如何用C#的Newtonsoft.Json从含数组的JSON中提取accountId

方法一：动态类型解析 #

无需预先定义实体类，直接逐层访问JSON节点：

using Newtonsoft.Json;
using System;

// 目标JSON字符串
string json = @"{""AccountListResponse"": {""Accounts"": {""Account"": [ {""accountId"":""0001"",""accountIdKey"":""key1"",""accountMode"":""ON""}, {""accountId"":""00021"",""accountIdKey"":""key21"",""accountMode"":""ON""}, {""accountId"":""00031"",""accountIdKey"":""key31"",""accountMode"":""ON""} ] } } }";

// 反序列化为动态对象
dynamic responseObj = JsonConvert.DeserializeObject(json);

// 遍历Account数组，提取accountId
foreach (var account in responseObj.AccountListResponse.Accounts.Account)
{
    Console.WriteLine(account.accountId);
}

方法二：强类型实体类解析 #

通过定义与JSON结构匹配的实体类，实现编译时类型检查，更适合生产环境：
首先定义对应实体类：

// 根对象
public class RootResponse
{
    public AccountListResponse AccountListResponse { get; set; }
}

public class AccountListResponse
{
    public AccountsContainer Accounts { get; set; }
}

public class AccountsContainer
{
    public Account[] Account { get; set; }
}

public class Account
{
    public string accountId { get; set; }
    public string accountIdKey { get; set; }
    public string accountMode { get; set; }
}

然后执行反序列化与提取：

using Newtonsoft.Json;
using System;

string json = @"{""AccountListResponse"": {""Accounts"": {""Account"": [ {""accountId"":""0001"",""accountIdKey"":""key1"",""accountMode"":""ON""}, {""accountId"":""00021"",""accountIdKey"":""key21"",""accountMode"":""ON""}, {""accountId"":""00031"",""accountIdKey"":""key31"",""accountMode"":""ON""} ] } } }";

// 反序列化为强类型对象
var root = JsonConvert.DeserializeObject<RootResponse>(json);

// 遍历数组提取accountId
foreach (var account in root.AccountListResponse.Accounts.Account)
{
    Console.WriteLine(account.accountId);
}

两种方法对比：

• 动态类型：实现快速，无需编写实体类，但缺少编译时类型校验，适合临时调试或简单场景
• 强类型：类型安全，有IDE智能提示，适合复杂业务场景和生产代码

内容的提问来源于stack exchange，提问作者DM DM