How Can Multiple Inheritance Be Simulated in C#?

Simulate multiple inheritance in C#

C# itself does not support multiple inheritance (a class inheritance is from multiple parent classes). Nevertheless, simulation of this model in some cases is still very useful.

Use the interface and expansion method to combine

Rather than achieving multiple inheritance, it is better to consider using the interface combination. Define the interface for the required function and create a class that achieves all necessary interfaces. To simplify the method call, the expansion method characteristics of the C# 3.0 can be used.

This method allows you to combine classes, each class provides specific functions, and accesss them through simple and intuitive interfaces. For example:

Solution based on code -generated

public interface ISteerable { SteeringWheel wheel { get; set; } }
public interface IBrakable { BrakePedal brake { get; set; } }
public class Vehicle : ISteerable, IBrakable { ... }
public static class SteeringExtensions { ... }
public static class BrakeExtensions { ... }
...
Vehicle myCar = new Vehicle();
myCar.SteerLeft();
myCar.Stop();

Another method is to use code generation to inject the existing class into the new class. Although C# does not provide this syntax directly, tools like Roslyn or T4 text templates can promote code generation, allow you to define custom syntax and bridge the gap between multiple inheritance and combinations.

By using combination and code generation technology, you can effectively simulate the multiple inheritance in C# without introducing the complexity related to the real multiple inheritance.

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