CODEWITHSUNDEEP
c#wpfforeachiteration
user3821183
user3821183

Reputation: 35

How to judge if FOREACH iteration variable is null?

I have a foreach loop.

foreach(var item in dataGrid)
        {


        }

I need to judge if "item" is null, because when the item is null, i get a NullReferenceException. NOTE: my purpose is not to judge "dataGrid", because for some reasons, this "dataGrid" in my program is never null (its value is 1 when it is actually null or 1), but "item" can be null when "dataGrid" is acutally null.

The actual question - How to judge whether item is null?

Upvotes: 0

Views: 198

Answers (3)

nestedloop
nestedloop

Reputation: 2646

foreach(var item in dataGrid)
    {
        if(item == null) continue;

        // do your work here...
    }

Upvotes: 1

Selman Genç
Selman Genç

Reputation: 101681

You can eliminate null items using Where:

foreach(var item in dataGrid.Where(x => x != null))

Upvotes: 6

Maarten
Maarten

Reputation: 22945

You can simply check it using an IF statement inside the for each loop.

foreach(var item in dataGrid) {
    if (item == null) {
        // Do something, throw exception, continue, whatever...
    } else {
        // Do something useful with item...
    }
}

Upvotes: 0

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