我需要将内存流的任意内容转换为JSON。这是我正在尝试做的一个简单示例:
class Program
{
class TestClass { public int Test1;}
static void Main(string[] args)
{
var ms = new MemoryStream();
var writer = new StreamWriter(ms);
writer.Write(new TestClass());
writer.Flush();
ms.Position = 0;
var json = JsonConvert.SerializeObject(/*???*/, Formatting.Indented);
Console.Write(json);
Console.Read();
}
}
不确定传递给SerializeObject方法的内容。如果我通过MemoryStream(变量ms),则会收到错误消息:
是否可以序列化流的任意内容?
谢谢
最佳答案
可以使用转换器实现对MemoryStream的内容进行序列化和反序列化:
public class MemoryStreamJsonConverter : JsonConverter
{
public override bool CanConvert(Type objectType)
{
return typeof(MemoryStream).IsAssignableFrom(objectType);
}
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
var bytes = serializer.Deserialize<byte[]>(reader);
return bytes != null ? new MemoryStream(bytes) : new MemoryStream();
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
var bytes = ((MemoryStream)value).ToArray();
serializer.Serialize(writer, bytes);
}
}
然后您的代码可能看起来像这样(为了更方便地比较json序列化和反序列化,我将“new TestClass()”更改为“Test string”):
private void CheckJsonSerialization()
{
var ms = new MemoryStream();
var writer = new StreamWriter(ms);
writer.WriteLine("Test string");
writer.Flush();
ms.Position = 0;
var json = JsonConvert.SerializeObject(ms, Formatting.Indented, new MemoryStreamJsonConverter());
var ms2 = JsonConvert.DeserializeObject<MemoryStream>(json, new MemoryStreamJsonConverter());
var reader = new StreamReader(ms2);
var deserializedString = reader.ReadLine();
Console.Write(json);
Console.Write(deserializedString);
Console.Read();
}
当Stream是序列化对象的属性时,也可以使用这种转换器:
public class ClassToCheckSerialization
{
public string StringProperty { get; set; }
[JsonConverter(typeof(MemoryStreamJsonConverter))]
public Stream StreamProperty { get; set; }
}
private void CheckJsonSerializationOfClass()
{
var data = new ClassToCheckSerialization();
var ms = new MemoryStream();
const string entryString = "Test string inside stream";
var sw = new StreamWriter(ms);
sw.WriteLine(entryString);
sw.Flush();
ms.Position = 0;
data.StreamProperty = ms;
var json = JsonConvert.SerializeObject(data);
var result = JsonConvert.DeserializeObject<ClassToCheckSerialization>(json);
var sr = new StreamReader(result.StreamProperty);
var stringRead = sr.ReadLine();
//Assert.AreEqual(entryString, stringRead);
}
关于c# - Newtonsoft Json.net-如何序列化流的内容?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/30331027/