Xamarin形式。无法在列表中显示json对象
我完全是xamarin形式的。我正在尝试制作一个使用TMDB api来显示电影列表的应用程序，但出现此异常：
Newtonsoft.Json.JsonSerializationException：无法将当前JSON对象（例如{“ name”：“ value”}）反序列化为类型'System.Collections.Generic.List`1 [CinemaApp.Models.NowPlaying]'，因为该类型需要JSON数组（例如[1,2,3]）才能正确反序列化。
这是我的xaml文件
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="CinemaApp.PlayingNowPage">
<ContentPage.Content>
<AbsoluteLayout HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
<StackLayout x:Name="SLMovies" AbsoluteLayout.LayoutFlags="All"
AbsoluteLayout.LayoutBounds="0,0,1,1">
<ListView x:Name="MoviesListView"
HasUnevenRows="True"
SeparatorVisibility="None">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<Frame>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.4*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Image Source="{Binding full_poster_path}" Grid.Column="0"
HeightRequest="120"
WidthRequest="150"/>
<StackLayout Grid.Column="1">
<Label Text="{Binding title}"
TextColor="#E91E63"
FontAttributes="Bold"/>
<Label Text="{Binding vote_average}"/>
<Label Text="{Binding release_date}">
</Label>
<StackLayout
Orientation="Horizontal"
HorizontalOptions="FillAndExpand">
<Label HorizontalOptions="EndAndExpand"
Text="{Binding Duration}">
</Label>
</StackLayout>
</StackLayout>
</Grid>
</Frame>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
<StackLayout
x:Name="SLLoader"
IsVisible="True"
Padding="12"
AbsoluteLayout.LayoutFlags="PositionProportional"
AbsoluteLayout.LayoutBounds="0.5,0.5,-1,-1">
<ActivityIndicator
IsRunning="True"
Color="#00000000"/>
<Label
Text="Loading..."
HorizontalOptions="Center"
TextColor="Red"/>
</StackLayout>
</AbsoluteLayout>
</ContentPage.Content>
</ContentPage>
这是对象的类
using System;
using System.Collections.Generic;
using System.Text;
namespace CinemaApp.Models
{
public class NowPlaying
{
public int id { get; set; }
public bool video { get; set; }
public double vote_average { get; set; }
public string title { get; set; }
public string poster_path { get; set; }
public string original_title { get; set; }
public string release_date { get; set; }
public string full_poster_path
{
get
{
if (string.IsNullOrEmpty(poster_path))
{
return string.Empty;
}
return string.Format("https://image.tmdb.org/t/p/w185/" +
poster_path);
}
}
}
}
这是主要类别：
namespace CinemaApp
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class PlayingNowPage : ContentPage
{
public PlayingNowPage ()
{
InitializeComponent ();
GetMovies();
}
private async void GetMovies()
{
try
{
SLLoader.IsVisible = true;
HttpClient client = new HttpClient();
var response = await client.GetStringAsync(
"https://api.themoviedb.org/3/movie/now_playing?
api_key=XXXX&language=en-US&page=1");
var movies = JsonConvert.DeserializeObject<List<NowPlaying>>
(response);
Console.WriteLine("rere "+movies);
MoviesListView.ItemsSource = movies;
}
catch (Exception e)
{
Console.WriteLine("Error: " + e);
}
finally
{
SLLoader.IsVisible = false;
}
}
}
}
1 个答案:
答案 0 :(得分：0)
您的NowPlaying模型在一个正在播放的结果中仅包含对象的数据。如果您查看响应，例如网站上的示例：https://developers.themoviedb.org/3/movies/get-now-playing
{
"page": 1,
"results": [
{
"poster_path": "/e1mjopzAS2KNsvpbpahQ1a6SkSn.jpg",
"adult": false,
"overview": "From DC Comics comes the Suicide Squad, an antihero team of incarcerated supervillains who act as deniable assets for the United States government, undertaking high-risk black ops missions in exchange for commuted prison sentences.",
"release_date": "2016-08-03",
"genre_ids": [
14,
28,
80
],
"id": 297761,
"original_title": "Suicide Squad",
"original_language": "en",
"title": "Suicide Squad",
"backdrop_path": "/ndlQ2Cuc3cjTL7lTynw6I4boP4S.jpg",
"popularity": 48.261451,
"vote_count": 1466,
"video": false,
"vote_average": 5.91
},
{
"poster_path": "/lFSSLTlFozwpaGlO31OoUeirBgQ.jpg",
"adult": false,
"overview": "The most dangerous former operative of the CIA is drawn out of hiding to uncover hidden truths about his past.",
"release_date": "2016-07-27",
"genre_ids": [
28,
53
],
"id": 324668,
"original_title": "Jason Bourne",
"original_language": "en",
"title": "Jason Bourne",
"backdrop_path": "/AoT2YrJUJlg5vKE3iMOLvHlTd3m.jpg",
"popularity": 30.690177,
"vote_count": 649,
"video": false,
"vote_average": 5.25
},
{
"poster_path": "/tgfRDJs5PFW20Aoh1orEzuxW8cN.jpg",
"adult": false,
"overview": "Arthur Bishop thought he had put his murderous past behind him when his most formidable foe kidnaps the love of his life. Now he is forced to travel the globe to complete three impossible assassinations, and do what he does best, make them look like accidents.",
"release_date": "2016-08-25",
"genre_ids": [
80,
28,
53
],
"id": 278924,
"original_title": "Mechanic: Resurrection",
"original_language": "en",
"title": "Mechanic: Resurrection",
"backdrop_path": "/3oRHlbxMLBXHfMqUsx1emwqiuQ3.jpg",
"popularity": 20.375179,
"vote_count": 119,
"video": false,
"vote_average": 4.59
},
{
"poster_path": "/3ioyAtm0wXDyPy330Y7mJAJEHpU.jpg",
"adult": false,
"overview": "A high school senior finds herself immersed in an online game of truth or dare, where her every move starts to be manipulated by an anonymous community of \"watchers.\"",
"release_date": "2016-07-27",
"genre_ids": [
18,
53
],
"id": 328387,
"original_title": "Nerve",
"original_language": "en",
"title": "Nerve",
"backdrop_path": "/a0wohltYr7Tzkgg2X6QKBe3txj1.jpg",
"popularity": 7.17729,
"vote_count": 86,
"video": false,
"vote_average": 6.84
},
{
"poster_path": "/3S7V2Jd2G61LltoCsYUj4GwON5p.jpg",
"adult": false,
"overview": "A woman with a seemingly perfect life - a great marriage, overachieving kids, beautiful home, stunning looks and still holding down a career. However she's over-worked, over committed and exhausted to the point that she's about to snap. Fed up, she joins forces with two other over-stressed moms and all go on a quest to liberate themselves from conventional responsibilities, going on a wild un-mom like binge of freedom, fun and self-indulgence - putting them on a collision course with PTA Queen Bee Gwendolyn and her clique of devoted perfect moms.",
"release_date": "2016-07-28",
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35
],
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"original_language": "en",
"title": "Bad Moms",
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"popularity": 6.450367,
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"video": false,
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"adult": false,
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12,
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],
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],
"dates": {
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},
"total_pages": 33,
"total_results": 649
}
您看到它包装在results对象中。因此，您将需要以下内容：
public class RootObject
{
public NowPlaying[] Results { get; set; }
}
然后反序列化为RootObject。 quicktype.io是获取JSON对象结构的绝佳工具。或者，甚至可以将其烘焙到Visual Studio（仅Windows）中。复制JSON对象，然后转到编辑> 特殊粘贴> 将JSON作为类粘贴
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