不显示数据REST获取xamarin表单

Posted 2021-04-25

当我得到显示响应时，我得到的只是一个空结果。我认为它可能是班级，因为我连接到http。有任何想法吗 ？谢谢 ！

public class info 
    {

        public class Text
        {
            public int userId { get; set; }
            public int id { get; set; }
            public string title { get; set; }
            public string body { get; set; }
        }

这是电话：

Device.BeginInvokeOnMainThread(async () =>
            {
                RestClient client = new RestClient();
                var apiresult = await client.Get<info>("https://jsonplaceholder.typicode.com/posts");


                if (apiresult != null)
                {

                    labelchange.Text = apiresult.Text.title;
                }

            });

和实际的REST

public class RestClient
    {
        public async Task <T> Get <T>(string url)

        {

            try
            {
                HttpClient client = new HttpClient();
                var response = await client.GetAsync(url);
                if (response.StatusCode == System.Net.HttpStatusCode.OK)
                {
                    var jsonstring = await response.Content.ReadAsStringAsync();
                    return Newtonsoft.Json.JsonConvert.DeserializeObject<T>(jsonstring);
                }
            }
            catch
            {

            }
            return default(T);
        }
    }

答案

传递给RestClient的对象类型不正确。从https://jsonplaceholder.typicode.com/posts返回的类型是List<Text>

因此，您应该更改以下行：

var apiresult = await client.Get<List<Text>>("https://jsonplaceholder.typicode.com/posts");

要访问结果中的成员，只需foreach循环结果中的项：

foreach (var info in apiresult)
{
    // Do something with info. e.g. info.userId, info.id...
}