-generic class because it is designed to work only with strings, not multiple data types."
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explanation: "Incorrect. This is a non-generic class because it's designed to work only with strings, not multiple data types."
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- content: "Which of the following scenarios is a common use case for anonymous types in C#?"
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- content: "Projecting selected properties in a Language-Integrated Query (LINQ)."
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isCorrect: true
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explanation: "Correct. Anonymous types are commonly used in LINQ queries to project results into objects with only the required properties."
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- content: "Defining a reusable class for multiple methods."
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isCorrect: false
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explanation: "Incorrect. Anonymous types are not reusable and are intended for temporary use within a single method."
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explanation: "Incorrect. Anonymous types aren't reusable and are intended for temporary use within a single method."
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- content: "Creating mutable objects for data manipulation."
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isCorrect: false
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explanation: "Incorrect. Anonymous types are immutable, meaning their properties are read-only and cannot be modified after creation."
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explanation: "Incorrect. Anonymous types are immutable, meaning their properties are read-only and can't be modified after creation."
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> [!TIP]
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> Use advanced generics to simplify complex scenarios while keeping your code reusable and type-safe.
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## Generic Interfaces
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## Generic interfaces
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Generic interfaces are a key feature of advanced generics, allowing you to define type-safe contracts for implementing classes. They're especially useful when you want to enforce consistent behavior across different types while maintaining flexibility.
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> [!TIP]
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> Covariance is useful when reading data, such as, iterating through a collection. Contravariance is useful when writing or processing data, such as passing parameters to a method.
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## Generic Math and Methods
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## Generic math and methods
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.NET 7 introduces generic math interfaces, enabling mathematical operations across numeric types.
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Imagine you're preparing a quick summary of items in a warehouse. Instead of creating detailed records for each item, you jot down only the key details you need, like the name and price, on a temporary list. This approach helps you stay organized without unnecessary complexity. Anonymous types in C# work similarly—they let you group related data into a temporary object without defining a full class, making your code simpler and more efficient.
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Imagine you're preparing a quick summary of items in a warehouse. Instead of creating detailed records for each item, you jot down only the key details you need, like the name and price, on a temporary list. This approach helps you stay organized without unnecessary complexity. Anonymous types in C# work similarlythey let you group related data into a temporary object without defining a full class, making your code simpler and more efficient.
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In this module, we addressed the challenge of creating flexible, reusable, and type-safe code in C#. We explored generics, advanced generic features, and anonymous types to simplify programming tasks, improve performance, and enhance code efficiency. By using generics and anoymous types, developers can write adaptable and efficient programs that handle varying data types and complex scenarios with ease.
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In this module, we addressed the challenge of creating flexible, reusable, and type-safe code in C#. We explored generics, advanced generic features, and anonymous types to simplify programming tasks, improve performance, and enhance code efficiency. By using generics and anonymous types, developers can write adaptable and efficient programs that handle varying data types and complex scenarios with ease.
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After completing this module, you're now able to:
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-[Generics in C#](/dotnet/csharp/programming-guide/generics/)
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-[Covariance and Contravariance in C#](/dotnet/csharp/programming-guide/concepts/covariance-contravariance/)
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-[Anonymous Types in C#](/en-us/dotnet/csharp/programming-guide/classes-and-structs/anonymous-types)
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-[Anonymous Types in C#](/dotnet/csharp/programming-guide/classes-and-structs/anonymous-types)
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-[Generic Math in .NET 7](/dotnet/generic-math-in-csharp-and-vb/)
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