Interface definition

Context: Define an interface using the interface keyword. It can contain methods, properties, events, and indexers.

Syntax

[access modifier] interface IInterfaceName
{
    // method signature
    int DoWork(string input);

    // property signature
    string Name { get; set; }

    // event
    event EventHandler Updated;
}

Naming Convention

Prefix with I (e.g., IComparable, IDisposable).

Example

public interface ILogger
{
    void Log(string message);
    bool IsEnabled { get; set; }
}

Interface Inheritance

Interfaces can inherit from other interfaces.

public interface IReadable { string Read(); }
public interface IWritable { void Write(string data); }
public interface IReadWrite : IReadable, IWritable { }