Csharp/CSharp Tutorial/Class/Partial Class

A partial class can span multiple source files.

using System;

public partial class MyClass {
    public void CoreMethodA() {
        Console.WriteLine("MyClass.CoreA");
    }
}
public class Starter {
    public static void Main() {
        MyClass obj = new MyClass();
        obj.CoreMethodA();
        obj.ExtendedMethodA();
    }
}

public partial class MyClass {
    public void ExtendedMethodA() {
        Console.WriteLine("MyClass.ExtendedA");
    }
}

Define and use partial class

using System; 
partial class XY { 
  int x; 
 
  public int X { 
    get { return x; } 
    set { x = value; } 
  } 
}

partial class XY { 
  int y; 
 
  public int Y { 
    get { return y; } 
    set { y = value; } 
  } 
}
 
class MainClass { 
  public static void Main() { 
    XY xy = new XY(); 
 
 
    Console.WriteLine(xy.X + "," + xy.Y); 
  } 
}

0,0

generic partial class

using System;
using System.ruponentModel;
    partial class Example<TFirst, TSecond>: IEquatable<string>where TFirst : class
    {
        public bool Equals(string other)
        {
            return false;
        }
    }