Access variable inside while loop from outside (C#)?

问题

I'm New to C# and I'm trying to reach the value of MAX from the while so i can use it outside but i can't...anyone have some ideas !!! Thanks In Advance

while (Condition)
{    
    Double MAX = somecode.....
                         .....
}

Console.WriteLine("The OPTIMAL Value : " + MAX);

回答1:

Declare MAX before you start the while loop. The way you have it you can only access within the while.

Double MAX = 0;
while (Condition)
            {    

                MAX = somecode.....
                                      .....
            }

            Console.WriteLine("The OPTIMAL Value : " + MAX);

回答2:

You must declare the variable BEFORE the loop.

Double MAX;
while (Condition)
{
    MAX = somecode....
}
Console.WriteLine("The OPTIMAL Value : " + MAX);

回答3:

It would seem the underlying problem is understanding how scope works. A google search for "C# how scope works" (or similar) might prove helpful.

I found one that's quite simple and easy to understand: http://www.codecandle.com/Articles/191/Csharp/Variables/Variable-scope/codedetail.aspx

So as many others have mentioned you'll need to declare your variable outside your inner scope in order to have access to the changes.

Some pseudo code

// declare variable;
{
  // change variable;
}
// use changed variable

回答4:

Declare MAX as a variable outside of the loop for example change the variable name also don't use reserved words as variable names

var dMax = default(double);//this is equivalent to writing Double dMax = 0 when debugginb it will give you this value 0.0

while (Condition)
{    
    dMax = somecode.....
}
Console.WriteLine("The OPTIMAL Value : " + dMax);

来源：https://stackoverflow.com/questions/15593540/access-variable-inside-while-loop-from-outside-c

标签

while-loop