Added comments to improve readability in MainPage.xaml.cs

10.0/Apps/Weather/Weather/MainPage.xaml.cs

@@ -1,36 +1,62 @@
-namespace Weather;
+namespace Weather;
 
+// MainPage represents the main screen of the weather app
 public partial class MainPage : ContentPage
 {
+    // Service used to fetch weather data from API
     RestService _restService;
 
+    // Constructor required to initializes UI components and services
     public MainPage()
     {
         InitializeComponent();
+
+        // Create instance of RestService
         _restService = new RestService();
     }
 
+    // This method runs when the "Get Weather" button is clicked
     async void OnGetWeatherButtonClicked(object sender, EventArgs e)
     {
+        // Check if API key is missing or not set
         if (string.IsNullOrWhiteSpace(Constants.OpenWeatherMapAPIKey) || Constants.OpenWeatherMapAPIKey == "YOUR_API_KEY")
         {
-            await DisplayAlertAsync("API Key Missing", "Please set your OpenWeatherMap API key in Constants.OpenWeatherMapAPIKey.", "OK");
+            await DisplayAlertAsync(
+                "API Key Missing",
+                "Please set your OpenWeatherMap API key in Constants.OpenWeatherMapAPIKey.",
+                "OK"
+            );
             return;
         }
+
+        // Ensure user has entered a city name or its left blank
         if (!string.IsNullOrWhiteSpace(_cityEntry.Text))
         {
+            // Build request URL
             string requestUri = GenerateRequestUri(Constants.OpenWeatherMapEndpoint);
+
+            // Call API and get weather data
             WeatherData? weatherData = await _restService.GetWeatherData(requestUri);
+
+            // Bind data to UI
             BindingContext = weatherData;
         }
     }
 
+    // Builds the API request URL with city, units, and API key
     string GenerateRequestUri(string endpoint)
     {
         string requestUri = endpoint;
+
+        // Add city name to query
         requestUri += $"?q={_cityEntry.Text}";
-        requestUri += "&units=imperial"; // or units=metric
-        requestUri += $"&appid={Constants.OpenWeatherMapAPIKey}"; // changed to lowercase 'appid'
+
+        // Set temperature unit (imperial = Fahrenheit, metric = Celsius)
+        requestUri += "&units=imperial";
+
+        // Add API key for authentication
+        requestUri += $"&appid={Constants.OpenWeatherMapAPIKey}";
+
         return requestUri;
     }
 }