Question

How to use Linq select new to create a new data structure fro string array in C#

Answer 1

using System;
using System.Linq;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static int snum;
        static int GetNum(string s)
        {
            return string.IsNullOrEmpty(s) ? -999 : snum++;
        }
        static void Main(string[] args)
        {
            string[] array = { "c1", "c2", "", "c3" };

            var result = from element in array
                         select new { str = element, num = GetNum(element) };

            foreach (var part in result)
                Console.WriteLine(part);

            Console.WriteLine();

            foreach (var part in result)
            {
                string s = part.str;
                int num = part.num;

                Console.WriteLine("s = {0}, num = {1}", s, num);
            }
        }
    }
}


/*
run:

{ str = c1, num = 0 }
{ str = c2, num = 1 }
{ str = , num = -999 }
{ str = c3, num = 2 }

s = c1, num = 3
s = c2, num = 4
s = , num = -999
s = c3, num = 5

*/

 

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Answer 2

using System;
using System.Linq;

namespace ConsoleApplication_C_Sharp
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] array = { "c#", "c", "c++", "java", "python" };
            int n = 87;

            var html = from item in array
                       select new { Html = "<h>" + item + "</h1><br />", knowledge = n++ };

            foreach (var value in html)
            {
                Console.Write(value.Html);
                Console.WriteLine(" " + value.knowledge);
            }
        }
    }
}


/*
run:

<h>c#</h1><br /> 87
<h>c</h1><br /> 88
<h>c++</h1><br /> 89
<h>java</h1><br /> 90
<h>python</h1><br /> 91

*/

 

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