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`? – cuongle Jul 01 '13 at 15:33 — cuongle, Jul 01 '13 at 15:33
So you want those that have the same index? – It'sNotALie. Jul 01 '13 at 15:34 — It'sNotALie., Jul 01 '13 at 15:34

Tim Schmelter · Accepted Answer · 2013-07-01T16:09:59.327

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 01 '13 at 16:09

answered Jul 01 '13 at 15:34

Tim Schmelter

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I have a feeling that is not what he's looking for. – It'sNotALie. Jul 01 '13 at 15:34
@newStackExchangeInstance: _" I want Index of ids2list Which are Common values in ids1list"_ – Tim Schmelter Jul 01 '13 at 15:37
3

I don't know how you can understand that :P – It'sNotALie. Jul 01 '13 at 15:38
3

@newStackExchangeInstance Speaking "New User" is an acquired skill. – Scott Chamberlain Jul 01 '13 at 16:13
@TimSchmelter It seems Very nice, I want to go through it, & I have a Doudbt on this. What is `IEnumerable` Can I use it as a `list`. Why because using theseindex I going to fetch Values from third `List`,Thanks. – Kumar Jul 01 '13 at 18:28
@kumar: you can use ToList() to create a List. – Tim Schmelter Jul 01 '13 at 18:41

Getting values using index in List C#

1 Answers1