通过==比较两个结构 [英] compare two structs via ==
问题描述
我希望通过==比较两个结构，但它不能编译。我可以
重载并创建我自己的==但是我错过了一些c＃
已经实现了吗？
~titan
I wish to compare two structs via == but it does not compile. I can
overload and create my own == but am I missing something that c#
already has implemented?
~titan
推荐答案
不，你没有。如果你重载==，那么你必须超载！= as
well。
除此之外，你还应该重载Equals和GetHashCode
产生一致的结果。
-
- Nicholas Paldino [.NET / C＃MVP]
- mv*@spam.guard.caspershouse.com
" titan nyquist" < ti *********** @ gmail.com写信息
新闻：11 ******************* ***@z28g2000prd.googlegr oups.com ...
No, you have not. If you overload ==, then you have to overload != as
well.
On top of that, you should also overload Equals and GetHashCode as well
to produce consistent results.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com
"titan nyquist" <ti***********@gmail.comwrote in message
news:11**********************@z28g2000prd.googlegr oups.com...
>我希望通过==比较两个结构，但它不能编译。我可以
重载并创建我自己的==但是我错过了一些c＃
已经实现了吗？
~titan
>I wish to compare two structs via == but it does not compile. I can
overload and create my own == but am I missing something that c#
already has implemented?
~titan
titan nyquist写道：
titan nyquist wrote:
我想比较两个结构==但它不编译。我可以
重载并创建我自己的==但是我错过了一些c＃
已经实现了吗？
I wish to compare two structs via == but it does not compile. I can
overload and create my own == but am I missing something that c#
already has implemented?
结构没有默认的比较器，因为比较这些值作为一个二进制数据块并不总是有意义的。
如果你有一个结构：
public struct MyStruct {
private string _name;
public MyStruct（string name）{_ name = name; } $ / $
public string Name {get {return _name; } $
}
如果然后创建两个包含相同字符串值的结构值：
MyStruct v1 = new MyStruct（1）;
MyStruct v2 = new MyStruct（1.ToString（））;
如果可以比较这些结构作为二进制数据块的值，它们将不等于
，因为结构包含两个不同的引用，
尽管引用指向相等的字符串值。
-
G？跑Andersson
_____
http://www.guffa.com
" G？ran Andersson" < gu *** @ guffa.comha scritto nel messaggio
新闻：O7 ************** @ TK2MSFTNGP06.phx.gbl ...
"G?ran Andersson" <gu***@guffa.comha scritto nel messaggio
news:O7**************@TK2MSFTNGP06.phx.gbl...
>
没有结构的默认比较器，因为将这些值作为
二进制数据块进行比较总是有意义的。
>
There is no default comparer for structs, as comparing the values as a
binary block of data doesn''t always make sense.
但为什么我能做到这一点？
点p1 =新点（1， 2）;
点p2 =新点（1,2）;
Console.WriteLine（p1 == p2）;
But why I can do this?
Point p1 = new Point(1, 2);
Point p2 = new Point(1, 2);
Console.WriteLine(p1 == p2);
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