how to add return value in xamarin picker option

Question

hey i want to know how i can return a value in picker option.

this is my code:

   namespace App1 {   
     
   public partial class MainPage : ContentPage {  
     
       List<courses> myData = new List<courses>();  
       
     
       public MainPage()  
       {  
     
           InitializeComponent();  
     
     
   // i dont want to use This its working fine  
     
         MainPicker.Items.Add("String");  
             
   // Currently using this in my app but now i want when i select course name from picker option then picker should automatically select key behind the course name so i can generate key using button.  
     
           myData.Add(new Courses  
           {  
     
               Course= "ABC",  
               Key= "Custom Key"  
     
           });  
     
           MainPicker.ItemsSource = myData;  
     
       }  
     
     
       private void Button_Clicked(object sender, EventArgs e)  
       {  
     
           richbox.Text = Convert.ToBase64String(this.AES_Encrypt(Encoding.ASCII.GetBytes(hardwareid.Text + "," + MainPicker.SelectedItem), "Custom Key"));  
     
       }  
     
     
   //Now here picker showing course name but its not generating correct key when i click button  
     
       private void MainPicker_SelectedIndexChanged(object sender, EventArgs e)  
       {  
     
           var item = MainPicker.Items[MainPicker.SelectedIndex];  
   }  

XAML code:

   <Picker Title="Choose a Course"  
     
             ItemDisplayBinding="{Binding Course}"  
     
             SelectedIndexChanged="MainPicker_SelectedIndexChanged"  
               x:Name="MainPicker">  
                  
           </Picker>  

///Using AES256 All are working fine but stuck
on key value should be return with hardwareid.Text both when i click button, I dont mention encryption and decryption code here all other are working fine.

also use this code but no luck

// var key = ((Courses)MainPicker.SelectedItem).Key;

Answer 1

Hello,

Now here picker showing course name but its not generating correct key when i click button

You need to get the selectitem by myData[selectedIndex] in the MainPicker_SelectedIndexChanged, then you can get the key from the selectitem like following code.

   private void MainPicker_SelectedIndexChanged(object sender, EventArgs e)  
           {  
               var picker = (Picker)sender;  
               int selectedIndex = picker.SelectedIndex;  
               if (selectedIndex != -1)  
               {  
                   Courses result = myData[selectedIndex];  
                   string keyValue=result.Key;               
               }  
           }  

Best Regards,

Leon Lu

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