如何在 Windows 8 应用程序的数据绑定应用程序中从 url 添加 json

Question

我想在我正在使用的 Visual Basic 2013 中的数据绑定应用程序中添加来自 url 的 json .....但我找不到任何方法可以做到这一点。

。我想从 json url
添加数据 .第二个我还想展示图片
.左边是图片，右边是文字。

JSON 示例是：

{"worldpopulation":[{"titlejson":"Bullish trend observed in KSE with 300 points increase","titledesc":25695,"flag":""}]} 

我如何将该 json 获取到 windows phone

我想在MainViewmodel.cs这个页面加载数据

    public void LoadData()
        {
            // Sample data; replace with real data
            this.Items.Add(new ItemViewModel() { ID = "0", LineOne = "runtime one", LineTwo = "Maecenas praesent accumsan bibendum", LineThree = "Facilisi faucibus habitant inceptos interdum lobortis nascetur pharetra placerat pulvinar sagittis senectus sociosqu" });

            this.Items.Add(new ItemViewModel() { ID = "0", LineOne = "runtime one", LineTwo = "Maecenas praesent accumsan bibendum", LineThree = "Facilisi faucibus habitant inceptos interdum lobortis nascetur pharetra placerat pulvinar sagittis senectus sociosqu" });

            this.IsDataLoaded = true;
        }

Answer 1

您需要有适合您的 json 结果的模型。

模型对应你的json结果

您可以使用json2csharp生成模型

public class Worldpopulation
{
  public string titlejson { get; set; }
  public int titledesc { get; set; }
  public string flag { get; set; }
}

 public class RootObject 
{
  public List<Worldpopulation> worldpopulation { get; set; }
}

您的视图模型加载数据方法应使用 HttpClient 调用 Web 服务以获取您的 json 结果。它将反序列化到您的模型，然后您可以转移到您的视图模型

LoadData()Method 数据消费服务

 using (HttpClient client = new HttpClient())
            {

                client.BaseAddress = new Uri("http://api.openweathermap.org");

                var url = "data/2.5/forecast/daily?q={0}&mode=json&units=metric&cnt=7";

                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

                HttpResponseMessage response = await client.GetAsync(url);

                if (response.IsSuccessStatusCode)
                {
                    var data = response.Content.ReadAsStringAsync();
                    var yourResult= JsonConvert.DeserializeObject<RootObject>(data.Result.ToString());
                }
           //Code to map to your view-model object and bind them to view

            }