Delegate test lambda, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            Console.WriteLine(PerformOperation("+",3.2,4));
            Console.WriteLine(PerformOperation("-",3.2,4));
            Console.WriteLine(PerformOperation("*",3.2,4));
            Console.WriteLine(PerformOperation("/",3.2,4));
        }
        
    static private Dictionary<string, Func<double, double, double>> _operations =
	new Dictionary<string, Func<double, double, double>>
	{
		{ "+", (x, y) => x + y },
		{ "-", (x, y) => x - y },
		{ "*", DoMultiplication },
		{ "/", DoDivision },
	};  
        
     static   private double DoDivision(double x, double y) { return x / y; }
     static   private double DoMultiplication(double x, double y) { return x * y; }
     static   public double PerformOperation(string op, double x, double y)
{
	if (!_operations.ContainsKey(op))
		throw new ArgumentException(string.Format("Operation {0} is invalid", op), "op");
	return _operations[op](x, y);
}   
    }   
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 13 Mb, average nr of threads: 3