如何将StreamingContext传递给DataContractSerializer？

Question

我正在尝试将一些数据传递给DataContractSerializer的StreamingContext,但我无法弄清楚如何.以下是我的代码的一小部分示例:

MemoryStream stream = new MemoryStream();
DataContractSerializer serializer = new DataContractSerializer(typeof(OldClass));
serializer.WriteObject(stream, _OldClass);
stream.Seek(0, SeekOrigin.Begin);

serializer = new DataContractSerializer(typeof(NewClass));
    //here I would like to give the serializer e.g. a string as StreamingContext.Context
_NewClass = (NewClass)serializer.ReadObject(stream);

Answer 1

你不能.

使用时DataContractSerializer,StreamingContext传递给序列化/反序列化回调的实例来自内部XmlObjectSerializerContext.

这是初始化代码:

internal XmlObjectSerializerContext(DataContractSerializer serializer, DataContract rootTypeDataContract, DataContractResolver dataContractResolver)  
    : this(serializer, serializer.MaxItemsInObjectGraph, new StreamingContext(StreamingContextStates.All), serializer.IgnoreExtensionDataObject, dataContractResolver)
{
    // ...
}

如您所见,此代码创建new StreamingContext(StreamingContextStates.All).
为了清楚起见,NetDataContractSerializer使用上下文的类似代码来自传递的序列化程序实例:

internal XmlObjectSerializerContext(NetDataContractSerializer serializer) 
    : this(serializer, serializer.MaxItemsInObjectGraph, serializer.Context, serializer.IgnoreExtensionDataObject)
{
}