Getting values using index in List C#

Question

I am Searching for Desired output, Here is the right place where I can get that.

I have two List in c# as ids1list ,ids2list

ids1list:
Title
nen154
source

ids2list:
tittl
Title
nen154
WTOC
source 
style

I am comparing these two as var result = ids1list.Intersect(ids2list).ToList();

In result I am getting Common Values Here I want Index of ids2list Which are Common values in ids1list

Some on Suggested me like this,

        ids1list.Select(s => new 
        {
            Id = s, Index = ids2list.IndexOf(s) 
        });

But It not yet worked for me, Can anyone give me proper solution. Because I strucked here.

what is the type of list? List<string>?

cuongle
– cuongle

2013-07-01 15:33:45 +00:00
Commented Jul 1, 2013 at 15:33 — cuongle
– cuongle, Commented Jul 1, 2013 at 15:33
So you want those that have the same index?

It'sNotALie.
– It'sNotALie.

2013-07-01 15:34:01 +00:00
Commented Jul 1, 2013 at 15:34 — It'sNotALie.
– It'sNotALie., Commented Jul 1, 2013 at 15:34
Yes, It is List<String>

Kumar
– Kumar

2013-07-01 15:37:19 +00:00
Commented Jul 1, 2013 at 15:37 — Kumar
– Kumar, Commented Jul 1, 2013 at 15:37

Tim Schmelter · Accepted Answer · 2013-07-01 16:09:59Z

6

You have to select the second list if you want it's indices:

IEnumerable<int> indices = ids2list
    .Select((s, i) => new{ Str = s, Index = i })
    .Where(x => ids1list.Contains(x.Str))
    .Select(x => x.Index);

Another approach similar to yours:

indices = ids1list
    .Select(s => new{ Str = s, Index = ids2list.IndexOf(s) })
    .Where(x => x.Index >= 0)
    .Select(x=> x.Index);

edited Jul 1, 2013 at 16:09

answered Jul 1, 2013 at 15:34

Tim Schmelter

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6 Comments

It'sNotALie. Over a year ago

I have a feeling that is not what he's looking for.

Tim Schmelter Over a year ago

@newStackExchangeInstance: " I want Index of ids2list Which are Common values in ids1list"

It'sNotALie. Over a year ago

I don't know how you can understand that :P

Scott Chamberlain Over a year ago

@newStackExchangeInstance Speaking "New User" is an acquired skill.

Kumar Over a year ago

@TimSchmelter It seems Very nice, I want to go through it, & I have a Doudbt on this. What is IEnumerable<int> Can I use it as a list. Why because using theseindex I going to fetch Values from third List,Thanks.

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