foreach on an object[]

William Stacey · Sep 29, 2003

Can you use a foreach to set the elements of an object[] to null? This does
not work as o is read-only. Is only way to use a for loop?

object[] buffer = new object[3];
//...fill buffer.
foreach (object o in buffer)
{
o = null;
}

Jeff · Sep 29, 2003

If it's a small array, you can also do this:

object[] buffer = {null, null, null};

--- Jeff

Jon Skeet · Sep 29, 2003

William Stacey said:
Can you use a foreach to set the elements of an object[] to null? This does
not work as o is read-only. Is only way to use a for loop?

object[] buffer = new object[3];
//...fill buffer.
foreach (object o in buffer)
{
o = null;
}

Even if o were not readonly, that would not change the buffer itself -
o is a local variable: changing its value wouldn't change the value of
anything else.

However, there's a much better way of doing this. I'm not sure whether
in your example, the //...fill buffer comment was saying that the
foreach was doing it, in which case it's unnecessary in the first
place, but if not, just use Array.Clear (buffer, 0, buffer.Length);

Leo Lin · Sep 29, 2003

I think the easist way is to create a new array
object[] buffer = new object[3];
//...fill buffer.
buffer = new object[3];

Stu Smith · Sep 30, 2003

Surely all you need to do is:

object[] buffer = new object[3];

....and you'll have an array of three object references, all of which are
null.

Leo Lin said:
I think the easist way is to create a new array
object[] buffer = new object[3];
//...fill buffer.
buffer = new object[3];

William Stacey said:

Can you use a foreach to set the elements of an object[] to null? This does
not work as o is read-only. Is only way to use a for loop?

object[] buffer = new object[3];
//...fill buffer.
foreach (object o in buffer)
{
o = null;
}

Click to expand...

Humanity · Sep 30, 2003

You can do that for large arrays too, Jeff!
AHAHAHAHAHAHAHAHAHAHAHA
HAHAHAHAHAHAHAHAHAHAHAH
AHAHAHAHAHAHAHAHAAHAHAH
AHAHAHAHAHAHAAHAHA... *crack*

Jeff said:
If it's a small array, you can also do this:

object[] buffer = {null, null, null};

--- Jeff

William Stacey said:

Can you use a foreach to set the elements of an object[] to null? This does
not work as o is read-only. Is only way to use a for loop?

object[] buffer = new object[3];
//...fill buffer.
foreach (object o in buffer)
{
o = null;
}

Click to expand...

Jeff · Sep 30, 2003

True, but who wants to code something like:

object[] buffer = {null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null};

:-)

Humanity said:
You can do that for large arrays too, Jeff!
AHAHAHAHAHAHAHAHAHAHAHA
HAHAHAHAHAHAHAHAHAHAHAH
AHAHAHAHAHAHAHAHAAHAHAH
AHAHAHAHAHAHAAHAHA... *crack*

Jeff said:

If it's a small array, you can also do this:

object[] buffer = {null, null, null};

--- Jeff

William Stacey said:

Can you use a foreach to set the elements of an object[] to null?

Click to expand...

This
does

not work as o is read-only. Is only way to use a for loop?

object[] buffer = new object[3];
//...fill buffer.
foreach (object o in buffer)
{
o = null;
}

Click to expand...

Click to expand...

William Stacey · Sep 30, 2003

Allocating new arrays is not always the right design choice (even thou it is
easy), especially in loops when you would need to make many allocations
(i.e. streams, network objects, etc.) and could reuse the array.

--
William Stacey

Stu Smith said:
Surely all you need to do is:

object[] buffer = new object[3];

...and you'll have an array of three object references, all of which are
null.

Leo Lin said:

I think the easist way is to create a new array
object[] buffer = new object[3];
//...fill buffer.
buffer = new object[3];

William Stacey said:

Can you use a foreach to set the elements of an object[] to null?

Click to expand...

This
does

not work as o is read-only. Is only way to use a for loop?

object[] buffer = new object[3];
//...fill buffer.
foreach (object o in buffer)
{
o = null;
}

Click to expand...

Click to expand...

Humanity · Oct 1, 2003

Certainly not me!
I see your point

Jeff said:
True, but who wants to code something like:

object[] buffer = {null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null, null, null, null, null, null, null, null,
null, null, null, null, null};

Humanity said:

You can do that for large arrays too, Jeff!
AHAHAHAHAHAHAHAHAHAHAHA
HAHAHAHAHAHAHAHAHAHAHAH
AHAHAHAHAHAHAHAHAAHAHAH
AHAHAHAHAHAHAAHAHA... *crack*

Jeff said:

If it's a small array, you can also do this:

object[] buffer = {null, null, null};

--- Jeff

Can you use a foreach to set the elements of an object[] to null? This
does
not work as o is read-only. Is only way to use a for loop?

object[] buffer = new object[3];
//...fill buffer.
foreach (object o in buffer)
{
o = null;
}

Click to expand...

Click to expand...

Jeffrey Tan[MSFT] · Oct 2, 2003

Hi William,

Yes, foreach statement does not allow the user to change the value in the
array.
I think you can initialize the array like this:

object[] buffer = new object[3];
for(int i=0;i<buffer.Length ;i++)
{
buffer=null;
}

Hope this helps,
Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.

--------------------
| From: "William Stacey" <[email protected]>
| Subject: foreach on an object[]
| Date: Mon, 29 Sep 2003 11:49:20 -0400
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|
| Can you use a foreach to set the elements of an object[] to null? This
does
| not work as o is read-only. Is only way to use a for loop?
|
| object[] buffer = new object[3];
| //...fill buffer.
| foreach (object o in buffer)
| {
| o = null;
| }
|
| --
| William Stacey
|
|
|
|

William Stacey · Oct 2, 2003

Thanks Jeff.

foreach on an object[]

William Stacey

Jeff

Jon Skeet

Leo Lin

Stu Smith

Humanity

Jeff

William Stacey

Humanity

Jeffrey Tan[MSFT]

William Stacey