Question

Can this code throw an exception?

public String[] GetPorts()
        {
       var sourceArray = Data;
        var array = new String[sourceArray.Count];
        for (int i = 0; i < array.Length; i++)
        {
            array[i] = Data[i][0];
        }
        return array;
}

Data is List<String[3]>

Answer 1

If Data can be changed from another thread, you’ve got a problem. For example, if Data‘s size may be changed during iteration, you may get IndexOutOfBoundException. Moreover, it’s possible that Data doesn’t support simultaneous reading and writing. (Writing may be done by other thread at the same time as you read it with the code you presented.)

You ought to protect Data with a mutex.

We could give you more information if we knew what data type is Data.

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According to MSDN, List<T> doesn’t support concurrent readers and writers. So you have to protect the Data if other code may write to it.