c# dictionary ObjectReference not set

Question

Why does this code return a NullReferenceExeption on the first if statement? How should it be remedied?

void Main()
{
    addOrIncrement(new KeyValuePair<string,long>("1",1));
    addOrIncrement(new KeyValuePair<string,long>("1",1));
}

public Dictionary<string, long> Result { get; set; }

public void addOrIncrement(KeyValuePair<string,long> pair){
    if(Result.ContainsKey(pair.Key))
    {
        Result[pair.Key] += pair.Value;
    } else {
        Result.Add(pair.Key, pair.Value);
    }
}

oerkelens · Accepted Answer · 2020-03-28 12:33:06Z

2

Result is never initialised, so it's null

public Dictionary<string, long> Result { get; set; } = new Dictionary<string, long>();

Should do the trick

answered Mar 28, 2020 at 12:33

oerkelens

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1 Comment

gorgabal Over a year ago

wow, my head is not working today apparently. How did I miss that?

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