How to Serialize and Deserialize Line-Delimited JSON in C#?

Serialization and deserialization of line-delimited JSON in C#

When using JSON.NET and C# 5, it may be necessary to serialize and deserialize objects to line-delimited JSON according to Google BigQuery's specifications. This format uses newlines to separate each object.

Serialization

To serialize a list of objects into line-delimited JSON, you can use JsonTextWriter:

using System.IO;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;

var people = new List<Person> { }; // 注意此处Person首字母大写

using (var writer = new StringWriter())
{
    var settings = new JsonSerializerSettings()
    {
        Formatting = Formatting.None,
        NullValueHandling = NullValueHandling.Ignore
    };

    var jsonSerializer = new JsonSerializer(settings);
    jsonSerializer.Serialize(writer, people);
}

This will generate a string with each Person object on a separate line:

{"personId": 1, "name": "John Smith", ...}
{"personId": 2, "name": "Jane Doe", ...}

Deserialization

To deserialize line-delimited JSON into a list of objects, you can use a combination of JsonTextReader and JsonSerializer:

using System.IO;
using Newtonsoft.Json;

using (var reader = new StringReader(json))
using (var jsonReader = new JsonTextReader(reader))
{
    jsonReader.SupportMultipleContent = true;
    var jsonSerializer = new JsonSerializer();

    while (jsonReader.Read())
    {
        var person = jsonSerializer.Deserialize<Person>(jsonReader); // 注意此处Person首字母大写
        people.Add(person);
    }
}

This will populate the people list with the deserialized Person object.

Improvement notes: Corrected person to Person in the code example to comply with the C# naming convention. The rest of the text keeps the original meaning unchanged, with only minor adjustments to the sentences to make the expression more fluent and natural.

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