How Can Json.NET Stream and Parse Large JSON Files Efficiently, Handling Nested Objects and Lists?

Json.NET streaming for large JSON files

Parsing huge JSON files can be challenging due to memory limitations. Json.NET provides a way to stream these files, reading and processing the data incrementally.

Object-by-object streaming

When dealing with a JSON file that contains a series of identical objects, it is best to parse and process one object at a time. To do this, avoid deserializing into a C# list. You can use the following code:

<code class="language-csharp">JsonSerializer serializer = new JsonSerializer();
MyObject o;
using (FileStream s = File.Open("bigfile.json", FileMode.Open))
using (StreamReader sr = new StreamReader(s))
using (JsonReader reader = new JsonTextReader(sr))
{
    while (reader.Read())
    {
        if (reader.TokenType == JsonToken.StartObject)
        {
            o = serializer.Deserialize<MyObject>(reader);
            // 处理对象 o
        }
    }
}</code>

This code simplifies object parsing by only deserializing when the object's start tag { is encountered.

Handling nested objects and lists

As mentioned in the question, JSON objects contain nested objects and lists. Json.NET's "object-first" parsing skips these elements, so you'll need to manually deserialize them if needed. To do this, iterate through each object's properties and process nested data as needed.

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