使用Json.NET进行Bson数组(反)序列化 [英] Bson array (de)serialization with Json.NET

问题描述

我只是尝试使用Json.NET对Bson格式的字符串数组进行序列化和反序列化，但是以下代码失败:

I am simply trying to serialize and deserialize a string array in Bson format using Json.NET, but the following code fails:

var jsonSerializer = new JsonSerializer();
var array = new string [] { "A", "B" };

// Serialization
byte[] bytes;
using (var ms = new MemoryStream())
using (var bson = new BsonWriter(ms))
{
    jsonSerializer.Serialize(bson, array, typeof(string[]));
    bytes = ms.ToArray();
}

// Deserialization
using (var ms = new MemoryStream(bytes))
using (var bson = new BsonReader(ms))
{
    // Exception here
    array = jsonSerializer.Deserialize<string[]>(bson);
}

异常消息:

无法将当前JSON对象(例如{"name":"value"})反序列化为类型'System.String []'，因为该类型需要JSON数组(例如[1,2,3])才能正确反序列化

Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.String[]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.

要解决此错误，可以将JSON更改为JSON数组(例如[1,2,3])，也可以更改反序列化类型，使其成为普通的.NET类型(例如，不是整数之类的原始类型，而不是可以从JSON对象反序列化的集合类型(如数组或List).还可以将JsonObjectAttribute添加到类型中，以强制其从JSON对象反序列化.

To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object.

如何使它正常工作?

推荐答案

在BsonReader上将ReadRootValueAsArray设置为true

Set ReadRootValueAsArray to true on BsonReader

http://james.newtonking. com/projects/json/help/index.html?topic = html/P_Newtonsoft_Json_Bson_BsonReader_ReadRootValueAsArray.htm

此设置是必需的，因为BSON数据规范不会保存有关根值是对象还是数组的元数据.

This setting is required because the BSON data spec doesn't save metadata about whether the root value is an object or an array.

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