Styjun

Hi I am trying to parse XML in my xamarin.forms app.The xml data contains one transactionID and couple of questions with multiple answers. What Iam trying to achieve is Bind the questions in to label and and answers into dropdowns in a listview.

The XML Iam getting from API

<?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>

How Iam parsing it

 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

My Data Model

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

My List View

 <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

>

How Can I bind these questions and answers to picker and label. Any help appreciated.

1) For your first question,

Below are the class models to parse your xml,

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; 

And by using LINQ to XML you can parse your xml to above class models like,

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) For your second question,

Now you can create one ObservableCollection for above query result and bind it to list view in your xamarin form like

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

Now tranzactionsOC is your ObservableCollection and you can bind it to your xamarin form