尝试在 C# 中反序列化一个复杂的 json 文件

Question

我正在尝试在 c# 中反序列化一个 json 文件并使用键打印每个单独值的值，但是对于作为列表的 json 值，我是无法打印所需的值。 Json 文件：

{   
    "prod": {
        "vpc_name": "vpc-us-east-1-it-prod",
        "subnets": {
            "application": [ "subnet-1234", "subnet-1345" ],
            "data":        [ "subnet-64t3", "subnet-f321" ],
            "edge":        [ "subnet-1ff3", "subnet-134g" ]
        }
    },
    "dev": {
        "vpc_name": "vpc-us-east-1-it-dev",
        "subnets": {
            "application": [ 
                { "subnet_id": "subnet-2345tf", "az": "us-east-1a" },
                { "subnet_id": "subnet-143f1", "az": "us-east-1b" }
            ],
            "data":        [ 
                { "subnet_id": "subnet-134f", "az": "us-east-1b" },
                { "subnet_id": "subnet-1324", "az": "us-east-1a" }
            ],
            "edge":        [ 
                { "subnet_id": "subnet-123434", "az": "us-east-1a" },
                { "subnet_id": "subnet-123fg", "az": "us-east-1b" }
            ]
        }
    }
}

C#代码

using System;
using System.Collections.Generic;
using System.IO;
using System.Text.Json;

namespace JsonDeserializer
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            string jsonString = File.ReadAllText(@"C:/Users/Stephen.Carvalho/source\repos/JsonDeserializer/JsonDeserializer/vpc_stack.json");
            Rootobject vpcs = JsonSerializer.Deserialize<Rootobject>(jsonString);
            Console.WriteLine(vpcs.dev.vpc_name);
            Console.WriteLine(vpcs.dev.subnets.application);

        }
    }


    public class Rootobject
    {
        public Prod prod { get; set; }
        public Dev dev { get; set; }
    }

    public class Prod
    {
        public string vpc_name { get; set; }
        public Subnets subnets { get; set; }
    }

    public class Subnets
    {
        public string[] application { get; set; }
        public string[] data { get; set; }
        public string[] edge { get; set; }
    }

    public class Dev
    {
        public string vpc_name { get; set; }
        public Subnets1 subnets { get; set; }
    }

    public class Subnets1
    {
        public Application[] application { get; set; }
        public Datum[] data { get; set; }
        public Edge[] edge { get; set; }
    }

    public class Application
    {
        public string subnet_id { get; set; }
        public string az0885b3b66d { get; set; }
        public string az { get; set; }
    }

    public class Datum
    {
        public string subnet_id { get; set; }
        public string az { get; set; }
    }

    public class Edge
    {
        public string subnet_id { get; set; }
        public string az { get; set; }
    }
}

输出

Hello World!
vpc-us-east-1-it-dev
JsonDeserializer.Application[]

我想用 prod.subnets 打印应用程序子网列表，但我没有得到返回值，而是得到 JsonDeserializer.Application[] 作为输出

Answer 1

那是因为vpcs.dev.subnets.application是Application的数组。您可以通过首先获取 subnet_ids 然后将该数组转换为字符串来打印应用程序子网数组。

你看到 JsonDeserializer.Application[] 的原因是因为你打印了对象本身。当你这样做时，你得到的是对象类型的名称而不是里面的值

Console.WriteLine(string.Join(", ", vpcs.dev.subnets.application.Select(x => x.subnet_id)));

Select 语句遍历每个应用程序，returns 仅遍历 subnet_id。无论何时你有一个数组/列表，你都可以使用 select 方法从列表中获取特定的项目或者用它创建新的对象。

Documentation on Select

Answer 2

这是因为您试图在一行中打印一个数组，所以您可以尝试这样做：

Array.ForEach(vpcs.dev.subnets.application, Console.WriteLine);

或将其解析为列表并打印出来

vpcs.dev.subnets.application.ToList().ForEach(i => Console.WriteLine(i.ToString()));

或者您也可以尝试在 foreach 中执行此操作：

foreach(var item in vpcs.dev.subnets.application)
{
    Console.WriteLine(item.ToString());
}

尝试在 C# 中反序列化一个复杂的 json 文件

Trying to deserialize a complex json file in c#

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json

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