Beginner: Using array outside of switch's local scope

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Recently transitioned over from Java. I've initialized an array outside the local scope of my switch statement. However in each switch case I wish to populate the array in the case matched. For example:

C#

int[] Stment = {};
....Code
switch (level)
           {
               case 5:
                   Stment = new int[] { 5, 10, 15, 20 };
                   break;
               case 50:
                   Stment = new int[] { 50, 60, 70, 80};
                   break;
           }
           string disp = string.Join(Environment.NewLine, Stment);
           MessageBox.Show(disp);</pre>

Is there a way for me to use the populated array outside the switch's local scope?

Posted 28-Dec-15 11:02am

Dunks127

Updated 28-Dec-15 11:15am

v2

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Sergey Alexandrovich Kryukov 28-Dec-15 17:28pm

What do you mean "is there"? You are already doing it.
—SA

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OriginalGriff · Answer 1 · 2015-12-28T11:22:00

There are two ways: first is to assign a value took the variable when you define it.

int[] Stment = null;

Or

int[] Stment = new int[0];

Will do it.
Alternatively, add a default case to your switch block:

default: Stment = null;

Or

default: Stment = new int[0];

As long as the compiler can see any route through the code where the variable is not given a value before it is used, you will get that error - even if the logic actually prevents it happening.

Sergey Alexandrovich Kryukov · Answer 2 · 2015-12-28T11:28:00

As the variable Stment is declared outside the switch context, you can use it after it as well. (Despite horrific, unacceptably bad coding style shown in your sample. I hope it's only for example).

The only problem is how you tried to use it. System.String.Join expects second parameter of very different type, string[]. But this little problem has nothing to do with your question. I don't even know why would you need asking it; you could easily validate your code if you did something legitimate with your Stment object. Besides, simple logic should tell you that this is quite legitimate thing.

—SA

BillWoodruff · Answer 3 · 2015-12-28T20:50:00

Whatever you do, I suggest you test whether the result of the 'switch statement gave a valid result before executing any code that depends on a valid result::

C#

int[] Stment = null;

switch (level)
{
    case 5:
        Stment = new int[] {5, 10, 15, 20};
        break;
    case 50:
        Stment = new int[] {50, 60, 70, 80};
        break;
}

if (Stment == null)
{
    // throw an error ?
}
else
{
    string disp = string.Join(Environment.NewLine, Stment);
    MessageBox.Show(disp);
}

Beginner: Using array outside of switch's local scope

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