Use of unassigned local variable Abstract classes

Asked Jun 29 '19 at 11:34

Active Jun 29 '19 at 11:59

Viewed 152 times

I'm learning C# and I need some help to understand variable scopes.

I have 3 different classes, 1 base class and 2 inherited. I want to define a function which creates a new instance of the inherited classes and return it.

My code so far:

class Base
{
    public Base(){}
}

class Divided1 : Base
{
    public Divided1(){}
}

class Divided2 : Base
{
    public Divided2(){}
}

private Base selectType()
{
    Base base;
    string type = Console.ReadLine();

    if (type == "1")
    {
        base = new Divided1();
    }
    else if (type == "2")
    {
        base = new Divided2();
    }

    return base;
}

I got an error

Use of unassigned local variable 'base'

I'm not sure why is it wrong.

edited Jun 29 '19 at 11:59

marc_s

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asked Jun 29 '19 at 11:34

Kristóf Varga

3

Hint: What happens if `type` isn't `"1"` and isn't `"2"`? – ProgrammingLlama Jun 29 '19 at 11:35
I'm implemented it, just didnt want to litter my example code. :) – Kristóf Varga Jun 29 '19 at 11:37
5

Explicitly assign it with null when declaring `Base base = null;` – CSDev Jun 29 '19 at 11:37
4

Well, it seems to me there's a code path where `base` never gets set, or else the compiler wouldn't be giving you this error. – ProgrammingLlama Jun 29 '19 at 11:38

Use of unassigned local variable Abstract classes

0 Answers0