C# Online Compiler | .NET Fiddle

<no name> by Anonymous

using System;
using System.Collections.Generic;
					
public class Program
{
	private class Test1
	{
		public string id;
	}
	
	public static void Main()
	{
		var _duplicards = new List<Test1>
		{
			new Test1{id = "nonexistent"}, new Test1{id = "1"}, new Test1{id = "2"}
		};

		var list = new List<Test1>
		{
			new Test1{id = "1"}, new Test1{id = "2"}, new Test1{id = "3"}
		};

		var nonexistent = _duplicards.FindAll(prev => list.Find(cur => cur.id == prev.id) == null);
		
		foreach (var item in nonexistent)
		{
			Console.WriteLine(item.id);
		}
	}
}

​x
 
using System;
using System.Collections.Generic;
                    
public class Program
{
    private class Test1
    {
        public string id;
    }
    
    public static void Main()
    {
        var _duplicards = new List<Test1>
        {
            new Test1{id = "nonexistent"}, new Test1{id = "1"}, new Test1{id = "2"}
        };
​
        var list = new List<Test1>
        {
            new Test1{id = "1"}, new Test1{id = "2"}, new Test1{id = "3"}
        };
​
        var nonexistent = _duplicards.FindAll(prev => list.Find(cur => cur.id == prev.id) == null);
        
        foreach (var item in nonexistent)
        {
            Console.WriteLine(item.id);
        }
    }
}

Unhandled exception. System.AggregateException: One or more errors occurred. (The type initializer for 'System.Data.Entity.DbContext' threw an exception.)
---> System.TypeInitializationException: The type initializer for 'System.Data.Entity.DbContext' threw an exception.
---> System.TypeInitializationException: The type initializer for 'Z.EntityFramework.Classic.EntityFrameworkManager' threw an exception.
---> System.TypeInitializationException: The type initializer for '' threw an exception.
---> System.IO.FileNotFoundException: Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

File name: 'System.Configuration.ConfigurationManager, Version=8.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
   at Z.Expressions.CompilerManager..cctor()
   at Z.Expressions.CompilerManager.LoadEntityFrameworkClassicConfiguration()
   at Z.Expressions.ExceptionMessage.ThrowLicenseException()
   at ..cctor()
   --- End of inner exception stack trace ---
   at .()
   at Z.EntityFramework.Classic.EntityFrameworkManager..cctor()
   --- End of inner exception stack trace ---
   at Z.EntityFramework.Classic.EntityFrameworkManager.Initialize()
   at System.Data.Entity.DbContext..cctor()
   --- End of inner exception stack trace ---
   at System.Data.Entity.DbContext..ctor(String nameOrConnectionString)
   at Program.EntityContext..ctor()
   at Program.GenerateData()
   at Program.MainAsync()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
   at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
   at System.Threading.Tasks.Task.Wait()
   at Program.Main()
Command terminated by signal 6

Last Run:	7:41:34 am
Compile:	0.054s
Execute:	0.2s
Memory:	11.39Mb
CPU:	0.254s

View IL Code