REST 查询的响应正文中缺少 JSON 数据

Posted 2023-04-12

【中文标题】REST 查询的响应正文中缺少 JSON 数据

【英文标题】：JSON data missing in the response body of a REST query

【发布时间】：2021-08-09 19:02:57

【问题描述】：

public class WeatherForecastController : ControllerBase

    private static readonly string[] Summaries = new[]
    
        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
    ;

    [HttpGet]
    public HttpResponseMessage Get() //IEnumerable<WeatherForecast> Get()
    
        var rng = new Random();
        WeatherForecast[] list = Enumerable.Range(1, 5).Select(index => new WeatherForecast
        
            Date = DateTime.Now.AddDays(index),
            TemperatureC = rng.Next(-20, 55),
            Summary = Summaries[rng.Next(Summaries.Length)]
        ).ToArray();
        HttpResponseMessage msg = new HttpResponseMessage(HttpStatusCode.OK);
        var json = JsonConvert.SerializeObject(list);
        msg.Content = new StringContent(json, System.Text.Encoding.UTF8, "application/json");
        return msg;
    

使用 GET 查询 https://localhost:8675/weatherforecast

我在正文中收到以下响应：

    "version": 
        "major": 1,
        "minor": 1,
        "build": -1,
        "revision": -1,
        "majorRevision": -1,
        "minorRevision": -1
    ,
    "content": 
        "headers": [
                "Key": "Content-Type",
                "Value": ["application/json; charset=utf-8"]
            
        ]
    ,
    "statusCode": 200,
    "reasonPhrase": "OK",
    "headers": [],
    "trailingHeaders": [],
    "requestMessage": null,
    "isSuccessStatusCode": true

Summaries 数组的数据以及温度未返回。 有人可以告知如何在 REST 查询的响应正文中发送 JSON 数据吗？

【问题讨论】：

你可以这样做return Json(list);

【参考方案1】：

只需返回Object，返回类型为IActionResult

[HttpGet]
public IActionResult Get() //IEnumerable<WeatherForecast> Get()

    var rng = new Random();
    WeatherForecast[] list = Enumerable.Range(1, 5).Select(index => new WeatherForecast
    
        Date = DateTime.Now.AddDays(index),
        TemperatureC = rng.Next(-20, 55),
        Summary = Summaries[rng.Next(Summaries.Length)]
    ).ToArray();
    //HttpResponseMessage msg = new HttpResponseMessage(HttpStatusCode.OK);
    //var json = JsonConvert.SerializeObject(list);
    //msg.Content = new StringContent(json, System.Text.Encoding.UTF8, "application/json");
    return Ok(list);

【讨论】：

你应该跳过 JsonConvert 直接使用return OK(list);。

@JasonC，是的，你是对的。您可以直接返回列表。简单易行。

感谢 Krishna 和 Jason 的回答！此更改解决了我的问题。但是，我想问是否有一种方法可以使用 HttpResponseMessage 或任何其他可以访问 HTTP 消息的每个标头的构造来发送列表。

@SumeetPannu，希望 ***.com/questions/54136488/… 有所帮助