using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        int qtdeDias = 7;

        Console.WriteLine("Primeiro método");       

        DatasUteis1(qtdeDias).ForEach(p=> Console.WriteLine(p));

        Console.WriteLine("\nSegundo método");

        DatasUteis2(qtdeDias).ForEach(p=> Console.WriteLine(p));        

        Console.WriteLine("\nTerceiro método");

        foreach (var item in DatasUteis3(qtdeDias))

            Console.WriteLine("{0} - {1}", item.Key, item.Value);

        Console.WriteLine("\nQuarto método");

        foreach (var item in DatasUteis4(qtdeDias))

            Console.WriteLine("{0} - {1}", item.Key, item.Value);

        Console.WriteLine("\nQuinto método");

        foreach (var item in DatasUteis5(qtdeDias))

            Console.WriteLine("{0} - {1}", item.Key, item.Value);

    }

    public static List<DateTime> DatasUteis1(int quantidade)

    {

        List<DateTime> datas = new List<DateTime>();

        DateTime data = DateTime.Today;

        for (int i = 1; i <= quantidade; i++)

        {

            if (data.AddDays(i).DayOfWeek != DayOfWeek.Saturday && data.AddDays(i).DayOfWeek != DayOfWeek.Sunday)

                datas.Add(data.AddDays(i));

        }

​

        return datas;

    }

​

    public static List<DateTime> DatasUteis2(int quantidade)

    {

        List<DateTime> datas = new List<DateTime>();

        DateTime data = DateTime.Today;

        for (int i = 1; i <= quantidade; i++)

        {

            if (data.AddDays(i).DayOfWeek != DayOfWeek.Saturday && data.AddDays(i).DayOfWeek != DayOfWeek.Sunday)

                datas.Add(data.AddDays(i));

            else

                quantidade++;

        }

​

        return datas;

    }

​

    public static Dictionary<int, DateTime> DatasUteis3(int quantidade)

    {

        Dictionary<int, DateTime> datas = new Dictionary<int, DateTime>();

        DateTime data = DateTime.Today;

        for (int i = 1; i <= quantidade; i++)

        {

            if (data.AddDays(i).DayOfWeek != DayOfWeek.Saturday && data.AddDays(i).DayOfWeek != DayOfWeek.Sunday)

                datas.Add(i, data.AddDays(i));

        }

​

        return datas;

    }

​

    public static Dictionary<int, DateTime> DatasUteis4(int quantidade)

    {

        Dictionary<int, DateTime> datas = new Dictionary<int, DateTime>();

        DateTime data = DateTime.Today;

        for (int i = 1; i <= quantidade; i++)

        {

            if (data.AddDays(i).DayOfWeek != DayOfWeek.Saturday && data.AddDays(i).DayOfWeek != DayOfWeek.Sunday)

                datas.Add(i, data.AddDays(i));

            else

                quantidade++;

        }

​

        return datas;

    }

    public static Dictionary<int, DateTime> DatasUteis5(int quantidade)

    {

        Dictionary<int, DateTime> datas = new Dictionary<int, DateTime>();

        DateTime data = DateTime.Today;

        int counter = 1;

        for (int i = 1; i <= quantidade; i++)

        {

            if (data.AddDays(i).DayOfWeek != DayOfWeek.Saturday && data.AddDays(i).DayOfWeek != DayOfWeek.Sunday)

            {

                datas.Add(counter, data.AddDays(i));

                counter++;

            }

            else

                quantidade++;

        }

​

        return datas;

    }

}