Array: "Index was outside the bounds of the array"

Question

I get the following error on my web application: "Index was outside the bounds of the array."

The strange thing is, that the problem only comes on my webserver (Windows Server 2008 R2, .Net 4.0, Windows 7 Enterprise 64 Bit).

When I debug the site in Visual Studio, it all works perfect

The Code looks like this:

I define an array and give it to the class "CheckUserRights"

string NTLogin = Page.User.Identity.Name.ToString().Split(new char[] { '\\' })[1].ToUpper();
string[] allowedRoles = new string[2] { "Administrator", "Superuser" };
CheckUserRights Check = new CheckUserRights(NTLogin, allowedRoles);

The class looks like this:

//Lokale Variablen definieren
string strUserName;
string strRolename;
string[] AllowedRoles;
bool boolAuthorized;

//Im Konstruktor definierte Werte übergeben.
public CheckUserRights(string Username, string[] Roles)
{
    this.strUserName = Username;
    this.AllowedRoles = Roles;
    getRoleForUser();
    checkRights();
}
...
...

I have searched for a solution after 4 hours, but I can't find anything. I am not a pro and that's the first time I have used arrays.

Could it be a wrong configuration on the server?

I am grateful for every help. Thanks!

Update

Solved, there was an problem in the server configuration. Solution is in the answer from Steve.

Solution 1

There are many problems in that code, but, sticking to the problem on the question title I think that this line looks suspicious:

string NTLogin = Page.User.Identity.Name.ToString().Split(new char[] { '\\' })[1].ToUpper();  

what happen if the Page.User.Identity.Name doesn't contain a DOMAIN\USERNAME?

Could be rewritten as

string[] nameparts = Page.User.Identity.Name.ToString().Split(new char[] { '\\' });
string NTLogin = (nameparts.Length == 2 ? nameparts[1] : nameparts[0]).ToUpper();
if(NTLogin.Length == 0)
    return;            

Why this property could be the error? Look at this article

Solution 2

1) Your code is vulnerable to a SQL injection attack on the first select in getRoleForUser. You should use a SqlParameter.

2) without a stack trace it makes it difficult to determine where the error is. However, I think it maybe that the sql selects could return NO ROWS. So, whenever you do a r.Read, change it to if (!r.Read()) return;.

Again, if you post the stack trace we can be of better help.