using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program {

    private static IList<Error> errors;

    public static void Main()

    {

        SeedErrors();

        Filter("1.0");

        for (int index = 0; index < errors.Count; index++) {

            Error error = errors[index];

            if (error == null || error.Occurrences.Count == 0) {

                // there are errors set to null (no occurrences), so they shouldn't be displayed

                // they are not deleted to prevent index shift - it's a deeper issue with this project

                continue; 

            }

            Console.WriteLine("Error number " + (index + 1));

            foreach (var occurrence in error.Occurrences) {

                foreach (var time in occurrence.Times.Values) {

                    Console.WriteLine(time.Version);    

                }

            }

        }

    }

    private static void Filter(string filterVersion)

    {

        for (int index = 0; index < errors.Count; index++) 

        {

            Error error = errors[index];

            foreach (var occurrence in error.Occurrences)

            {

                var toRemove = occurrence.Times.Keys.Where(key => occurrence.Times[key].Version != filterVersion).ToList();

                foreach (var key in toRemove)

                {

                    occurrence.Times.Remove(key);

                }

                if (occurrence.Times.Count == 0)

                {

                     errors[index] = null; // not deleted to prevent index shift, null is hidden in UI

                }

            }

        }

    }

    public static void SeedErrors()

    {

        errors = new List<Error>();

        var error1 = new Error() {

            Occurrences = new List<ErrorOccurrenceDetails>() {

                new ErrorOccurrenceDetails() {

                    Times = new Dictionary<DateTime, ErrorTime>() {

                        { DateTime.Now, new ErrorTime(){ Version = "1.0" }},

                        { DateTime.Now.AddDays(1),  new ErrorTime(){ Version = "1.0" }},

                        { DateTime.Now.AddDays(2),  new ErrorTime(){ Version = "1.0" }},

                        { DateTime.Now.AddDays(3),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(4),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(5),  new ErrorTime(){ Version = "1.0" }},

                        { DateTime.Now.AddDays(6),  new ErrorTime(){ Version = "1.1" }},

                    }   

                }

            }

        };

        var error2 = new Error() {

            Occurrences = new List<ErrorOccurrenceDetails>() {

                new ErrorOccurrenceDetails() {

                    Times = new Dictionary<DateTime, ErrorTime>() {

                        { DateTime.Now, new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(2),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(3),  new ErrorTime(){ Version = "1.0" }},

                        { DateTime.Now.AddDays(4),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(5),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(6),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(7),  new ErrorTime(){ Version = "1.0" }},

                    }   

                }

            }

        };

        var error3 = new Error() {

            Occurrences = new List<ErrorOccurrenceDetails>() {

                new ErrorOccurrenceDetails() {

                    Times = new Dictionary<DateTime, ErrorTime>() {

                        { DateTime.Now, new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(2),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(3),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(4),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(5),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(6),  new ErrorTime(){ Version = "1.1" }},

                        { DateTime.Now.AddDays(7),  new ErrorTime(){ Version = "1.1" }},

                    }   

                }

            }

        };

        errors.Add(error1);

        errors.Add(error2);

        errors.Add(error3);

    }

}

​

public class Error

{

    public List<ErrorOccurrenceDetails> Occurrences { get; set; }

}

​

public class ErrorOccurrenceDetails

{

    public Dictionary<DateTime, ErrorTime> Times { get; set; }

}

​

public class ErrorTime

{

    public string Version { get; set; }

}

​