Object Reference Not Set whereclause

Question

I am getting an object reference not set even though I am creating a new instance of a list any ideas as to why.

 List<QueryCritera> whereClause = new List<QueryCritera>();
 whereClause=viewConfig.WhereClause;

 foreach (QueryCritera condishion in whereClause)
 {
    string filedname = condishion.fieldName;
    string fieldValue = condishion.Rightvalue;
    string operation = condishion.Operation;
 }

`new List();` is useless, since you're reassigning the list to something else immediately after. — Dennis_E, Jul 08 '14 at 08:29
it won't cause an error but it's "condition" not "condishion". Code checking tools will show this up. — Lee Willis, Jul 08 '14 at 08:31

score 1 · Answer 1 · answered Jul 08 '14 at 08:26

1

Your ViewConfig must be null

if(viewConfig != null)
{
   whereClause=viewConfig.WhereClause;
}

answered Jul 08 '14 at 08:26

Sajeetharan

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Not necessarily. `viewConfig` could be null, `viewConfig.WhereClause` could be null, or the `viewConfig.WhereClause` list could be *not* null but contain null values. We don't know which, because the OP didn't say in which line the error occurred. He'll have to debug his code. – dcastro Jul 08 '14 at 08:36

Christos · Answer 2 · 2014-07-08T08:42:49.457

1

Your problem is something of the below:

the viewConfig is null
the viewConfig.WhereClause is null.
the viewConfig.WhereClause is not null but contains null values.

In order you find out what of the above is true and act correspondingly, you should debug your code.

though I am creating a new instance of a list

That's true, you create an empty list of QueryCritera objects. However, later you assign to the variable that holds this list, whereClause, the viewConfig.WhereClause, for which something of the things that mentioned above is true and causes the problem.

edited Jul 08 '14 at 08:42

answered Jul 08 '14 at 08:26

Christos

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Not necessarily. `viewConfig` could be null, `viewConfig.WhereClause` could be null, or the `viewConfig.WhereClause` list could be *not* null but contain null values. We don't know which, because the OP didn't say in which line the error occurred. He'll have to debug his code. – dcastro Jul 08 '14 at 08:37
@dcastro thank you for you comment ! I will update my answer correspondingly. – Christos Jul 08 '14 at 08:38

Object Reference Not Set whereclause

2 Answers2