C# Index Out of Range

Question

I am Learning c#. I am trying to get the displayName from AD. Here is the code for the following.

if ( resEnt.Properties["displayname"].Count > 0)
{
    nameList = new List<string>();
    name = resEnt.Properties["displayname"][0].ToString();
    nameList.Add(name.ToString());
    int count = nameList.Count;
    Console.WriteLine("name: " + resEnt.Properties["displayname"][0].ToString());

    comboBox1.Items.Add(name.ToString());
 }

The error i am getting is

Index was out of range. Must be non-negative and less than the size of the collection.

on the line

 name = resEnt.Properties["displayname"][0].ToString();

`resEnt.Properties["displayname"][0]` its really on the line above, have you initialized this? — Sayse, Aug 28 '14 at 06:56
Which line is your error? What is `resEnt.Properties["displayname"]` ? — kelsier, Aug 28 '14 at 06:56
name = resEnt.Properties["displayname"][0].ToString();Index was out of range. Must be non-negative and less than the size of the collection. — user3200722, Aug 28 '14 at 06:58
@user3200722 it's just impossible to have exception on line you pointed. You don't access any collection by index there — Sergey Berezovskiy, Aug 28 '14 at 07:03
Seems like all you want to do is something like `var firstItem = resEnt.Properties["displayname"].FirstOrDefault(); var name = firstItem == null ? null : firstItem.ToString(); if (string.IsNullOrWhiteSpace(name) == false) { comboBox1.Items.Add(name); }`. — Corak, Aug 28 '14 at 07:10

score 0 · Answer 1 · answered Aug 28 '14 at 07:14

0

Maybe resEnt.Properties["displayname"][0] is null? Anyway, what is resEnt? is it of type DirectoryEntry? if so, you should try resEnt.Properties["displayname"].Value.ToString()

answered Aug 28 '14 at 07:14

eyalfein

48
1
5

resEnt is DirectorySearcher. – user3200722 Aug 28 '14 at 07:20
if resEnt is DirectorySearcher, then resEnt.Properties is a syntax error. (.Net 4, maybe I'm lagging behind?) – eyalfein Aug 28 '14 at 07:35

C# Index Out of Range

1 Answers1