Xml解析并绑定到Xamarin表单上的ListView

Question

嗨，我正在尝试在我的xamarin.forms应用程序中解析XML.xml数据包含一个transactionID和几个具有多个答案的问题。 Iam想要实现的是将问题绑定到标签中，并将答案绑定到列表视图的下拉列表中。

从API获取XML Iam

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<PlatformResponse>
  <TransactionDetails>
    <TransactId>39562</TransactionId>
  </TransactionDetails>
  <Response>
    <Questions>
      <Question type="1" text="Which one is correct?">
        <Answer correct="false">test1</Answer>
        <Answer correct="false">test2</Answer>
        <Answer correct="false">test3</Answer>
        <Answer correct="false">test4</Answer>
        <Answer correct="false">test5</Answer>
        <Answer correct="false">test5</Answer>  
      </Question>
      <Question type="2" text="Which one is associated with you?">
        <Answer correct="false">test1</Answer>
        <Answer correct="false">test2</Answer>
        <Answer correct="false">test3</Answer>
        <Answer correct="false">test4</Answer>
        <Answer correct="false">test5</Answer>
        <Answer correct="false">test5</Answer> 
      </Question>
      <Question type="3" text="Which one of the following is true ?">
         <Answer correct="false">test1</Answer>
        <Answer correct="false">test2</Answer>
        <Answer correct="false">test3</Answer>
        <Answer correct="false">test4</Answer>
        <Answer correct="false">test5</Answer>
        <Answer correct="false">test5</Answer> 
      </Question>
    </Questions>
  </Response>
</PlatformResponse>

我如何解析它

 HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
                    webRequest.ProtocolVersion = HttpVersion.Version10;
                    webRequest.Method = "POST";
                    webRequest.ContentType = "text/xml charset=utf8";
                    webRequest.ContentLength = postData.Length;
                    Stream requestStream = webRequest.GetRequestStream();
                    requestStream.Write(postData, 0, postData.Length);
                    requestStream.Close();
                    HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
                    StreamReader reader = new StreamReader(webResponse.GetResponseStream());
                    string reader2 = reader.ReadToEnd();
                    List<XmlData> ObjXmlData = new List<XmlData>();
                    XDocument doc = XDocument.Parse(reader2);

           // How Can I bind it to the listview

我的数据模型

   public class XmlData
     {
          public string TransactionId { get; set; }
          public string Question { get; set; }
          public string Answer { get; set; }        
     }

我的列表视图

                <ListView  x:Name="QuestionsListView"  ItemsSource="{Binding}"
                     HasUnevenRows="True"                                                              
                     HorizontalOptions="FillAndExpand"
                     VerticalOptions="FillAndExpand">
                    <ListView.ItemTemplate>
                        <DataTemplate>
                            <ViewCell>
                                <ViewCell.View>
                                    <StackLayout>
                                        <StackLayout Orientation="Horizontal">
                                            <Label Text="•" FontSize="Medium" TextColor="Green" Margin="0,20,0,0"/>
                                            <Label Text="{Binding Question}" FontSize="Small" TextColor="#474747" Margin="0,20,0,0">                                               
                                            </Label>
                                           </StackLayout>
                                            <StackLayout Orientation="Horizontal" Margin="10,0,10,0" HorizontalOptions="FillAndExpand" >                                             
                                            <Picker x:Name="picker1" Title="Select answer" ItemDisplayBinding="{Binding Answer}" HorizontalOptions="FillAndExpand" FontSize="Small" TextColor="Gray">
                                            </Picker>
                                            <Image Source="downarrow.png" HorizontalOptions="End" HeightRequest="20" WidthRequest="20" ></Image>
                                        </StackLayout>
                                    </StackLayout>
                                </ViewCell.View>
                            </ViewCell>
                        </DataTemplate>
                    </ListView.ItemTemplate>
                </ListView

>

如何将这些问题和答案绑定到选择器和标签。 任何帮助表示赞赏。

Answer 1

1）对于第一个问题，

下面是解析您的xml的类模型，

class Answer
{
    public string Text { get; set; }
    public bool Correct { get; set; }
}

class Question
{
    public string Ques { get; set; }
    public string Type { get; set; }
    public List<Answer> Answers { get; set; }
}

class Tranzaction
{
    public string TransactionId { get; set; }
    public List<Question> Questions { get; set; }
}

通过使用LINQ to XML，您可以将xml解析为上述类模型，

XDocument doc = XDocument.Parse("Your xml text here");

List<Tranzaction> transactions = (from p in doc.Descendants("PlatformResponse")
              select new Tranzaction
              {
                  TransactionId = p?.Elements("TransactionDetails")?.FirstOrDefault()?.Element("TransactionId")?.Value.Trim(),
                  Questions = (from q in p?.Descendants("Questions")?.Elements("Question")
                               select new Question
                               {
                                   Ques = q?.Attribute("text")?.Value,
                                   Type = q?.Attribute("type")?.Value,
                                   Answers = (from a in q?.Elements("Answer")
                                              select new Answer
                                              {
                                                  Text = a?.Value,
                                                  Correct = Convert.ToBoolean(a?.Attribute("correct")?.Value)
                                              }).ToList()
                               }).ToList()

              }).ToList();

2）关于第二个问题，

现在，您可以为上述查询结果创建一个ObservableCollection并将其绑定到xamarin表单中的列表视图，例如

ObservableCollection<Tranzaction> tranzactionsOC = new ObservableCollection<Tranzaction>(transactions);

现在tranzactionsOC是您的ObservableCollection ，您可以将其绑定到您的xamarin表单