foreach on a object [] [英] foreach on an object[]

问题描述

你能用foreach将对象[]的元素设置为null吗？这是因为o是只读的，所以
不起作用。是否只能使用for循环？


object [] buffer = new object [3];

//...fill buffer。

foreach（缓冲区中的对象o）

{

o = null;

}


-

William Stacey

解决方案

如果它是一个小阵列，你也可以这样做：


object [] buffer = {null，null，null};


--- Jeff


" William Stacey" < ST ***** @ mvps.org>在消息中写道

新闻：uy ************* @ TK2MSFTNGP10.phx.gbl ...

你能用foreach来将对象[]的元素设置为null？这个
不起作用，因为o是只读的。是否只能使用for循环？

object [] buffer = new object [3];
//...fill buffer。
foreach（缓冲区中的对象o） ）
{
o = null;
}

- William Stacey

William Stacey< st ***** @ mvps.org>写道：

你能使用foreach将对象[]的元素设置为null吗？由于o是只读的，因此无法正常工作。是否只能使用for循环？

object [] buffer = new object [3];
//...fill buffer。
foreach（缓冲区中的对象o） ）
{
o = null;
}

即使o不是readonly，也不会改变缓冲区本身 -

o是一个局部变量：改变它的值不会改变

的价值。


然而，那里这是一个更好的方法。我不确定在你的例子中是否

，// ..填充缓冲区评论说

foreach正在这样做，在这种情况下它'在第一个

位置是不必要的，但如果没有，只需使用Array.Clear（buffer，0，buffer.Length）;


-

Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet

如果回复小组，请不要给我发邮件

我认为最简单的方法是创建一个新数组

object [] buffer = new object [3];

//...fill buffer 。

buffer = new object [3];


" William Stacey" < ST ***** @ mvps.org>在消息中写道

新闻：uy ************* @ TK2MSFTNGP10.phx.gbl ...

你能用foreach来将对象[]的元素设置为null？这个
不起作用，因为o是只读的。是否只能使用for循环？

object [] buffer = new object [3];
//...fill buffer。
foreach（缓冲区中的对象o） ）
{
o = null;
}

- William Stacey

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

解决方案

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

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

--- Jeff

"William Stacey" <st*****@mvps.org> wrote in message
news:uy*************@TK2MSFTNGP10.phx.gbl...

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 <st*****@mvps.org> wrote:

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);

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

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

"William Stacey" <st*****@mvps.org> wrote in message
news:uy*************@TK2MSFTNGP10.phx.gbl...

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

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