List Join

+++ Program that joins List of strings (C# .NET 4.0) +++

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        // Create a List of three strings.
        var list = new List<string>() { "cat", "dog", "rat" };
        // Join the strings from the List.
        string joined = string.Join<string>("*", list);
        // Display.
        Console.WriteLine(joined);
    }
}

 

   1.
      IEnumerable<long> ids = new long[]{1,3,4,5};
   2.
      string delimitedIds = string.Join(",", ids.Select(x => x.ToString()).ToArray());

 

            // Array ToString "," separated
            int[] intArray = { 1, 2, 3 };
            Console.WriteLine(intArray.ToString(","));
            // output: 1,2,3

            // ArrayList ToString ":" separated
            ArrayList arrayList = new ArrayList() { 1, 2, 3 };
            Console.WriteLine(arrayList.ToString(":"));
            // output 1:2:3

            // A class object List ToString " - " separated
            List<Foo> foos = new List<Foo>()
            {
                new Foo() { Name = "foo1", Number = 1 },
                new Foo() { Name = "foo2", Number = 2 },
                new Foo() { Name = "foo3", Number = 3 },
            };
            Console.WriteLine(foos.ToString(" - "));
            // output 'foo1 1' - 'foo2 2' - 'foo3 3'

            // A struct List ToString "||" separated
            List<StructFoo> sfoos = new List< StructFoo >()
            {
                new StructFoo() { Name = "sfoo1", Number = 1 },
                new StructFoo() { Name = "sfoo2", Number = 2 },
                new StructFoo() { Name = "sfoo3", Number = 3 },
            };
            Console.WriteLine(sfoos.ToString("||"));
            // output 'sfoo1 1'||'sfoo2 2'||'sfoo3 3'

            // A generic dictionary ToString "," separated
            Dictionary< int, Foo > dictionary = new Dictionary< int, Foo >()
            {
              { 1, new Foo() { Name = "foo1", Number = 1 }},
              { 2, new Foo() { Name = "foo2", Number = 2 }},
              { 3, new Foo() { Name = "foo3", Number = 3 }},
            };
            Console.WriteLine(dictionary.ToString(","));
            // output: [1, 'foo1 1'],[2, 'foo2 2'],[3, 'foo3 3']

            // string as IEnumerable char
            string text = "abcdefg";
            Console.WriteLine(text.ToString(","));
            // output: a,b,c,d,e,f,g