How Can I Use Or Call The Data In List<List<String>>

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when we use a list we can call use them like Somelisr[0] Somlist[1] by point the index but how can i use the data in list<list> any one guide me please

or anyone have an easyiest way to use it , Please Shere i really need to know here us my code

C#

List<list><string>> Wayfinder = new List<list><string>>();

        Wayfinder.Add(new List<string> { "a", "b" });
        Wayfinder.Add(new List<string> { "c", "d" });
        Wayfinder.Add(new List<string> { "e", "f" });
        Wayfinder.Add(new List<string> { "g", "h","i","j" });

PS; well, i have to get each of it data and use intersec or union to find the same data in those lise .

code block added

Posted 5-May-14 3:51am

Real_Criffer

Updated 5-May-14 5:03am

Nelek

v3

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Sergey Alexandrovich Kryukov 5-May-14 10:51am

Please format the code properly; it does not show the list type. Is it System.Collections.Generic.List<>? where is the generic parameter?
The problem is not clear. What do you want to achieve?
—SA

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OriginalGriff · Accepted Answer · 2014-05-05T05:39:00

Solution 1

If what you mean is:

C#

List<list><string>> Wayfinder = new List<list><string>>();

Wayfinder.Add(new List<string> { "a", "b" });
Wayfinder.Add(new List<string> { "c", "d" });
Wayfinder.Add(new List<string> { "e", "f" });
Wayfinder.Add(new List<string> { "g", "h","i","j" });</string></string></string></string></string></list></string></list>

then you can find the union easily by using Linq:

C#

List<string> union = new List<string>();
foreach (List<string> list in Wayfinder)
    {
    union.AddRange(list);
    }
union = union.Distinct().OrderBy(u => u).ToList();</string></string></string>

Intersection is much the same:

C#

List<string> intersection = Wayfinder[0];
for (int i = 1; i < Wayfinder.Count; i++)
    {
    intersection = intersection.Intersect(Wayfinder[i]).ToList();
    }</string>

But in your example, it will be an empty list.

Posted 5-May-14 5:39am

OriginalGriff

Comments

Real_Criffer 5-May-14 12:46pm

i want to know what OrderBy(u => u) mean

thank you for you help Sir.

OriginalGriff 5-May-14 14:02pm

It's a Linq method which sorts the IEnumerable input using a (very) basic lambda expression: it basically saying "sort by: each element itself" rather than by any processing of the element.
I assume you are still learning? If so, you'll get to Linq and Lambda expressions later! Just "bleep" over it for the moment and accept it works... :laugh:

Real_Criffer 6-May-14 12:35pm

็haha Thx OrifinalGriff btw i try useing ur solution but it the result was system.generic something any clue ><'
PS: I am learning in the last year in the university .. i really need to know to work on my Project thank you for u advise sir

OriginalGriff 6-May-14 13:56pm

Check your "using" statements: make sure you have

using System.Linq;

in the list.

Real_Criffer 7-May-14 1:23am

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
List<List<string>> myList = new List<List<string>>();
myList.Add(new List<string> { "a", "b" });
myList.Add(new List<string> { "c", "d", "e" });
myList.Add(new List<string> { "qwerty", "asdf", "zxcv" });
myList.Add(new List<string> { "a", "b" });

// To iterate over it.
foreach (List<string> subList in myList)
{
foreach (string item in subList)
{
Console.WriteLine(item);
}
}
List<string> union = new List<string>();
foreach (List<string> list in myList)
{
union.AddRange(list);
}
union = union.Distinct().OrderBy(u => u).ToList();
Console.WriteLine(union);
//Console.WriteLine(myList[1]);
Console.ReadLine();
}
}
}
this is all what i have did i do something wrong ?

OriginalGriff 7-May-14 5:09am

It's possible it's the HTML system here that is messing things up - it's not fond of greater-than and less-than characters because they are also used for HTML tags...
So here is my code again, but altered:
List$List$string## Wayfinder = new List$List$string##();

Wayfinder.Add(new List$string# { "a", "b" });
Wayfinder.Add(new List$string# { "c", "d" });
Wayfinder.Add(new List$string# { "e", "f" });
Wayfinder.Add(new List$string# { "g", "h","i","j" });

List$string# union = new List$string#();
foreach (List$string# list in Wayfinder)
{
union.AddRange(list);
}
union = union.Distinct().OrderBy(u =# u).ToList();

List$string# intersection = Wayfinder[0];
for (int i = 1; i $ Wayfinder.Count; i++)
{
intersection = intersection.Intersect(Wayfinder[i]).ToList();
}
Each less-than is now a $, and each greater-than is now a #
So paste it in, highlight it and use find and replace to swap them back - it should compile and work fine.

Real_Criffer 7-May-14 5:33am

thx you sir
Sorry if i was not so good in this :)
Thx you your advise sir ! can i have your facebook account so if i have somthing i can contact you suddenly Sir! Please
MY FB ACCOUNT IS; Pacharavach Vacharakittanond Sit

OriginalGriff 7-May-14 5:46am

It wouldn't be any use to you - I don't go near FarceBook except a coupel of times a year :laugh:

Real_Criffer 7-May-14 5:40am

IT work Find sir! But when i try to show it on console

it said system.generic Sir

i use console.writeline(union);
or i have to use other command Sir?

OriginalGriff 7-May-14 5:50am

If you just said
Console.WriteLine(union);
then yes, you would get "System.Collections.Generic.List`1[System.String]" because it is a collection and they don't "know" how to display their contents.
Try:
foreach (string s in union)
{
Console.WriteLine(s);
}
Instead.

Real_Criffer 7-May-14 7:05am

Wow your are awesome Thx you Sit Thx your very much Sir

OriginalGriff 7-May-14 7:21am

You're welcome!

Real_Criffer 7-May-14 7:06am

if i get stuck with come thing can i send a message to you Sir

OriginalGriff 7-May-14 7:22am

Just post a new question - someone here will answer, I will if I see it.

Real_Criffer 7-May-14 7:36am

thx you