Improved parameter handling.

SteamStorefrontAPI/Classes/appdetails/Achievements.cs

@@ -15,6 +15,11 @@ namespace SteamStorefrontAPI.Classes
         public long Total { get; set; }
 
         [JsonProperty("highlighted")]
-        public List<Highlighted> Highlighted { get; set; }
+        public List<Highlighted> Highlighted { get; }
+
+        public Achievements()
+        {
+            this.Highlighted = new List<Highlighted>();
+        }
     }
 }

SteamStorefrontAPI/Classes/appdetails/Movie.cs

@@ -21,10 +21,15 @@ namespace SteamStorefrontAPI.Classes
         public string Thumbnail { get; set; }
 
         [JsonProperty("webm")]
-        public Dictionary<string, string> Webm { get; set; }
+        public Dictionary<string, string> Webm { get; }
 
         [JsonProperty("highlight")]
         public bool Highlight { get; set; }
+
+        public Movie()
+        {
+            this.Webm = new Dictionary<string, string>();
+        }
     }
 
 }

SteamStorefrontAPI/Classes/appdetails/PackageGroup.cs

@@ -34,6 +34,11 @@ namespace SteamStorefrontAPI.Classes
         public string IsRecurringSubscription { get; set; }
 
         [JsonProperty("subs")]
-        public List<Sub> Subs { get; set; }
+        public List<Sub> Subs { get; }
+
+        public PackageGroup()
+        {
+            this.Subs = new List<Sub>();
+        }
     }
 }

SteamStorefrontAPI/Classes/appdetails/SteamApp.cs

@@ -61,34 +61,34 @@ namespace SteamStorefrontAPI.Classes
         public string LegalNotice { get; set; }
 
         [JsonProperty("developers")]
-        public List<string> Developers { get; set; }
+        public List<string> Developers { get; }
 
         [JsonProperty("publishers")]
-        public List<string> Publishers { get; set; }
+        public List<string> Publishers { get; }
 
         [JsonProperty("price_overview")]
         public PriceOverview PriceOverview { get; set; }
 
         [JsonProperty("packages")]
-        public List<long> Packages { get; set; }
+        public List<long> Packages { get;  }
 
         [JsonProperty("package_groups")]
-        public List<PackageGroup> PackageGroups { get; set; }
+        public List<PackageGroup> PackageGroups { get; }
 
         [JsonProperty("platforms")]
         public Platforms Platforms { get; set; }
 
         [JsonProperty("categories")]
-        public List<Category> Categories { get; set; }
+        public List<Category> Categories { get; }
 
         [JsonProperty("genres")]
-        public List<Genre> Genres { get; set; }
+        public List<Genre> Genres { get; }
 
         [JsonProperty("screenshots")]
-        public List<Screenshot> Screenshots { get; set; }
+        public List<Screenshot> Screenshots { get; }
 
         [JsonProperty("movies")]
-        public List<Movie> Movies { get; set; }
+        public List<Movie> Movies { get; }
 
         [JsonProperty("recommendations")]
         public Recommendations Recommendations { get; set; }
@@ -110,11 +110,24 @@ namespace SteamStorefrontAPI.Classes
         public ControllerSupport? ControllerSupport { get; set; }
 
         [JsonProperty("dlc")]
-        public List<int> DLC { get; set; }
+        public List<int> DLC { get; }
 
         [JsonProperty("reviews")]
         public string Reviews { get; set; }
 
+        public SteamApp()
+        {
+            this.Developers = new List<string>();
+            this.Publishers = new List<string>();
+            this.Packages = new List<long>();
+            this.PackageGroups = new List<PackageGroup>();
+            this.Categories = new List<Category>();
+            this.Genres = new List<Genre>();
+            this.Screenshots = new List<Screenshot>();
+            this.Movies = new List<Movie>();
+            this.DLC = new List<int>();
+        }
+
         public static SteamApp FromJson(string json) {
 
             var serializerSettings = new JsonSerializerSettings

SteamStorefrontAPI/Classes/featured/FeaturedApps.cs

@@ -12,16 +12,16 @@ namespace SteamStorefrontAPI.Classes
     public class FeaturedApps
     {
         [JsonProperty("large_capsules")]
-        public List<AppInfo> LargeCapsules { get; set; }
+        public List<AppInfo> LargeCapsules { get; }
 
         [JsonProperty("featured_win")]
-        public List<AppInfo> FeaturedWin { get; set; }
+        public List<AppInfo> FeaturedWin { get; }
 
         [JsonProperty("featured_mac")]
-        public List<AppInfo> FeaturedMac { get; set; }
+        public List<AppInfo> FeaturedMac { get; }
 
