CODEWITHSUNDEEP
c#.net
Gohyu
Gohyu

Reputation: 478

C# - Error with variable in IF statement

Helloo, everyone. I have a problem with If statement. Where I'm wrong?

 int cnt = 0;
 int wayListNums;

 foreach (TableRow tr in allVisibleRows)
 {

   SPListItem itemAdd = wayList.Items.Add();

   if (cnt == 0) 
   {
      wayListNums = itemAdd.ID; 
   }      

   itemAdd["wayNum"] = "WayBill № " + " " + wayListNums;

   ...................

This is following error :

Error 1 Use of unassigned local variable 'wayListNums' ....

Upvotes: 2

Views: 344

Answers (5)

wildhawk
wildhawk

Reputation: 79

assigns a value to int

int wayListNums = 0;

Upvotes: 0

3615
3615

Reputation: 3877

The problem here is that wayListNums has no default value when it's declared. Later you are setting it's value only in if block, so if that if is not executed, the variable remains unassigned, like the error tells you.

So you have 2 options:

  1. Assign some value for wayListNums on declaration.

int wayListNums = 0;

  1. Assure, that every code branch will assign some value to the variable, before accessing it:

//code

if (cnt == 0) 
   {
      wayListNums = itemAdd.ID; 
   } 
 else
   {
      wayListNums = somethingElse;
   }

Upvotes: 2

usamazf
usamazf

Reputation: 3215

In C# and other similar languages the compiler expects the value of every variable to be initialized before it can be used. In your case the compiler is not sure if the value initilized within if-block will always be initialized and since you are using it outside the scope of this if-block the compiler simply gives you an error that value is not initialized. Simply setting

    int wayListNums  = 0;

will resolved the issue.

Upvotes: 0

sujith karivelil
sujith karivelil

Reputation: 29006

The compiler not sure about the values in the collection allVisibleRows sometimes it may be null or empty, (the variable get value only when the collection is non-empty as well as if (cnt == 0) evaluates to true.) In such situations the value of wayListNums is unknown. this is the reason for the warning. to overcome this issue, Initialize the variable before use:

int wayListNums=0;// or some other value

So that the default value will be used if other conditions failed.

Upvotes: 0

Dhara
Dhara

Reputation: 1972

You have to assigned default value to local variable..as error suggest it is unassigned.. here int wayListNums = 0;// because of int default value 0

Upvotes: 0

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