Question

I have the following code:

DataGridModel[] raport = new DataGridModel[100];
... // more code here, nothing relevant
raport[i].populate(param1,param2); // NullReferenceException occurs here

My DataGridModel class has an empty constructor, so nothing is really done there.

When I watch the raport variable, it contains 100 times null, but why? Cause I initialized it with new DataGridModel[100].

If I lose the array of objects in the first line (so only 1 instance), the code works great.

I don’t get it why they are null. Any help?

Answer 1

You initialized it with new DataGridModel[100], which creates an instance — but it’s an instance of an array that contains 100 null elements.

I’m not sure what you mean by raport.populate – I suppose it’s an extension method? – but here’s how you can solve your problem:

DataGridModel[] raport = new DataGridModel[100];

for(int i = 0; i < raport.Length; i++) {
    raport[i] = new DataGridModel();
}

// ...

raport.populate(param1, param2);