我正在尝试使用.NET 4.0任务模式反序列化从http://api.usa.gov/jobs/search.json?query=nursing+jobs
返回的JSON数据。 它返回以下JSON数据(在http://jsonviewer.stack.hu/
上加载JSON数据)。
[
{
"id": "usajobs:353400300",
"position_title": "Nurse",
"organization_name": "Indian Health Service",
"rate_interval_code": "PA",
"minimum": 42492,
"maximum": 61171,
"start_date": "2013-10-01",
"end_date": "2014-09-30",
"locations": [
"Gallup, NM"
],
"url": "https://www.usajobs.gov/GetJob/ViewDetails/353400300"
},
{
"id": "usajobs:359509200",
"position_title": "Nurse",
"organization_name": "Indian Health Service",
"rate_interval_code": "PA",
"minimum": 42913,
"maximum": 61775,
"start_date": "2014-01-16",
"end_date": "2014-12-31",
"locations": [
"Gallup, NM"
],
"url": "https://www.usajobs.gov/GetJob/ViewDetails/359509200"
},
...
]
索引操作:
public class HomeController : Controller
{
public ActionResult Index()
{
Jobs model = null;
var client = new HttpClient();
var task = client.GetAsync("http://api.usa.gov/jobs/search.json?query=nursing+jobs")
.ContinueWith((taskwithresponse) =>
{
var response = taskwithresponse.Result;
var jsonTask = response.Content.ReadAsAsync<Jobs>();
jsonTask.Wait();
model = jsonTask.Result;
});
task.Wait();
...
}
工作和工作类:
[JsonArray]
public class Jobs { public List<Job> JSON; }
public class Job
{
[JsonProperty("organization_name")]
public string Organization { get; set; }
[JsonProperty("position_title")]
public string Title { get; set; }
}
当我在jsonTask.Wait();
上设置断点并检查jsonTask
时,状态为Faulted。 InnerException是“Type ProjectName.Jobs is not a collection。”
我最初使用了没有JsonArray属性的Jobs类型和作为数组(Job[])的Jobs,并出现了这个错误。
public class Jobs { public Job[] JSON; }
+ InnerException {"Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'ProjectName.Models.Jobs' because the type requires a JSON object (e.g. {\"name\":\"value\"}) to deserialize correctly.\r\n
To fix this error either change the JSON to a JSON object (e.g. {\"name\":\"value\"}) or change the deserialized type to an array or a type that implements a collection interface
(e.g. ICollection, IList) like List<T> that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.\r\n
Path '', line 1, position 1."} System.Exception {Newtonsoft.Json.JsonSerializationException}
如何使用.NET 4.0任务模式处理此网站的JSON?在转向.NET 4.5的await async
模式之前,我想让它正常工作。
答案更新:
这里是一个演示如何使用.NET 4.5 async await模式的示例,结合了brumScouse的回答。
public async Task<ActionResult>Index()
{
List<Job> model = null;
var client = newHttpClient();
// .NET 4.5 async await pattern
var task = await client.GetAsync(http://api.usa.gov/jobs/search.json?query=nursing+jobs);
var jsonString = await task.Content.ReadAsStringAsync();
model = JsonConvert.DeserializeObject<List<Job>>(jsonString);
returnView(model);
}
你需要引入 System.Threading.Tasks
命名空间。
注意: 在 .Content
上没有可用的 .ReadAsString
方法,这就是我使用 .ReadAsStringAsync
方法的原因。
ReadAsAsync<Job[]>()
吗? - svickReadAsAsync()
中的类型不能改变它之前的代码行为。 - svick