[英]Why can't WCF pass an object in a dictionary?
In my WCF service I have the object QualifiedNumber
defined as KnownType
and ServiceKnown
type. 在我的WCF服务中,我将对象
QualifiedNumber
定义为KnownType
和ServiceKnown
类型。 If I used the QualifiedNumber
in the following methods: 如果我在以下方法中使用了
QualifiedNumber
:
This one does NOT work. 这一项不起作用。 It throws an exception that in part reads:
它抛出一个部分读取的异常:
Element ' http://schemas.microsoft.com/2003/10/Serialization/Arrays:Value ' contains data of the ' http://schemas.datacontract.org/2004/07 ServiceLibrary.Web.Model:QualifiedNumber' data contract.
元素' http://schemas.microsoft.com/2003/10/Serialization/Arrays:Value '包含' http://schemas.datacontract.org/2004/07 ServiceLibrary.Web.Model:QualifiedNumber'数据协定的数据。 The deserializer has no knowledge of any type that maps to this contract.
解串器不知道任何映射到该合同的类型。 cannot deserialize because the definition of QualifiedNumber is not known.
无法反序列化,因为QualifiedNumber的定义未知。
[OperationContract]
public Dictionary<int, object> TestDictionaryGet()
{
Dictionary<int, object> retDict = new Dictionary<int, object>();
retDict.Add(1, new QualifiedNumber(new decimal(1.2), "<"));
retDict.Add(2, "pass a simple string");
return retDict;
}
This one DOES work 这确实起作用
public struct element
{
public int key;
public object value;
}
[OperationContract]
public List<element> TestElementListGet()
{
Dictionary<int, object> retDict = new Dictionary<int, object>();
retDict.Add(1, new QualifiedNumber(new decimal(1.2), "<"));
retDict.Add(2, "pass a simple string");
List<element> retElements = new List<element>();
foreach (KeyValuePair<int, object> item in retDict)
{
element newElement;
newElement.key = item.Key;
newElement.value = item.Value;
retElements.Add(newElement);
}
return retElements;
}
What is it about the dictionary that causes the exception? 导致异常的字典是什么?
Here is a detailed article on generic dictionary serialization over WCF: 这是有关通过WCF进行通用词典序列化的详细文章:
http://www.request-response.com/blog/PermaLink,guid,ff5fab81-affb-4b2b-aa67-c80bdfc86cbd.aspx http://www.request-response.com/blog/PermaLink,guid,ff5fab81-affb-4b2b-aa67-c80bdfc86cbd.aspx
The takeaway quote from that article would be: 该文章的外卖报价为:
There is no way to meaningfully convey the semantics of a .NET dictionary class using WSDL/XSD.
无法使用WSDL / XSD有意义地传达.NET词典类的语义。
You simply need to add the following property to your datacontract class. 您只需要向datacontract类添加以下属性。
[DataMember]
public object UsedForKnownTypeSerializationObject;
So now the generated proxy contains the Knowtypes you set on the datacontract. 因此,现在生成的代理包含您在数据合同上设置的知识类型。 I had the same problem and this is the only solution I came up with.
我遇到了同样的问题,这是我想到的唯一解决方案。 If you don't at the a property of type Object to you DataContract class, the generated proxy doesn't contain the declared knowtypes
如果您不在DataContract类的Object类型的属性中,则生成的代理不包含声明的知识类型
For example: 例如:
[DataContract]
[KnownType(typeof(List<String>))]
public class Foo
{
[DataMember]
public String FooName { get; set; }
[DataMember]
public IDictionary<String, Object> Inputs { get; set; }
[DataMember]
private Object UsedForKnownTypeSerializationObject{ get; set; }
}
It's not as pretty because you end up with a dummy property which doesn't have any functional implementation. 它不是那么漂亮,因为您最终得到一个没有任何功能实现的虚拟属性。 But then again I don't have another solution.
但话又说回来,我没有其他解决方案。
You could wrap the Dictionary in a List. 您可以将字典包装在列表中。 So your code would look like:
因此您的代码如下所示:
[OperationContract]
public List<Dictionary<int, object>> TestDictionaryGet()
{
var resultList = new List<Dictionary<int, object>>();
Dictionary<int, object> retDict = new Dictionary<int, object>();
retDict.Add(1, new QualifiedNumber(new decimal(1.2), "<"));
retDict.Add(2, "pass a simple string");
resultList.Add(retDict);
return resultList;
}
It´s not really pretty. 这不是很漂亮。 But an easy way to tranfer a Dictionary via WCF.
但是通过WCF传输字典的一种简单方法。
使用Serializeable
属性标记QualifiedNumber
。
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