A simple guide to encapsulating a function into an interface dll in C# encapsulation

Preface

In C#, encapsulating functions as interfaces and packaging them into DLLs (dynamic link libraries) is a very common practice for reuse and modularity of your code. Here is a simple step guide to how to achieve this:

1. Create a class library project

First, you need to create a Class Library Project instead of a console application or Windows Forms application.

• Open Visual Studio.
• Select Create New Project.
• Search for "Class Library" templates (usuallyClass Library (.NET Core)orClass Library (.NET Framework)) and select it.
• Name your project and select a save location, and click Create.

2. Define the interface

In a class library project, define one or more interfaces. An interface is a declaration of a method and does not contain an implementation of a method.

using System;

namespace MyLibrary
{
    public interface IMyInterface
    {
        void MyMethod(string input);
        int AnotherMethod(int x, int y);
    }
}

3. Implement the interface

You can implement these interfaces in the same project, or in different projects. Here we implement it in the same project.

using System;

namespace MyLibrary
{
    public class MyClass : IMyInterface
    {
        public void MyMethod(string input)
        {
            ("Input: " + input);
        }

        public int AnotherMethod(int x, int y)
        {
            return x + y;
        }
    }
}

4. Compile the project

Compiling the project will generate a DLL file. You can compile by following the steps:

• In Solution Explorer, right-click on your project.
• Select Build or Rebuild.

After successful compilation, the DLL file is usually located in the projectbin\Debug\(For .NET Core projects) orbin\Debug(For .NET Framework projects) directory.

5. Quoting DLL

Now you can reference this DLL in other projects.

• Right-click on the project you need to reference the DLL and select "Add" > "Reference".
• In the Browse tab, locate and add the DLL file you generated.

6. Use interfaces and implement classes

In projects that reference DLLs, you can use defined interfaces and implementation classes.

using System;
using MyLibrary; // Make sure your namespace is correct
namespace AnotherProject
{
    class Program
    {
        static void Main(string[] args)
        {
            IMyInterface myClassInstance = new MyClass();
            ("Hello, World!");
            int result = (3, 4);
            ("Result: " + result);
        }
    }
}

Summarize

The above are the basic steps to encapsulate functions into interfaces and package them into DLLs. This way, you can easily share and reuse code between different projects. In addition, the interface provides flexibility and decoupling, making your code easier to maintain and expand.

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