Get Datatype from the List of Different Datatype c#

Question

I need to get Datatype from the List of Different Datatype c#

public interface IMachine { … }

public class MachineLine : IMachine
{
    public double X1;
    public double Y1;
    public double X2;
    public double Y2;
    public double Thickness;
}

public class MachineCircle : IMachine
{
    public double CenterX;
    public double CenterY;
    public double Radius;
}


foreach (IMachineSomething sth in m)
{
    if (sth is MachineLine)
    {
        var machineLine = (MachineLine)sth;
        machineLine.DoThis();
    }
    else if (sth is MachineCircle)
    {
        var machineCircle = (MachineCircle)sth;
        machineCircle.DoThat();
    }
    else …
}

Requirement : I dont want to loop into each item, but get datatype from the List of different datatype.

Answer 1

If you want to perform some specific actions depending on type, then consider this approach:

public interface IMachine 
{
    void DoSometing1( );
}

public class MachineLine : IMachine
{
    public double X1;
    public double Y1;
    public double X2;
    public double Y2;
    public double Thickness;

    public void DoSometing1( )
    {
        // . . .
    }
}

public class MachineCircle : IMachine
{
    public double CenterX;
    public double CenterY;
    public double Radius;

    public void DoSometing1( )
    {
        // . . .
    }
}

. . .

foreach( IMachine sth in m)
{
    sth.DoSomething1( );
}

Answer 2

Hi,
try this console demo:

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApp2
{
  class Program
  {
    static void Main(string[] args)
    {
      List<object> m = new List<object>();

      m.Add(new MachineLine());
      m.Add(new MachineCircle());
      m.Add(new MachineLine());
      m.Add(new MachineCircle());

      foreach (object sth in m.Where((o) => o is MachineLine))
      {
        var machineLine = (MachineLine)sth;
        machineLine.DoThis();
      }

      foreach (object sth in m.Where((o) => o is MachineCircle))
      {
        var machineCircle = (MachineCircle)sth;
        machineCircle.DoThat();
      }

    }

    public interface IMachine
    {
      public void DoThis();
      public void DoThat();
    }

    public class MachineLine : IMachine
    {
      public double X1;
      public double Y1;
      public double X2;
      public double Y2;
      public double Thickness;
      public void DoThis() => Console.WriteLine("MachineLine");
      public void DoThat() => throw new NotImplementedException();

    }

    public class MachineCircle : IMachine
    {
      public double CenterX;
      public double CenterY;
      public double Radius;
      public void DoThis() => throw new NotImplementedException();
      public void DoThat() => Console.WriteLine("MachineCircle");
    }
  }
}