How to pass a ref/out variable to another class variable outside the function;

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How to store a ref/out variable for the class outside the function;
Consider the following code:

C#

class test
{
int data;
test(ref int orig)
{
this.data=orig;//this would pass the value of orig to data.
}
button1_Click(object sender, EventArgs e)
{
//here the value of orig has to be stored. Now if i do:
data=1;
// will 1 be passed to orig which is passed from another class?
}

but i want to store the orig's refernce in the class as this class is a form, and later on on a button click the value will be set in the orig. Now Button click event function has to set the value.

Posted 16-Feb-13 23:16pm

Ag_Sharad

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OriginalGriff · Answer 1 · 2013-02-16T23:29:00

No.
int is a value type, not a reference. So when you execute

C#

this.data = orig;

the value in orig is copied into data, not a reference to the original location. (References are not pointers, although they look like them most of the time).

If you rewrote your test method to go the other way:

C#

orig = this.data;

Then the value of orig in the calling method will be changed, but subsequent changes to data outside the test method will not change it.

Abhinav S · Answer 2 · 2013-02-16T23:35:00

Solution 2

Box the integer value.

Use object instead of int.
For e.g. object data;

This will pass the integer value around by reference but will require some type casting[^].

The other way would be to continue to pass the integer value (by reference) around using the ref parameter.

Posted 16-Feb-13 23:35pm

Abhinav S

Comments

Ag_Sharad 17-Feb-13 5:40am

i didn't get u clearly, if u could post some code......
but making int an object, will the class object variable will have the same ref, as of ref object passed as parameter.........