Question

I have a variable FirstThreads of type List<Thread>.

I am trying to do the following, but FirstThreads is always null.

FirstThreads.AddRange(Threads.Skip<Thread>(PageIndex * PageSize)
            .Take<Thread>(PageSize));

I can’t do this:

FirstThreads = FirstThreads.AddRange(Threads.Skip<Thread>(PageIndex * PageSize)
                                            .Take<Thread>(PageSize));

Do you have any idea how to solve this?

Answer 1

Before you can interact with the FirstThreads variable, you need to make the
variable refer to a List<Thread> instance, like this:

firstThreads = new List<Thread>();

You can also write

firstThreads = Threads.Skip<Thread>(PageIndex * PageSize).Take<Thread>(PageSize)