Question

我启动了一个新应用程序，该应用程序使用Omdb API检索电影信息。该应用程序的目标是使用搜索关键字来检索电影标题。例如：“ shawshank”应返回：

{"Search":[{"Title":"The Shawshank Redemption","Year":"1994","imdbID":"tt0111161","Type":"movie","Poster":"https://m.media-amazon.com/images/M/MV5BMDFkYTc0MGEtZmNhMC00ZDIzLWFmNTEtODM1ZmRlYWMwMWFmXkEyXkFqcGdeQXVyMTMxODk2OTU@._V1_SX300.jpg"},{"Title":"Shawshank: The Redeeming Feature","Year":"2001","imdbID":"tt0293927","Type":"movie","Poster":"https://m.media-amazon.com/images/M/MV5BYjgwMjNjOGUtNzU3MC00MGM5LTk4NTctNGI5N2I2NGI0YjBhXkEyXkFqcGdeQXVyMjIzMTk0MzM@._V1_SX300.jpg"},{"Title":"Hope Springs Eternal: A Look Back at 'The Shawshank Redemption'","Year":"2004","imdbID":"tt0443041","Type":"movie","Poster":"N/A"},{"Title":"The Shawshank Redemption: Cast Interviews","Year":"2004","imdbID":"tt5443390","Type":"movie","Poster":"N/A"},{"Title":"The Shawshank Redemption (Scene)","Year":"2012","imdbID":"tt2477746","Type":"movie","Poster":"N/A"},{"Title":"The Shawshank Reflection","Year":"2015","imdbID":"tt3882670","Type":"movie","Poster":"N/A"},{"Title":"The Shawshank Redemption: Behind the Scenes","Year":"2004","imdbID":"tt5443386","Type":"movie","Poster":"N/A"}],"totalResults":"7","Response":"True"}

问题是，一旦我运行表单应用程序，我就会尝试将JSON保存到对象中，前提是假设如果我的对象参数名称相同（不区分大小写），则JSON项将保存到对象内部的相应变量中。由于对象参数保持为空，因此不会发生这种情况。

此代码是通过跟随一个有关制作一个使用API提取在线漫画的应用的youtube视频制作的。我想改为从Omdb中提取电影标题。使用的Nuget是：Microsoft.AspNet.WebApi.Client v5.2.7和Newtonsoft.Json v12.0.2。用于制作视频的视频链接如下： https://www.youtube.com/watch?v=aWePkE2ReGw

我尝试在浏览器中测试我的网址，它成功生成了所需的JSON。我还尝试单步执行代码并观察变量，发现没有成功从url提取数据。我对建立HTTP连接以及使用API都很陌生，因此可能很容易解决。运行代码后，正在监视的变量的结果如下：

Name              Value               Type
Title           "MainWindow"          string
movie   {Movie_application.MovieModel}  Movie_application.MovieModel
Film.Title     null               string
url"http://www.omdbapi.com/?s=shawshank&apikey=568027e4" string
Tag            null               object
Title           "MainWindow"             string
Film    {Movie_application.MovieModel}  Movie_application.MovieModel
titlee             null                 string

mainwindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;


namespace Movie_application
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {

        public MainWindow()
        {
            InitializeComponent();
            //Start up the tcp/ip connection via HTTPclient 
            APIhelper.InitializeClient();
        }

        private async Task LoadResponseText(string Tag)
        {
            //grab the movie and put it in a local variable
            var Film = await MovieProcessor.LoadMovie(Tag);
            //create the full url of the poster 
            //var uriSource = new Uri(Film.Poster, UriKind.Absolute);
            //create a bitmap image out of url and put it in the display of the WP window
            //MoviePoster.Source = new BitmapImage(uriSource);

            Result_Text.Text = Film.Title;

        }

        private async void Window_Loaded(object sender, RoutedEventArgs e)
        {
            await LoadResponseText("shawshank");
        }

        private async void SearchBtn_Click(object sender, RoutedEventArgs e)
        {
            await LoadResponseText(SearchBox.Text);
        }
    }
}



```APIhelper```

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Net.Http;
    using System.Net.Http.Headers;
    using System.Text;
    using System.Threading.Tasks;

    namespace Movie_application
    {
        public class  APIhelper
        {
            public static HttpClient ApiClient { get; set; }

            public static void InitializeClient()
            {
                //Create a new HttpClient object
                ApiClient = new HttpClient();
                //Clear headers out of HttpClient
                ApiClient.DefaultRequestHeaders.Accept.Clear();
                //Adds a header which requests a JSON data rather than web page tags etc.
                ApiClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            }
        }
    }

```MovieProcessor```

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Net.Http;
    using System.Text;
    using System.Threading.Tasks;

    namespace Movie_application
    {
        public class MovieProcessor
        {


            public static async Task<MovieModel> LoadMovie(string search)
            {
                string url = "http://www.omdbapi.com/?s=" + search + "&apikey=568027e4";
                //call HTTPclient to open connection and await a response from destination
                using (HttpResponseMessage response = await APIhelper.ApiClient.GetAsync(url))
                {
                    if (response.IsSuccessStatusCode)
                    {
                        //read in the response data in an asynch fashion 
                        MovieModel movie = await response.Content.ReadAsAsync<MovieModel>();
                        string titlee = movie.Title;
                        return movie;
                    }
                    else
                    {
                        throw new Exception(response.ReasonPhrase);
                    }
                }
            }
        }
    }

    ```MovieModel```
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;

    namespace Movie_application
    {
        public class MovieModel
        {
            public string Title  { get; set; }
            public string Poster { get; set; }
        }
    }



I expect the code to be able to write "The Shawshank Redemption" onto the form text box. The text box remains empty at the end of the run. Thanks in advance.

Answer 1

实际上您在尝试将响应直接转换为MovieModel，而实际上根对象具有Search这样的数组字段。

{"Search":[...], "totalResults":"7", "Response":"True"}

因此，要解决此问题，您必须创建一个代表该根对象的模型，该模型具有一个名为Search的字段，该字段是MovieModel的数组。

然后更改MovieModel movie = await response.Content.ReadAsAsync<MovieModel>();以返回您创建的任何新模型

无法从Omdb API检索json并将其合并到我的电影类中，该对象内的所有参数均显示“空”

1 个答案: