Array to ref parameter

dedex · February 10th, 2005, 11:06 AM

i want pass an array[] in ref parameter:

this is my code
//=========================

ArrayList[] myArrayList = new ArrayList[256];
byte T;
int j;

for( j = 0; j < myArrayList .length; j++)

{
    // i have method with parameter ref
    myMethod(ref myArrayList [j]);
    // i want the loop process in myMethod
}

//=========================

i have massage error" a property or indexer may not be passed to an out or ref paramenter"how can i do ..

regards,
dede

miterviper · February 11th, 2005, 02:54 AM

Is it possible for you to pass the Array over and do the for loop in MyMethod ?

dedex · February 11th, 2005, 04:08 AM

myMethod can't change cause i get it from DLL windows,,

regards,
ivan

mehdi62b · February 11th, 2005, 02:22 PM

dedex,
you can't pass properteis or indexers to a ref parameter(however you can pass readonly properties),

Code:

void myMethod(ref myArrayList[j])
{
  ArrayList ar=new ArrayList();
  myArrayList[j]=ar;
}

if you set myArrayList[j] to a new object(ar) after you come out from the method,compiler can't assign new object(as type of Arraylist) to myArrayList[j] because its refrence is changed to a ArrayList Object,so C# compiler doesn't let this operation,
there is a solution for this explained here.

_____________
Mehdi.
software student.

mehdi62b · February 12th, 2005, 02:58 PM

and its solution was,(in this way you can make sure the reference(on stack) to your indexer would not be erased)

Code:

for( j = 0; j < myArrayList.length; j++)
{
    ArrayList temp=myArrayList [j];
    myMethod(ref temp);
    myArrayList[j]=temp;
}

just out of my curiosity,can you tell which windows function you were calling?

_____________
Mehdi.
software student.