检查空对象 [英] Check for null object
问题描述
大家好，
检查NULL对象的最佳/正确方法是什么？
即
myClass测试;
if（test == null）{}
这不起作用。
谢谢
Taz
Hi guys,
what is the best/correct way to check for a NULL object?
I.e.
myClass test;
if(test == null) {}
This doesnt work.
Thanks
Taz
推荐答案
你的意思是什么都行不通？这确实是确定
检查null的正确方法。
但是，我怀疑你收到编译错误告诉你
测试变量未初始化。你可能想先解决这个问题。
希望这会有所帮助。
-
- Nicholas Paldino [ .NET / C＃MVP]
- mv*@spam.guard.caspershouse.com
" Tarun Mistry" < no **** @ nospam.comwrote in message
news：％2 **************** @ TK2MSFTNGP06.phx.gbl ...
What do you mean it doesn''t work? That is indeed the correct way to
check for null.
However, I suspect you are getting a compiler error telling you that the
test variable is not initialized. You might want to fix that first.
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com
"Tarun Mistry" <no****@nospam.comwrote in message
news:%2****************@TK2MSFTNGP06.phx.gbl...
大家好，
检查NULL对象的最佳/正确方法是什么？
即
myClass测试;
if（test == null）{}
这不起作用。
谢谢
Taz
Hi guys,
what is the best/correct way to check for a NULL object?
I.e.
myClass test;
if(test == null) {}
This doesnt work.
Thanks
Taz
myClass test = new test（）;
test = null;
if（test == null）
{
System.Windows.Forms.MessageBox.Show（我是白痴）;
}
Tarun Mistry < no **** @ nospam.comwrote in message
news：％2 **************** @ TK2MSFTNGP06.phx.gbl ...
myClass test = new test();
test = null;
if(test == null)
{
System.Windows.Forms.MessageBox.Show("I am an idiot");
}
"Tarun Mistry" <no****@nospam.comwrote in message
news:%2****************@TK2MSFTNGP06.phx.gbl...
大家好，
检查NULL对象的最佳/正确方法是什么？
即
myClass测试;
if（test == null）{}
这不起作用。
谢谢
Taz
Hi guys,
what is the best/correct way to check for a NULL object?
I.e.
myClass test;
if(test == null) {}
This doesnt work.
Thanks
Taz
Tarun Mistry< no **** @ nospam.comwrote：
Tarun Mistry <no****@nospam.comwrote:
检查NULL对象的最佳/正确方法是什么？
what is the best/correct way to check for a NULL object?
轻微的术语澄清 - 没有空的
对象。一个*引用*可以为null，但是一个对象不能。
Slight terminology clarification - there''s no such thing as a null
object. A *reference* can be null, but an object can''t.
即
myClass test;
if（test == null）{}
这不起作用。
I.e.
myClass test;
if(test == null) {}
This doesnt work.
这正是你应该检查无效的方法。你能发一个
简短而完整的程序来证明这个问题吗？
见 http://www.pobox.com/~skeet/csharp/complete.html 了解详情
我的意思是什么。
-
Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet 博客： http://www.msmvps.com/jon.skeet
如果回复该组，请不要给我发邮件
That''s precisely how you should check for nullity. Could you post a
short but complete program which demonstrates the problem?
See http://www.pobox.com/~skeet/csharp/complete.html for details of
what I mean by that.
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
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