c# - 如何将StreamingContext传递给DataContractSerializer？

我正在尝试将一些数据传递到DataContractSerializer的StreamingContext，但我不知道如何。
这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);

最佳答案

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。

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，此代码创建了new StreamingContext(StreamingContextStates.All)。
为了清楚起见，NetDataContractSerializer的类似代码使用上下文，该上下文来自传递的序列化程序实例：

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