我的UWP应用程序中的超链接按钮和Json Uri

Question

我从Json文件解析文本图像和URI，但是当我解析URI并在超链接按钮的xaml页面中调用它时，什么也没有发生。请，如果任何人能告诉我一下这个代码也许会告诉我是否应该将字符串转换为URI（Common_sense_media，Metacritic的）或逆或者告诉我怎样做才能使其工作

public sealed partial class MainPage : Page 
{ 
    public MainPage() 
    { 
     this.InitializeComponent(); 
     jsonCall(); 
    } 



    public static BitmapImage ImageFromRelativePath(FrameworkElement parent, string path) 
    { 
     var uri = new Uri(parent.BaseUri, path); 
     BitmapImage result = new BitmapImage(); 
     result.UriSource = uri; 
     return result; 
    } 





    public async void jsonCall() 
    { 
     List<Result> listResult = new List<Result>(); 

     var client = new HttpClient(); 
     String jsonString = await client.GetStringAsync(new Uri("http://api-public.guidebox.com/v1.43/Tunisia/rKgEWJbFg0kgEHrcGXPKhPDo0XtTafyC/movies/all/250/250")); 
     System.Diagnostics.Debug.WriteLine(JsonValue.Parse(jsonString).ValueType); 
     JsonObject root = JsonValue.Parse(jsonString).GetObject(); 
     JsonArray res = root.GetNamedArray("results"); 

     for (uint i = 0; i < res.Count; i++) 
     { 
      JsonObject con = res.GetObjectAt(i); 
      String id = con.GetNamedNumber("id").ToString(); 
      String title = con.GetNamedString("title"); 
      string release_year = con.GetNamedNumber("release_year").ToString(); 
      string themoviedb = con.GetNamedNumber("themoviedb").ToString(); 
      string original_title = con.GetNamedString("original_title"); 
      JsonArray alt = con.GetNamedArray("alternate_titles"); 
      String name = "-"; 
      if (alt.Count != 0) { 
      name = alt.GetStringAt(0); 
      for (uint j = 1; j < alt.Count; j++) 
      { 
       name = name + ", " + alt.GetStringAt(j); 
      } 
      } 
      string imdb = con.GetNamedString("imdb"); 
      string pre_order = con.GetNamedBoolean("pre_order").ToString(); 
      string in_theaters = con.GetNamedBoolean("in_theaters").ToString(); 
      string release_date = con.GetNamedString("release_date"); 
      string rating = con.GetNamedString("rating"); 
      string rottentomatoes = con.GetNamedNumber("rottentomatoes").ToString(); 
      string freebase = con.GetNamedString("freebase"); 
      string wikipedia_id = con.GetNamedNumber("wikipedia_id").ToString(); 
      //System.Diagnostics.Debug.WriteLine("------------------------------"+con.GetNamedValue("metacritic").ValueType); 

      // string metacritic = con.GetNamedString("metacritic"); 
      //  MediaElement metacritic= VideoFromRelativePath(this, con.GetNamedValue("metacritic").ValueType.ToString()); 
      string common_sense_media = con.GetNamedValue("common_sense_media").ToString(); 
      string metacritic = con.GetNamedValue("metacritic").ToString(); 

      // Uri Common_sense_media = con.GetNamedValue("Common_sense_media").ToString(); 
      // string Common_sense_media = con.GetNamedValue("Common_sense_media").ToString(); 
      //string Common_sense_media = con.GetNamedString("metacritic"); 
      //System.Diagnostics.Debug.WriteLine("-------------"+Common_sense_media); 
      BitmapImage Poster_120x171 = ImageFromRelativePath(this, con.GetNamedString("poster_120x171")); 
      BitmapImage poster_240x342 = ImageFromRelativePath(this, con.GetNamedString("poster_240x342")); 
      BitmapImage poster_400x570 = ImageFromRelativePath(this, con.GetNamedString("poster_400x570")); 
      list.Items.Add(new Result {Id=id,Title=title,Themoviedb=themoviedb,Original_title=original_title,Alternate_titles=name, 
       Imdb=imdb,Pre_order=pre_order,In_theaters=in_theaters,Release_date=release_date, 
       Rating=rating, Rottentomatoes=rottentomatoes,Freebase=freebase,Wikipedia_id=wikipedia_id, 

       Common_sense_media = common_sense_media, 
       Metacritic= metacritic, 
       Poster = Poster_120x171, Poster_240x342=poster_240x342,Poster_400x570=poster_400x570}); 


     } 

    } 
} 
} 

我的XAML代码：

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"> 

    <ListView 
     Name="list" 
     DataContext="{Binding}"> 
     <ListView.ItemTemplate> 
      <DataTemplate> 
       <StackPanel 
        HorizontalAlignment="Stretch" 
        VerticalAlignment="Stretch" 
        Orientation="Vertical"> 

        <Image Source="{Binding Poster}" Width="100" Height="100"/> 
        <TextBlock 
         Name="id" 
         Text="{Binding Id}" /> 

