blocks|key|1519124|text|DTO的定义可以在Martin+Fowler's+site上找到。DTO用于将参数传递给方法和作为返回类型。许多人在UI中使用它们，但也有人从它们中膨胀领域对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1519125|entityMap|0|LINK|mutability|MUTABLE|url|http://martinfowler.com/eaaCatalog/dataTransferObject.html^0|9|K|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

The definition for DTO can be found on <a href="http://martinfowler.com/eaaCatalog/dataTransferObject.html" rel="noreferrer">Martin Fowler's site</a>. DTOs are used to transfer parameters to methods and as return types. A lot of people use those in the UI, but others inflate domain objects from them.

blocks|key|1519186|text|DTO是一个哑巴对象-它只包含属性，有getter和setter，但没有其他有意义的逻辑(可能除了compare()或equals()实现)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1519187|通常，MVC中的模型类(这里假设是.net+MVC+)是DTO，或者DTO的集合/聚合|1519188|entityMap^0|1D|9|1N|8|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

A DTO is a dumb object - it just holds properties and has getters and setters, but no other logic of any significance (other than maybe a <code>compare()</code> or <code>equals()</code> implementation).
Typically model classes in MVC (assuming .net MVC here) are DTOs, or collections/aggregates of DTOs

blocks|key|1304258|text|数据传输对象是用于封装数据并将其从应用程序的一个子系统发送到另一个子系统的对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1304259|DTO最常被N层应用程序中的服务层用来在其自身和UI层之间传输数据。这里的主要好处是，它减少了在分布式应用程序中需要通过网络发送的数据量。它们还可以在MVC模式中创建很好的模型。|1304260|DTO的另一个用途是封装方法调用的参数。如果一个方法需要四个或五个以上的参数，这会很有用。|1304261|在使用DTO模式时，您还可以使用DTO汇编程序。汇编程序用于从域对象创建DTO，反之亦然。|1304262|从域对象到DTO再转换回来可能是一个代价高昂的过程。如果您不是在创建分布式应用程序，那么您可能不会像Martin+Fowler+explains+here那样从模式中看到任何巨大的好处。|offset|length|1304263|entityMap|0|LINK|mutability|MUTABLE|url|http://martinfowler.com/bliki/LocalDTO.html^0|0|0|0|0|1E|R|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$J|Y|K|Z|1|10]]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

A Data Transfer Object is an object that is used to encapsulate data, and send it from one subsystem of an application to another.
DTOs are most commonly used by the Services layer in an N-Tier application to transfer data between itself and the UI layer. The main benefit here is that it reduces the amount of data that needs to be sent across the wire in distributed applications. They also make great models in the MVC pattern.
Another use for DTOs can be to encapsulate parameters for method calls. This can be useful if a method takes more than four or five parameters.
When using the DTO pattern, you would also make use of DTO assemblers. The assemblers are used to create DTOs from Domain Objects, and vice versa.
The conversion from Domain Object to DTO and back again can be a costly process. If you're not creating a distributed application, you probably won't see any great benefits from the pattern, as <a href="http://martinfowler.com/bliki/LocalDTO.html" rel="noreferrer">Martin Fowler explains here</a>.

blocks|key|1304310|text|数据传输对象(DTO)描述“在进程之间传送数据的对象”(Wikipedia)或“用于封装数据并将其从应用程序的一个子系统发送到另一个子系统的对象”(Stack+Overflow+answer)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1304311|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Data transfer object (DTO) describes “an object that carries data
between processes” (Wikipedia) or an “object that is used to encapsulate data,
and send it from one subsystem of an application to another” (Stack Overflow
answer).

blocks|key|1519361|text|数据传输对象背后的原则是创建只包含特定数据事务所需的必要属性的新数据对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1519362|好处包括：|1519363|使数据传输更加安全如果您删除所有不必要的数据，请减小传输大小。|1519364|阅读更多：https://www.codenerd.co.za/what-is-data-transfer-objects|offset|length|1519365|entityMap|0|LINK|mutability|MUTABLE|url|https://www.codenerd.co.za/what-is-data-transfer-objects^0|0|0|0|5|1K|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@$H|V|I|W|1|X]]|A|$]]|$1|J|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]]]

The principle behind Data Transfer Object is to create new Data Objects that only include the necessary properties you need for a specific data transaction.
Benefits include:
Make data transfer more secure
Reduce transfer size if you remove all unnecessary data.
Read More: <a href="https://www.codenerd.co.za/what-is-data-transfer-objects" rel="nofollow noreferrer">https://www.codenerd.co.za/what-is-data-transfer-objects</a>

blocks|key|1519438|text|一些程序员使用DTO来区分将要通过API传递的最终对象数据。因此，它基本上是端点的有效负载对象。例如，您可以将传递给服务器的联系人表单值对象命名为contactFormDto+or+contactFromPayload，然后您或任何其他程序员都知道您在该对象中拥有的是将通过网络传输的数据的最终形状。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1519439|entityMap^0|21|10|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

Some programmers use DTO to distinguish their final object data that is going to be passed through an API. So, it is basically a payload object to an endpoint. Like, you could name your contact form values object that you pass to the server as <code>contactFormDto or contactFromPayload</code>, then you or any other programmer know what you have in that object is final shape of the data, that is going to travel through network.

What is a Data Transfer Object?

In MVC are the model classes DTO, and if not what are the differences and do we need both?

What is a Data Transfer Object (DTO)?

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什么是数据传输对象？在MVC中是模型类DTO，如果不是，有什么区别，我们需要两者吗？

问什么是数据传输对象(DTO)？
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