blocks|key|68340|text|使用class，除非您有非常具体的理由使用struct。由于一些特定的原因，请参阅Questions+about+Structs。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|68341|编辑：与class相比，struct的一个可能的优点是您永远不能拥有null实例。请参阅Is+there+a+way+to+require+that+an+argument+provided+to+a+method+is+not+null?|BOLD|68342|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/667285/questions-about-structs|1|https://stackoverflow.com/questions/754330/is-there-a-way-to-require-that-an-argument-provided-to-a-method-is-not-null/^0|2|5|L|6|15|N|0|0|0|3|4|5|C|6|Y|4|18|24|1|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|6|7|10|8|@$9|11|A|12|B|H]|$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@$9|19|A|1A|1|1B]]|E|$]]|$1|I|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]]|J|$K|$5|L|M|N|E|$O|P]]|Q|$5|L|M|N|E|$O|R]]]]

Use a <code>class</code> unless you've got very specific reasons to use a <code>struct</code>. See <a href="https://stackoverflow.com/questions/667285/questions-about-structs">Questions about Structs</a> for some of the specific reasons.

Edit: One of the possible advantages to a <code>struct</code> over a <code>class</code> is that you can't ever have <code>null</code> instances. See <a href="https://stackoverflow.com/questions/754330/is-there-a-way-to-require-that-an-argument-provided-to-a-method-is-not-null/">Is there a way to require that an argument provided to a method is not null?</a>

blocks|key|520608|text|我更喜欢上课。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|520609|Structure+TestStruct
++++Dim+Name+as+String
End+Structure

Dim+x+as+TestStruct

If+x+Is+Nothing+Then+
'ALWAYS+returns+false.+A+class+would+return+true.+Nullability,+baby.|code-block|syntax|javascript|520610|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I prefer Classes.

<pre><code>Structure TestStruct
 Dim Name as String
End Structure

Dim x as TestStruct

If x Is Nothing Then 
'ALWAYS returns false. A class would return true. Nullability, baby.
</code></pre>

blocks|key|68374|text|我给你找到了这一页。它解释了在哪里使用一种或另一种，每一个的好处和缺点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|68375|http://www.jaggersoft.com/pubs/StructsVsClasses.htm|offset|length|68376|你好！|68377|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1F|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@$D|Q|E|R|1|S]]|A|$]]|$1|F|3|G|5|6|7|T|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|C]]]]

I found this page for you. It explains where to use one or the other, the benefits and drawbacks of each one.

<a href="http://www.jaggersoft.com/pubs/StructsVsClasses.htm" rel="nofollow noreferrer">http://www.jaggersoft.com/pubs/StructsVsClasses.htm</a>

Regards!!!

blocks|key|524351|text|非常基本的指导方针，甚至不是特定于.NET的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|524352|除了需要非常小、非常简单的容器之外，所有东西都要使用类。如果不需要属性或函数，则应该使用类。|524353|在我看来，结构体的一个很好的例子是当您需要创建一个条目数组时，但是这些项是一个int和string的“对”。一些基本的，类似的|524354|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Very basic guideline, and not even .NET specific:

Use CLASS for everything except when you need very small, very simple container.
if you don't want properties nor functions, you should use a class.

a good example in my opinion for a struct is when you need to make an array of items, but the items is a "pair" of int and string. 
something basic like that

blocks|key|35270|text|引用a+good+answer+to+the+same+question+(When+should+I+use+a+struct+instead+of+a+class?)：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|35271|35272|+MSDN有答案：Choosing+Between+++Classes+and+Structures.|blockquote|35273|35274|基本上，这一页给你一个4项清单，并说使用一个类，除非你的类型符合所有的条件。|35275|除非类型具有下列所有特征，否则不要定义结构：|35276|35277|35278|它逻辑上表示一个值，类似于原语类型(整数、双等)。|unordered-list-item|35279|它的实例大小小于16字节。|35280|35281|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/85553/when-should-i-use-a-struct-instead-of-a-class/85656#85656|1|https://stackoverflow.com/questions/85553/when-should-i-use-a-struct-instead-of-a-class/85656|2|http://msdn.microsoft.com/en-us/library/ms229017.aspx^0|2|Y|0|12|1A|1|0|0|9|16|2|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]|$A|1A|B|1B|1|1C]]|C|$]]|$1|D|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|1E|8|@]|9|@$A|1F|B|1G|1|1H]]|C|$]]|$1|H|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]|$1|I|3|J|5|6|7|1J|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|1K|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|1L|8|@]|9|@]|C|$]]|$1|N|3|-4|5|6|7|1M|8|@]|9|@]|C|$]]|$1|O|3|P|5|Q|7|1N|8|@]|9|@]|C|$]]|$1|R|3|S|5|Q|7|1O|8|@]|9|@]|C|$]]|$1|T|3|-4|5|6|7|1P|8|@]|9|@]|C|$]]|$1|U|3|-4|5|6|7|1Q|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]|12|$5|X|Y|Z|C|$10|13]]|14|$5|X|Y|Z|C|$10|15]]]]

To quote <a href="https://stackoverflow.com/questions/85553/when-should-i-use-a-struct-instead-of-a-class/85656#85656">a good answer to the same question</a> (<a href="https://stackoverflow.com/questions/85553/when-should-i-use-a-struct-instead-of-a-class/85656">When should I use a struct instead of a class?</a>):

<blockquote>
 MSDN has the answer: <a href="http://msdn.microsoft.com/en-us/library/ms229017.aspx" rel="nofollow noreferrer">Choosing Between
 Classes and Structures.</a>
 
 Basically, that page gives you a
 4-item checklist and says to use a
 class unless your type meets all of
 the criteria.
 
 Do not define a structure unless the
 type has all of the following
 characteristics:
 
 <ul>
 <li>It logically represents a single value, similar to primitive types
 (integer, double, and so on).</li>
 <li>It has an instance size smaller than 16 bytes.</li>
 <li>It is immutable.</li>
 <li>It will not have to be boxed frequently.</li>
 </ul>
</blockquote>

Duplicate: <a href="https://stackoverflow.com/questions/85553/when-should-i-use-a-struct-instead-of-a-class/85656">When should I use a structure instead of a class?</a>

Just wondering if anyone can provide some advice or examples of when it is best to use a structure over a class in .NET or vice versa

I have done some background reading and understand the differences between two, ie structures are stored on the stack, classes on the heap ect. But havent been able to find some clear examples where one would provide a benefit over the other.

Many Thanks

.NET Choosing between Structures and Classes

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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复制： 只是想知道是否有人可以提供一些建议或示例，说明什么时候最好在.NET类上使用结构，或者反之亦然。我做了一些背景阅读，并理解了两者之间的区别，即结构存储在堆栈上，类存储在堆上等等。但是，没有找到一些明显的例子，其中一个将提供一个好处的另一个。非常感谢

问.NET在结构和类之间的选择
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