        <TextBlock 
         Name="title" 
         Text="{Binding Title}" /> 

        <TextBlock 
         Name="release_year" 
         Text="{Binding Release_year}" /> 
        <TextBlock 
         Name="themoviedb" 
         Text="{Binding Themoviedb}" /> 
        <TextBlock 
         Name="original_title" 
         Text="{Binding Original_title}" /> 
        <TextBlock 
         Name="alternate_titles" 
         Text="{Binding Alternate_titles}" /> 
        <TextBlock 
         Name="imdb" 
         Text="{Binding Imdb}" /> 
        <TextBlock 
         Name="pre_order" 
         Text="{Binding Pre_order}" /> 
        <TextBlock 
         Name="in_theaters" 
         Text="{Binding In_theaters}" /> 
        <TextBlock 
         Name="release_date" 
         Text="{Binding Release_date}" /> 
        <HyperlinkButton Content="Common_sense_media" NavigateUri= "{Binding Common_sense_media}"/> 
        <HyperlinkButton Content="metacritic" NavigateUri= "{Binding metacritic}"/> 
        <TextBlock 
         Name="rating" 
         Text="{Binding Rating}" /> 
        <TextBlock 
         Name="rottentomatoes" 
         Text="{Binding Rottentomatoes}" /> 
        <TextBlock 
         Name="freebase" 
         Text="{Binding Freebase}" /> 
        <TextBlock 
         Name="wikipedia_id" 
         Text="{Binding Wikipedia_id}" /> 

        <TextBlock 
         Name="common_sense_media" 
         Text="{Binding Common_sense_media}" /> 
        <TextBlock 
         Name="poster_120x171" 
         Text="{Binding Poster_120x171}" /> 
        <Image Source="{Binding Poster_240x342}" Width="100" Height="100"/> 
        <Image Source="{Binding Poster_400x570}" Width="100" Height="100"/> 





       </StackPanel> 
      </DataTemplate> 
     </ListView.ItemTemplate> 
    </ListView> 



</Grid> 

Answer 1

因为你得到了common_sense_media值包含在启动额外的双引号，并最终像"\"https://www.commonsensemedia.org/movie-reviews/magic-mike\""。所以，你应该用Trim，改变代码如下

string common_sense_media = con.GetNamedValue("common_sense_media").ToString().TrimStart('"').TrimEnd('"'); 
string metacritic = con.GetNamedValue("metacritic").ToString().TrimStart('"').TrimEnd('"'); 

有些链接仍这个更新后无法访问删除它们，这是因为你的HttpRequest为common_sense_media和metacritic返回结果为空。对于这种情况，请按照您的要求处理它们。你可以简单判断

if(common_sense_media==null || metacritic==null) 
{ 
    //Do what you want do deal with them, such as give a default link 
} 

Answer 2

HyperLinkBut​​ton给定的字符串没有正确的URL格式。双引号（""）在字符串的每一端添加。所以，如果你注意到你得到了BindingExpressionError（Error: Converter failed to convert value of type 'Windows.Foundation.String' to type 'Uri'; BindingExpression: Path='Common_sense_media' DataItem='test1.Result, test1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; target element is 'Windows.UI.Xaml.Controls.HyperlinkButton' (Name='null'); target property is 'NavigateUri' (type 'Uri').）

使用Newtonsoft.Json包进行JSON解析。它具有JsonPropertyAttribute，它允许您指定Json属性的名称，指示Newtonsoft.Json.JsonSerializer始终使用指定名称序列化该成员。这里是tutorial的链接。您必须将[JsonProperty(keyname)]添加到所有属性。图书馆将deserialse JSON你 与代码Result resu = Newtonsoft.Json.JsonConvert.DeserializeObject<Result>(con.ToString())

只有一行下面是简单的配对码

 public class Result 
      { 
       //public string Alternate_titles { get; set; } 
       //public string Common_sense_media { get; set; } 
       //public string Freebase { get; set; } 
       //public string Id { get; set; } 
       //public string Imdb { get; set; } 
       //public string In_theaters { get; set; } 
       //public string Metacritic { get; set; } 
       //public string Original_title { get; set; } 
       //public BitmapImage Poster { get; set; } 
       //public BitmapImage Poster_240x342 { get; set; } 
       //public BitmapImage Poster_400x570 { get; set; } 
       //public string Pre_order { get; set; } 
       //public string Rating { get; set; } 
       //public string Release_date { get; set; } 
       //public string Rottentomatoes { get; set; } 
       //public string Themoviedb { get; set; } 
       //public string Title { get; set; } 
       //public string Wikipedia_id { get; set; } 
    //declare all above properties like below using JsonProperty 
       [JsonProperty("common_sense_media")] 
       public string Common_sense_media 
       { 
        get; set; 

       } 
      [JsonProperty("poster_120x171")] 
     public string Poster { get; set; } 
     [JsonProperty("poster_240x342")] 
     public string Poster_240x342 { get; set; } 
     [JsonProperty("poster_400x570")] 
     public string Poster_400x570 { get; set; } 
      } 


    public async void jsonCall() 
      { 
       List<Result> listResult = new List<Result>(); 

       var client = new HttpClient(); 
       String jsonString = await client.GetStringAsync(new Uri("http://api-public.guidebox.com/v1.43/Tunisia/rKgEWJbFg0kgEHrcGXPKhPDo0XtTafyC/movies/all/250/250")); 
       System.Diagnostics.Debug.WriteLine(JsonValue.Parse(jsonString).ValueType); 
       JsonObject root = JsonValue.Parse(jsonString).GetObject(); 
       JsonArray res = root.GetNamedArray("results"); 

       for (uint i = 0; i < res.Count; i++) 
       { 
        JsonObject con = res.GetObjectAt(i); 
        Result resu =   Newtonsoft.Json.JsonConvert.DeserializeObject<Result>(con.ToString()); 
          list.Items.Add(resu); 
       } 
     }