传递继承的“数据合同"；通过WCF调用? [英] Passing an inherited "Data Contract" through WCF call?

问题描述

我的WCF端点之一具有此方法:

One of my WCF endpoints has this method:

GetData(DataTable dt)

我试图在客户端上创建一个继承自DataTable类的类

I tried to create a class on the client that inherits from the DataTable class

public class ExtendedDataTable : DataTable{
  //...implementation
}

并将其与端点调用一起传递:

and pass it along with the endpoint call:

GetData(new ExtendedDataTable());

然后我得到了 SerializationException .相应于该错误，它建议我使用 DataContractResolver 或 KnownType 属性.

Then I got the SerializationException. Accordingly to the error, it suggests that I use either DataContractResolver or the KnownType attribute.

我不想使用KnownType，因为我不必每次有人决定继承我的DataContract时都更新端点.我无法编写任何DataContractResolver，因为我没有扩展DataTable类的确切结构. 是否可以从客户端扩展DataContract? 如果是这样，什么是最佳做法?

I don't want to use the KnownType, because I shouldn't have to update the endpoint every time someone decides to inherit my DataContract. I can't write any DataContractResolver, because I didn't extend the exact structure of the DataTable class. Is it possible to to extend a DataContract from the client? If so, what's the best practice?

谢谢！

推荐答案

我不建议使用Datatable，这会使WCF易于在客户端和服务器序列化方面遇到问题，例如需要指定表名.最好使用自定义数据类型，我们可以将继承类型与KnownType属性一起使用.
https://docs. microsoft.com/zh-CN/dotnet/framework/wcf/feature-details/data-contract-known-types
在我这边，我不能使用继承的数据表，而可以通过使用Knowntype属性使用任意的自定义类.
请参考我的代码段.

I don't recommend using the Datatable, which makes it easy for WCF to have problems with client and server serialization, such as the need to specify a table name. It is best to use a custom data type, we can use the inheritance type with the KnownType attribute.
https://docs.microsoft.com/en-us/dotnet/framework/wcf/feature-details/data-contract-known-types
On my side, I can't use the inherited Datatable, while I could use an arbitrary custom class by using Knowntype attribute.
Please refer to my code segments.

        [DataContract]
    [KnownType(typeof(Product))]
   public class MyData
    {
        [DataMember]
        public ProductBase Product { get; set; }
    }


    [DataContract]
    public class ProductBase
    {
        [DataMember]
        public int ID { get; set; }
    }
    [DataContract]
    public class Product : ProductBase
    {
        [DataMember]
        public string Name { get; set; }

    }

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