LINQ to Object Basic

Question

I have following codes (I am a beginner);

string myVar = "abcd";
var myQuery = from x in myVar select x;     
MessageBox.Show( string.Join("\n", myQuery));

I'd like to have the result like this;

1 a
2 b
3 c
4 d

Some hints please.

Thanks.

Jason, Is this a school work / homework issue? If so, I'd like to recommend that you first do it without linq, so that you understand what's going on behind the scenes. — Joe
– Joe, Commented Feb 19, 2016 at 15:40
@Joe ..Thanks for good tip. I can handle it without LINQ. Now I'm at chap 8 "LINQ" of Albabari brothers. (I found the second argument at Pg.385 but it lacks "it is Fluent-syntax only"). — Jason
– Jason, Commented Feb 19, 2016 at 15:57

Sergey Berezovskiy · Accepted Answer · 2016-02-19 15:51:05Z

8

You should use Select operator overload which accepts index of item. (unfortunately it's not available in query syntax):

String.Concat(myVar.Select((ch,i) => $"{i + 1} {ch}\n"))

Update: @Mattew correctly noticed that this code will add extra \n at the end. If it's not good, then you should use String.Join instead. Also consider to use Environment.NewLine thus for windows platform new line string is \r\n:

String.Join(Environment.NewLine, myVar.Select((ch,i) => $"{i + 1} {ch}"))

edited Feb 19, 2016 at 15:51

answered Feb 19, 2016 at 15:33

Sergey Berezovskiy

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8 Comments

Jason Over a year ago

Wow. so simple. Second argument... OK. I will check it out right now. Thanks.

Jason Over a year ago

I added number 1 "(i + 1)". Works like a charm. Thanks again.

Matthew Whited Over a year ago

As a note this would add an extra line fee at the end compared to OPs example.

Sergey Berezovskiy Over a year ago

@MatthewWhited nice catch, then String.Join is better here. I just tried to make code more compact. Thanks)

Matthew Whited Over a year ago

string.Join("\n", myVar.Select((ch,i) => $"{i + 1} {ch}")) would resolve the extra line fee (if it matters ;)

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