Field initialization cannot reference non-static field? How to work around it?

Asked Mar 13 '20 at 01:59

Active Mar 13 '20 at 02:04

Viewed 16 times

I'm referring to some code from the book [C# concurrency in action], the chapter has following code snippet:

int _v1;
readonly Lazy<int> Myv1 = new Lazy<int>(() => _v1++);//error
void UseV1()
{
    Console.WriteLine(Myv1.Value);
}

int _v2;
readonly Lazy<Task<int>> Myv2 = new Lazy<Task<int>>(async () =>//error
{
    await Task.Delay(2).ConfigureAwait(false);
    return _v2++;
});

It doesn't compile, saying that

error CS0236: A field initializer cannot reference the non-static field, method, or property 'Program._v1'

Why this rule happens, how to fix or get around this problem? Thanks a lot.

edited Mar 13 '20 at 02:04

ProgrammingLlama

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asked Mar 13 '20 at 01:59

Troskyvs

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1

Initialize it in the constructor? – ProgrammingLlama Mar 13 '20 at 02:02
1

What @John said * 2 – TheGeneral Mar 13 '20 at 02:04
1

Also you might want to have a look at this https://blog.stephencleary.com/2012/08/asynchronous-lazy-initialization.html – TheGeneral Mar 13 '20 at 02:05
Is the code in the book error-prone? – Troskyvs Mar 13 '20 at 02:08
If that's exactly as it's printed, then I'd say yes, unless the book goes on to explain why this doesn't work. – ProgrammingLlama Mar 13 '20 at 02:08

Field initialization cannot reference non-static field? How to work around it?

0 Answers0