why not returning any value from the list?

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Hello Sir,

I have a list cities of List with "India","Delhi", "Bombay" and etc. I using Where linq over the list like,

C#

var r=cities.Where(x=>x.Length>2);

but in the r I can't see any value at all.

Please help me.

aaron

Posted 14-May-12 12:32pm

(__Aaron__)

Updated 14-May-12 18:32pm

Wendelius

v2

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4 solutions

Solution 4

var r=cities.Where(x=>x.Length>2).ToList();

To do so,you can see any value .

Posted 14-May-12 20:13pm

cdxialove

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Sergey Alexandrovich Kryukov · Accepted Answer · 2012-05-14T12:48:00

I tested your example. What was the first line? In this case, it works:

C#

string[] cities = new string[] { "Dehli", "Bombay", }; // could be a list as well
var longNames = cities.Where(x => x.Length > 2); // your LINQ is correct

Both cities satisfy the condition, so, the both appear in the result longNames. Maybe, you just failed to see it? This is the iterator, so do this, for example:

C#

foreach (string name in longNames)
    System.Console.WriteLine(name);

It will print both names.

Next time, use Visual Studio Debugger, Watch (or QuickWatch) to quickly find ends.

Good luck,

—SA

Mohammad A Rahman · Accepted Answer · 2012-05-14T13:19:00

Solution 3

In addition to Solution 1 & 2, due to the Deferred execution there is nothing in the r until we call the iterator. Please read more here[^]. And also you could read How does it work in C#? - Part 3 (C# Linq in detail)[^]

Hope it helps :)

Posted 14-May-12 13:19pm

Mohammad A Rahman

Comments

(__Aaron__) 14-May-12 20:07pm

nice link. thanks.

Sergey Alexandrovich Kryukov 14-May-12 20:08pm

Useful piece of documentation and an interesting article referenced, a 5.
--SA

Mohammad A Rahman 14-May-12 20:11pm

Thank you SA :)

VJ Reddy 14-May-12 20:57pm

Good answer with useful reference. 5!

Clifford Nelson · Accepted Answer · 2012-05-14T12:50:00

Solution 2

The problem is not in your LINQ statement. The following works:

C#

var list = new string[] { "India", "Delhi", "Bombay" };
var r = list.Where(x => x.Length > 2);
Console.Write("Number of cities found: " + r.Count());

Posted 14-May-12 12:50pm

Clifford Nelson

Comments

Mohammad A Rahman 14-May-12 19:29pm

Good answer :)

VJ Reddy 14-May-12 20:57pm

Good answer. 5!