何时使用DataContract和DataMember属性？

问题描述

我对WCF中的 DataContract 属性非常困惑。据我所知，它用于序列化用户定义的类型（如类）。我写了一个这样的类在客户端公开。

I am very confused about the DataContract attribute in WCF. As per my knowledge it is used for serializating user defined type like classes. I wrote one class which is exposed at client side like this.

[DataContract]
public class Contact
{
    [DataMember]
    public int Roll { get; set; }

    [DataMember]
    public string Name { get; set; }

    [DataMember]
    public string Address { get; set; }

    [DataMember]
    public int Age { get; set; }
}

它工作正常，但是当我删除 DataContract时和 DataMember 也可以正常工作。我不明白为什么它可以正常工作。谁能告诉我 DataContract 的实际用途是什么？

It is working properly but when I remove DataContract and DataMember it also works properly. I can't understand why it is working properly. Can any one tell me what is the actual use of DataContract?

我的服务合同如下

[ServiceContract]
public interface IRestServiceImpl
{
    [OperationContract]
    Contact XmlData(string id);
}

推荐答案

Microsoft .NET 3.5 SP1的 [DataContract] 和 [DataMember] 属性不堪重负，Microsoft制作了数据合约序列化程序处理所有类-即使没有这些属性也是如此-就像旧的XML序列化程序一样。

Since a lot of programmers were overwhelmed with the [DataContract] and [DataMember] attributes, with .NET 3.5 SP1, Microsoft made the data contract serializer handle all classes - even without any of those attributes - much like the old XML serializer.

因此，从.NET 3.5 SP1开始，您不必不再添加数据协定或数据成员属性-否则，数据协定序列化程序将序列化类上的所有公共属性，就像XML序列化程序一样。

So as of .NET 3.5 SP1, you don't have to add data contract or data member attributes anymore - if you don't then the data contract serializer will serialize all public properties on your class, just like the XML serializer would.

方法：：不添加这些属性，您将失去许多有用的功能：

HOWEVER: by not adding those attributes, you lose a lot of useful capabilities:

• 没有 [DataContract] ，您不能为数据定义XML命名空间，以供数据保存在其中


• 没有 [DataMember] ，则不能在没有 [DataMember]

• c>，您无法定义序列化顺序（ Order = ），DCS会按字母顺序对所有属性进行序列化


• 而没有 [DataMember] ，您不能为属性定义其他名称（ Name = ）


• 没有 [DataMember] ，您将无法定义 IsRequired = 之类的东西或其他有用的属性


• 没有 [DataMember] ，您不能遗漏某些公共财产-所有公共财产将由DCS序列化

• without [DataContract], you cannot define an XML namespace for your data to live in
• without [DataMember], you cannot serialize non-public properties or fields
• without [DataMember], you cannot define an order of serialization (Order=) and the DCS will serialize all properties alphabetically
• without [DataMember], you cannot define a different name for your property (Name=)
• without [DataMember], you cannot define things like IsRequired= or other useful attributes
• without [DataMember], you cannot leave out certain public properties - all public properties will be serialized by the DCS

因此，对于快速'肮脏解决方案，省去 [DataContract] 和 [DataMember] 属性可以工作-但是将它们包含在数据类中仍然是一个好主意-只是为了更清楚地说明您正在做的事情，并允许您访问所有这些附加功能没有它们你不会得到的...

So for a "quick'n'dirty" solution, leaving away the [DataContract] and [DataMember] attributes will work - but it's still a good idea to have them on your data classes - just to be more explicit about what you're doing, and to give yourself access to all those additional features that you don't get without them...

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