C#遍历非统一结构动态JSON遇阻，求指导提取日期字段

你当前的遍历层级错误：代码里遍历的是results.items，但这个数组里的每个元素内部还有一个名为item的子数组，真正存储date1和date2的是这个子数组，所以直接访问item.date1自然找不到对应字段。

方案1：调整Dynamic遍历逻辑 #

直接补充嵌套遍历，先遍历外层items，再遍历内层item数组：

using (var httpClient = new HttpClient())
{
    httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "myToken");
    httpClient.BaseAddress = new Uri("https://app.website.com/data/");

    HttpResponseMessage response = httpClient.GetAsync("getData.json?item=myItem").Result;
    response.EnsureSuccessStatusCode();

    dynamic result = JsonConvert.DeserializeObject(response.Content.ReadAsStringAsync().Result);
    
    foreach (var outerItem in result.results.items)
    {
        // 遍历内层存储日期的item数组
        foreach (var dateEntry in outerItem.item)
        {
            Console.WriteLine($"date1: {dateEntry.date1}, date2: {dateEntry.date2}");
        }
    }
}

方案2：使用强类型模型（推荐生产环境） #

用C#类映射JSON结构，避免dynamic的类型风险，编译期就能发现错误：

定义模型类 #

public class RootResponse
{
    public ResultsContainer results { get; set; }
}

public class ResultsContainer
{
    public List<OuterItem> items { get; set; }
}

public class OuterItem
{
    public List<DateEntry> item { get; set; }
}

public class DateEntry
{
    public string date1 { get; set; }
    public string date2 { get; set; }
}

解析并提取数据 #

using (var httpClient = new HttpClient())
{
    httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "myToken");
    httpClient.BaseAddress = new Uri("https://app.website.com/data/");

    HttpResponseMessage response = httpClient.GetAsync("getData.json?item=myItem").Result;
    response.EnsureSuccessStatusCode();

    string json = response.Content.ReadAsStringAsync().Result;
    RootResponse root = JsonConvert.DeserializeObject<RootResponse>(json);
    
    foreach (var outerItem in root.results.items)
    {
        foreach (var dateEntry in outerItem.item)
        {
            Console.WriteLine($"date1: {dateEntry.date1}, date2: {dateEntry.date2}");
        }
    }
}

你提供的JSON示例存在格式错误（比如对象末尾多余的逗号），如果实际请求返回的JSON也有这类问题，需要先修复，否则JsonConvert会解析失败。

内容的提问来源于stack exchange，提问作者eek