.NET JSON序列化:如何使一个DataContract成为另一个DataContract的成员 [英] .NET JSON Serialization: How to have a DataContract as a member of another DataContract
问题描述
我正在尝试序列化一个.net对象,该对象包含另一个数据协定对象作为参数.代码如下...
I am trying to serialize a .net object contains another data contract object as a parameter. The code is as follows...
[DataContract]
public class JsonObject2
{
[DataMember(Name = "field1")]
string field1 { get; set; }
[DataMember(Name = "field2")]
string field2 { get; set; }
[DataMember(Name = "field3")]
object[][] test = { new object[]{"key1", "value1"}, new object[]{"key2", "value2"}, new object[]{"key3", "value3"} };
}
[DataContract]
public class JsonObject3
{
[DataMember(Name = "field1")]
public string field1 { get; set; }
[DataMember(Name = "field2")]
public object field2 { get; set; }
}
DataContractJsonSerializer dcjs2 = new DataContractJsonSerializer(typeof(JsonObject3));
JsonObject3 obj3 = new JsonObject3();
obj3.field1 = "hello";
obj3.field2 = new JsonObject2();
dcjs2.WriteObject(s, obj3);
s.Position = 0;
MessageBox.Show(new StreamReader(s).ReadToEnd());
执行上述操作会导致以下异常...
Doing the above, results in the following exception...
"{"不应使用数据协定名称为'Form1.JsonObject2:http://schemas.datacontract.org/2004/07/JSONParser'的类型'JSONParser.Form1 + JsonObject2'.将任何静态未知的类型添加到已知类型的列表中,例如,通过使用KnownTypeAttribute属性或将它们添加到传递给DataContractSerializer的已知类型的列表中.}"
"{"Type 'JSONParser.Form1+JsonObject2' with data contract name 'Form1.JsonObject2:http://schemas.datacontract.org/2004/07/JSONParser' is not expected. Add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer."}"
我不知道如何执行该例外中给出的任何建议.
I can't figure out how to carry out any of the recommendations given in that exception.
- 如何添加到KnownTypes列表中?
- 如何使用KnownTypeAttribute?
推荐答案
好,找出了解决方法.如果有人发现它有用,我不想删除这个问题,所以这里是解决方法...
Ok, figured out how to do it. I didn't want to delete this question in case someone else finds it useful, so here is the solution...
[DataContract]
[KnownType(typeof(JsonObject2))]
public class JsonObject2
{
[DataMember(Name = "field1")]
string field1 { get; set; }
[DataMember(Name = "field2")]
string field2 { get; set; }
[DataMember(Name = "field3")]
object[][] test = { new object[]{"key1", "value1"}, new object[]{"key2", "value2"}, new object[]{"key3", "value3"} };
}
[DataContract]
public class JsonObject3
{
[DataMember(Name = "field1")]
public string field1 { get; set; }
[DataMember(Name = "field2")]
public object field2 { get; set; }
}
注意JsonObject2类的声明上方的[KnownType(typeof(JsonObject2))]
吗?解决了.
Notice the [KnownType(typeof(JsonObject2))]
above the declaration of the JsonObject2 class ? That solved it.
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