Baseless error in code

Question

1.00/5 (2 votes)

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I have written simple code, I am pretty sure there is no mistake but compiler says it is.
Here is all code.

@{Layout="_Layout.cshtml";
  var authenticated= WebSecurity.IsAuthenticated;
 
 if(authenticated)
{ 
 var db = Database.Open("aaa");
 var user = db.QuerySingle("SELECT * FROM UserProfile WHERE UserId=@0",WebSecurity.CurrentUserId);
 Array userData = File.ReadAllLines(Server.MapPath("~/App_Data/"+user.Group)); 
 } 
  }



@if(authenticated)
{
foreach (string dataLine in userData) 
{
  foreach (string dataItem in dataLine.Split(',')) 
  {@dataItem <text> </text>}
  <br />

}
}

and error

Compiler Error Message: CS0103: The name 'userData' does not exist in the current context

Source Error:


Line 14: @if(authenticated)
Line 15: {
Line 16: foreach (string dataLine in userData) 
Line 17: {
Line 18:   foreach (string dataItem in dataLine.Split(','))

Thanks. :)

Posted 5-Aug-13 11:39am

wirec aaht

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Comments

jkirkerx 5-Aug-13 17:42pm

I see user but not userData, but I'm not familiar with the language

var user = db.QuerySingle("SELECT * FROM UserProfile WHERE

I think you need a snickers bar

wirec aaht 5-Aug-13 17:48pm

under variable user it is

Richard C Bishop 5-Aug-13 17:55pm

What language is that?

2 solutions

Solution 1

You need to declare userData outside of the current scope; i.e declare it at the top, outside of the curly braces.

Posted 5-Aug-13 11:58am

R. Giskard Reventlov

Comments

wirec aaht 5-Aug-13 18:05pm

I updated it to this :
@{Layout="_Layout.cshtml";
var authenticated= WebSecurity.IsAuthenticated;
Array userData;
if(authenticated)
{
var db = Database.Open("Cosa Nostra Tips");
var user = db.QuerySingle("SELECT * FROM UserProfile WHERE UserId=@0",WebSecurity.CurrentUserId);
userData = File.ReadAllLines(Server.MapPath("~/App_Data/"+user.Group));
}
}

@if(authenticated)
{
foreach (string dataLine in userData)
{
foreach (string dataItem in dataLine.Split(','))
{@dataItem <text> }
<br />

}
}
but it gives me error :
Compiler Error Message: CS0165: Use of unassigned local variable 'userData'

Source Error:

Line 14: @if(authenticated)
Line 15: {
Line 16: foreach (string dataLine in userData)
Line 17: {

which I dont understand is if condition is true userData should have value and also code should perfrom if its not than not.

R. Giskard Reventlov 5-Aug-13 18:12pm

Declare it with an initial value.
http://msdn.microsoft.com/en-us/library/system.array.aspx

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-08-05T12:03:00

Compiler is correct, you are wrong. The error is in the second fragment of code: foreach (string dataLine in userData) … Here, userData is not declared. If, by some weird reason. you think that having Array userData mentioned above makes any difference, you are wrong: this is the declaration of the stack (local) variable, which only exist in the current stack frame, where it was declared.

Moreover, calculating the userData object you show makes no sense at all: when you go out of context (enclosing '{… }' pair), this object becomes unreachable and eventually gets destroyed by the Garbage Collection. To understand it, please see:
http://en.wikipedia.org/wiki/Garbage_collection_%28computer_science%29[^].

—SA