Xamarin 天蓝色 InvokeAsyncApi

Question

我目前正在学习 Xamarin 表单的不同解决方法。我创建了一个搜索天气信息并发送 HTTPResponseMessage 的 Web 服务。每次调用 API.

时，我总是收到未找到的错误

I change the route on the API and now I get a JSON parse error:

public async Task<string> weather(){
        var parameters = new Dictionary<string, string>{ 
            {"lat", "33.92649137"}, {"lon", "-83.343567"}
        };

        try{
            var xml = await MobileService.InvokeApiAsync<string>("GetWeather", HttpMethod.Get, parameters);
            return xml;
        }catch (Exception e){
            DisplayAlert ("Error", e.ToString(), "Close");
            return "Failed";
        }


    }

我的网络服务api:

    namespace MobileWeather.Controllers
{
    public class TestController : TableController<Weather>
    {
        protected override void Initialize(HttpControllerContext controllerContext)
        {
            base.Initialize(controllerContext);
            MobileServiceContext context = new MobileServiceContext();
            DomainManager = new EntityDomainManager<Weather>(context, Request, Services);
        }

        public IQueryable<Weather> GetAllTodoItems()
        {
            return Query();
        }

        /// <summary>
        /// Get the weather information for a location based on the longitude and latitude values.
        /// </summary>
        /// <param name="lat">The latitude of the project site.</param>
        /// <param name="lon">The longitude of the project site.</param>
        [HttpGet]
        [Route("api/GetWeather")]
        public async Task<HttpResponseMessage> GetWeather(string lon, string lat)
        {

            HttpClient client = new HttpClient();
            client.BaseAddress = new Uri("http://forecast.weather.gov/MapClick.php");
            string uri = "http://forecast.weather.gov/MapClick.php?lat=" + lat + "&lon=" + lon + "&FcstType=dwml";

            //create a weather item.
            Weather weather = new Weather();

            HttpResponseMessage response = await client.GetAsync(uri);

            XDocument xml = new XDocument(); 
            xml = XDocument.Parse(await response.Content.ReadAsStringAsync(), LoadOptions.None);

            /*
            weather.Temperature = Convert.ToInt32( xml.Descendants("temperature").Descendants("value").ElementAt(0).Value);
            weather.Lon = lon;
            weather.Lat = lat;
            weather.Precipitation = Convert.ToInt32(xml.Descendants("probability-of-precipitation").Descendants("value").ElementAt(0).Value);
            weather.Forecast = xml.Descendants("wordedForecast").Descendants("text").ElementAt(0).Value;
            weather.Hazard = xml.Descendants("hazards").Descendants("hazard-conditions").ElementAt(0).Value;
            weather.DateAndTime = DateTime.Now;
            */
            //query for the data we want!

            return new HttpResponseMessage()
            {

                Content = response.Content
            };

        }

        public HttpResponseMessage Post()
        {
            return new HttpResponseMessage()
            {
                Content = new StringContent("POST: Test message")
            };
        }

        public HttpResponseMessage Put()
        {
            return new HttpResponseMessage()
            {
                Content = new StringContent("PUT: Test message")
            };
        }

    }
    }

更新 => 我将 GetWeather 方法上的路线更改为 [Route("api/GetWeather")]，现在出现解析错误。

Answer 1

好的，它会看到需要指向 api/GetWeather 的路由，以便我的移动客户端找到它。至于解析错误，我会在 Azure 从宕机状态恢复后第一时间修复它。到目前为止，错误似乎是因为 InvokeApiAsync 默认需要一个 JSON 对象，而我正在使用 HTTPResponseMessage 进行响应。

Xamarin 天蓝色 InvokeAsyncApi

Xamarin azure InvokeAsyncApi

.net

c#

azure

xamarin

xamarin.forms