Скачать или смотреть How to Control Method Accessibility in C# Based on Conditions with Polymorphism and Proxies

Discover how to make methods accessible in C# based on specific conditions using polymorphism and proxy design patterns.
---
This video is based on the question https://stackoverflow.com/q/63177174/ asked by the user 'Yukera' ( https://stackoverflow.com/u/10559197/ ) and on the answer https://stackoverflow.com/a/63177697/ provided by the user 'quaabaam' ( https://stackoverflow.com/u/9541862/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Is it possible to have method only accessible after certain conditions are met?

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Control Method Accessibility in C# Based on Conditions with Polymorphism and Proxies

In object-oriented programming, especially in C# , methods generally have a defined accessibility level based on their access modifiers. But what if you want to control the accessibility of methods dynamically based on certain conditions? For instance, consider you have two methods: MethodA which is an integer-returning method, and MethodB which returns a string. You want MethodA to be accessible only when a boolean variable, executable, is true. So how can you achieve this?

In this guide, we will explore solutions to dynamically control method access in C# using Polymorphism and a Proxy Pattern.

Problem Overview

Imagine this scenario: you have a class with two methods that return different data types. You only want one of those methods to be available based on the state of a boolean variable. The specific requirements are:

If executable is true, allow access to MethodA.

If executable is false, allow access to MethodB.

This requirement poses a challenge because C# doesn't inherently allow method accessibility to change at runtime, but several patterns can help us achieve the desired behavior.

Solution Approaches

Option # 1: Using Polymorphism and Generics

Polymorphism allows methods to be defined in a base class and implemented in derived classes, and generics make it possible to handle different data types. Here's a step-by-step breakdown of how to implement this:

Define an Interface: Create an interface that defines the method signature.

[[See Video to Reveal this Text or Code Snippet]]

Implement Specific Strategies: Create classes that implement the interface for each method type.

[[See Video to Reveal this Text or Code Snippet]]

Invoke Based on Condition: Use the boolean variable to determine which method to call.

[[See Video to Reveal this Text or Code Snippet]]

Option # 2: Using a Proxy Method

Another way to control access is through a proxy class that wraps the actual method calls. This method allows you to centralize the decision-making process regarding which method to call.

Create a Proxy Class: This class will contain the logic to decide which method to execute.

[[See Video to Reveal this Text or Code Snippet]]

Use the Proxy in Your Code: Create an instance of the proxy class and call the appropriate method based on the condition.

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

In this post, we have explored two effective options for controlling method accessibility based on specific conditions in C# . Whether you choose to employ Polymorphism with Generics or a Proxy Design Pattern depends on your specific use case and preferences.

Each approach has its unique advantages:

Polymorphism provides a clear, scalable structure that can be extended easily.

Proxies centralize control and may be simpler in less complex scenarios.

Experiment with these patterns in your own projects, and choose the one that best fits your design needs. Happy coding!