         [JsonProperty("featured_linux")]
-        public List<AppInfo> FeaturedLinux { get; set; }
+        public List<AppInfo> FeaturedLinux { get; }
 
         [JsonProperty("layout")]
         public string Layout { get; set; }
@@ -29,6 +29,14 @@ namespace SteamStorefrontAPI.Classes
         //[JsonProperty("status")]
         //public int Status { get; set; }
 
+        public FeaturedApps()
+        {
+            this.LargeCapsules = new List<AppInfo>();
+            this.FeaturedWin = new List<AppInfo>();
+            this.FeaturedMac = new List<AppInfo>();
+            this.FeaturedLinux = new List<AppInfo>();
+        }
+
         public static FeaturedApps FromJson(string json)
         {
 

SteamStorefrontAPI/Classes/featuredcategories/FeaturedCategory.cs

@@ -18,7 +18,7 @@ namespace SteamStorefrontAPI.Classes
         public string Name { get; set; }
 
         [JsonProperty("items")]
-        public List<AppInfo> Items { get; set; }
+        public List<AppInfo> Items { get; }
 
         [JsonProperty("header_image")]
         public string HeaderImage { get; set; }
@@ -29,6 +29,11 @@ namespace SteamStorefrontAPI.Classes
         [JsonProperty("url")]
         public string Url { get; set; }
 
+        public FeaturedCategory()
+        {
+            this.Items = new List<AppInfo>();
+        }
+
         public static FeaturedCategory FromJson(string json)
         {
             var serializerSettings = new JsonSerializerSettings

SteamStorefrontAPI/Classes/packagedetails/PackageInfo.cs

@@ -24,7 +24,7 @@ namespace SteamStorefrontAPI.Classes
         public string SmallLogo { get; set; }
 
         [JsonProperty("apps")]
-        public List<PackageApp> Apps { get; set; }
+        public List<PackageApp> Apps { get; }
 
         [JsonProperty("price")]
         public PriceOverview Price { get; set; }
@@ -38,6 +38,12 @@ namespace SteamStorefrontAPI.Classes
         [JsonProperty("release_date")]
         public ReleaseDate ReleaseDate { get; set; }
 
+        public PackageInfo()
+        {
+            this.Apps = new List<PackageApp>();
+
+        }
+
         public static SteamApp FromJson(string json)
         {
 

SteamStorefrontAPI/Endpoints/FeaturedCategories.cs

@@ -18,7 +18,7 @@ namespace SteamStorefrontAPI
 
         /// <summary>
         /// Retrieves a list of featured items, grouped by category, via an asynchronous operation.</summary>  
-        public static async Task<List<FeaturedCategory>> GetAsync()
+        public static async Task<IEnumerable<FeaturedCategory>> GetAsync()
         {
             return await GetAsync(null, null);
         }
@@ -26,7 +26,7 @@ namespace SteamStorefrontAPI
         /// <summary>
         /// Retrieves a list of featured items, grouped by category, via an asynchronous operation.</summary>  
         /// <param name="CountryCode">Two letter country code to customise currency and date values.</param>
-        public static async Task<List<FeaturedCategory>> GetAsync(string CountryCode)
+        public static async Task<IEnumerable<FeaturedCategory>> GetAsync(string CountryCode)
         {
             return await GetAsync(CountryCode, null);
         }
@@ -35,7 +35,7 @@ namespace SteamStorefrontAPI
         /// Retrieves a list of featured items, grouped by category, via an asynchronous operation.</summary>  
         /// <param name="CountryCode">Two letter country code to customise currency and date values.</param>
         /// <param name="Language">Full name of the language in english used for string localization e.g. name, description.</param>
-        public static async Task<List<FeaturedCategory>> GetAsync(string CountryCode, string Language)
+        public static async Task<IEnumerable<FeaturedCategory>> GetAsync(string CountryCode, string Language)
         {
             string steamUri = steamBaseUri;
             steamUri = string.IsNullOrWhiteSpace(CountryCode) ? steamUri : $"{steamUri}?cc={CountryCode}";

SteamStorefrontConsole/Program.cs

@@ -43,10 +43,10 @@ namespace SteamStorefrontConsole
             FeaturedApps featured3 = await Featured.GetAsync("DE", "english");
 
             // Get a list of featured games grouped by category
-            List<FeaturedCategory> featuredCategories = await FeaturedCategories.GetAsync();
+            List<FeaturedCategory> featuredCategories = (await FeaturedCategories.GetAsync()).ToList();
 
             // Get a list of featured games grouped by category for region US
-            List<FeaturedCategory> featuredCategories2 = await FeaturedCategories.GetAsync("DE");
+            List<FeaturedCategory> featuredCategories2 = (await FeaturedCategories.GetAsync("DE")).ToList();
         }
     }
 }