如何在c#中编写Json文件?

Hi I need to write the following data into a text file using Json format in C#? BRACKETS are important to be valid JSON FORMAT

你好，我需要用c#中的Json格式将下面的数据写入一个文本文件中?括号对于有效的JSON格式很重要

[
  {
    "Id": 1,
    "SSN": 123,
    "Message": "whatever"

  },
  {
   "Id": 2,
    "SSN": 125,
    "Message": "whatever"
  }
]

and here is my model class

这是我的模型类。

public class data
{
    public int Id { get; set; }
    public int SSN { get; set; }
    public string Message {get; set;}

}

4 个解决方案

#1

162

I would recommend Json.Net, see example below:

我建议Json。净,见下面的例子:

List<data> _data = new List<data>();
_data.Add(new data()
{
    Id = 1,
    SSN = 2,
    Message = "A Message"
});

string json = JsonConvert.SerializeObject(_data.ToArray());

//write string to file
System.IO.File.WriteAllText(@"D:\path.txt", json);

Or the slightly more efficient version of the above code (doesn't use a string as a buffer):

或者上面代码的稍微有效的版本(不使用字符串作为缓冲区):

//open file stream
using (StreamWriter file = File.CreateText(@"D:\path.txt"))
{
     JsonSerializer serializer = new JsonSerializer();
     //serialize object directly into file stream
     serializer.Serialize(file, _data);
}

Documentation: Serialize JSON to a file

文档:将JSON序列化为文件

Why? Here's a feature comparision between common serialisers as well as benchmark tests .

为什么?这是一个功能比较常见serialisers之间以及基准测试。

Below is a graph of performance taken from the linked article:

以下是链接文章中的绩效图表:

This seperate post, states that:

这篇文章分别指出:

Json.NET has always been memory efficient, streaming the reading and writing large documents rather than loading them entirely into memory, but I was able to find a couple of key places where object allocations could be reduced...... (now) Json.Net (6.0) allocates 8 times less memory than JavaScriptSerializer

Json。NET一直以来都是内存高效的，它将读取和写入大型文档流到内存中，而不是将它们全部加载到内存中，但是我能够找到几个关键的位置，以便减少对象的分配…(现在)Json。Net(6.0)分配的内存比JavaScriptSerializer少8倍

。

^{_{Benchmarks appear to be Json.Net 5, the current version (on writing) is 10. What version of standard .Net serialisers used is not mentioned}}

基准似乎Json。Net 5，当前版本(写时)是10。没有提到使用的标准。net序列化器的版本

^{_{These tests are obviously from the developers who maintian the library. I have not verified their claims. If in doubt test them yourself.}}

这些测试显然是来自开发人员维护图书馆。我还没有证实他们的说法。如果有疑问，自己去测试一下。

#2

The example in Liam's answer saves the file as string in a single line. I prefer to add formatting. Someone in the future may want to change some value manually in the file. If you add formatting it's easier to do so.

在Liam的回答中，这个例子将文件作为字符串保存在一行中。我更喜欢添加格式。将来可能有人想要在文件中手动更改一些值。如果您添加了格式，那么这样做更容易。

The following adds basic JSON indentation:

下面添加了基本的JSON缩进:

 string json = JsonConvert.SerializeObject(_data.ToArray(), Formatting.Indented);

#3

There is built in functionality for this using the JavaScriptSerializer Class:

使用JavaScriptSerializer类为它构建了一些功能:

var json = JavaScriptSerializer.Serialize(data);

#4

var responseData = //Fetch Data
string jsonData = JsonConvert.SerializeObject(responseData, Formatting.None);
System.IO.File.WriteAllText(Server.MapPath("~/JsonData/jsondata.txt"), jsonData);

#1

162