Question

我试图将一些数据传递给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DataContractSerializer时，传递给序列化/反序列化回调的StreamingContext实例来自内部XmlObjectSerializerContext。

此处的初始化代码：

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

如您所见，此代码会创建new StreamingContext(StreamingContextStates.All) 为了清楚起见，NetDataContractSerializer的类似代码使用了来自传递的序列化程序实例的上下文：

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

如何将StreamingContext传递给DataContractSerializer？

1 个答案: