WCF 中的 DataContract 有什么意义? [英] What's the point of a DataContract in WCF?

问题描述

VS.net 在您创建 WCF 项目时创建模板.

VS.net creates a template when you create a WCF project.

它在 iService1.cs 文件中添加了一个类:

It adds a class to the iService1.cs file:

// Use a data contract as illustrated in the sample below to
// add composite types to service operations.
[DataContract]
public class CompositeType
{
    bool boolValue = true;
    string stringValue = "Hello ";

    [DataMember]
    public bool BoolValue
    {
        get { return boolValue; }
        set { boolValue = value; }
    }

    [DataMember]
    public string StringValue
    {
        get { return stringValue; }
        set { stringValue = value; }
    }
}

既然 WCF 服务可以返回任何用户定义的类，为什么要使用 DataContract 和 CompositeType 类?

Since a WCF service can return any user defined class, why use a DataContract and CompositeType class?

我可以返回如下内容:

 [OperationContract]
MyUserCollection GetUsers();

我错过了什么?

推荐答案

DataContract 只是对服务边界两边都可以理解的类型的正式定义.

The DataContract is just a formal definition of a type that can be understood on both sides of the service boundary.

如果您在示例中返回MyUserCollection"对象，则您的服务使用者将需要引用您的服务/系统的内部结构，这违反了 SOA 明确边界原则.通过使用 DataContract，您可以以松散耦合的方式发布返回类型的结构.

If you return, as in your example, a "MyUserCollection" object, the consumers of your service will need to reference the innards of your service/system, which is a violation of the SOA tenet of explicit boundaries. By using a DataContract, you are publishing the structure of your return types in a loosely-coupled way.

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