How Can Json.NET Efficiently Parse Large JSON Files in C#?

Efficiently parse medium and large JSON files in C#: Detailed explanation of Json.NET method

When processing large JSON files in C#, loading them directly into an array may encounter performance bottlenecks. This article will introduce an efficient solution using the Json.NET library.

Json.NET solution

Json.NET is a popular JSON parsing library in C#. It provides a convenient and efficient way to read and parse JSON data.

The following example demonstrates how to load a large JSON file into List<Item> using Json.NET:

<code class="language-csharp">public void LoadJson()
{
    using (StreamReader r = new StreamReader("file.json"))
    {
        string json = r.ReadToEnd();
        List<Item> items = JsonConvert.DeserializeObject<List<Item>>(json);
    }
}

public class Item
{
    public int millis;
    public string stamp;
    public DateTime datetime;
    public string light;
    public float temp;
    public float vcc;
}</code>

This code first reads the JSON file into a json string and then uses JsonConvert.DeserializeObject to deserialize it into List<Item>. Each element in the list represents an object whose properties correspond to JSON nodes.

Dynamic data processing

No need to create a custom class, Json.NET can also dynamically obtain JSON data values. An example is as follows:

<code class="language-csharp">dynamic array = JsonConvert.DeserializeObject(json);
foreach (var item in array)
{
    Console.WriteLine("{0} {1}", item.temp, item.vcc);
}</code>

Here, array a variable is a dynamic object that allows access to its properties without type checking. This approach is more convenient if you don't need to store the data in a specific object.

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