Sending 2 parameters back to Main function

问题

I got a function which wants to send 2 INT parameters back to where it has been called, but not sure what would be the best option, a Dictionary ? or a List or an Array

EDITED

I am using .Net framework 2

回答1:

I assume you mean return 2 values to the caller. If so:

return a Tuple<T1, T2>
return your own custom type which stores the desired values, like MyOperationResult
use out parameters: http://msdn.microsoft.com/en-us/library/t3c3bfhx(v=vs.80).aspx
return a collection

It depends on what is easiest for the caller to understand, i.e. what best demonstrates your intention?

Returning a variable-size collection may not be intuitive if the result will always have two values. My preference is either a Tuple or a custom type. A Tuple has the advantage of being an existing type, but the disadvantage that it's not clear what its members mean; they are just called "Item1", "Item2", and so on.

The out keyword is nice for operations which may not succeed and always return a bool, like public bool int.TryParse( string value, out int parsedValue ). Here the intent is clear.

回答2:

try with this code

type1 param1;
type2 param2;
void Send(out type1 param1, out type2 param2)

or

type1 param1 = ..;//You must initialize with ref
type2 param2 = ..;
void Send(ref type1 param1, ref type2 param2)

回答3:

You can try with out parameter msdn

回答4:

If you're only ever using two ints, then I'd use a 2-tuple, a Tuple<int, int>.

You can initialise it with its two values in the constructor:

return new Tuple<int,int>(val1, val2);

Alternatively for a variable number of outputs, a List<int> (or perhaps just an IEnumerable<int> depending on the intended use).

回答5:

i think i need to return it by refference, like so....

private void ReturnByRef(ref int i1, ref int i2) {

}

回答6:

Well, it depends, you'd have multiple ways to do that. If it's just two parameters you want to pass back, then you could just use "out" parameters:

class A
{
  private static void foo(int param, out int res1, out int res2)
  {
    res1 = 1*param;
    res2 = 2*param;
  }

  public static void main(string[] args)
  {
    int res1, res2;
    foo(1, out res1, out res2);
    // Do something with your results ...
  }

回答7:

out parameter works best

static void Main()
{
   int a;
   int b;
   someFunction(out a,out b); //the int values will be returned in a and b
   Console.WriteLine(a);
   Console.WriteLine(b);
}
public static void someFunction(out int x,out int y)
{
   x=10;
   y=20;
 }

your output wil be

10
20

来源：https://stackoverflow.com/questions/11737497/sending-2-parameters-back-to-main-function

标签

parameters

.net-2.0