hardcoded search error messages changed to string resources

VDownload.Sources/VDownload.Sources.Common/MediaSearchException.cs

@@ -8,13 +8,21 @@ namespace VDownload.Sources.Common
 {
     public class MediaSearchException : Exception
     {
+        #region PROPERTIES
+
+        public string StringCode { get; protected set; }
+
+        #endregion
+
+
+
         #region CONSTRUCTORS
 
-        public MediaSearchException() : base() { }
-
-        public MediaSearchException(string message) : base(message) { }
-
-        public MediaSearchException(string message, Exception inner) : base(message, inner) { }
+        public MediaSearchException(string stringCode) : this(stringCode, stringCode) { }
+        public MediaSearchException(string stringCode, string message) : base(message)
+        {
+            StringCode = stringCode;
+        }
 
         #endregion
     }

VDownload.Sources/VDownload.Sources.Common/SourceSearchService.cs

@@ -32,7 +32,7 @@ namespace VDownload.Sources.Common
                     return video;
                 }
             }
-            throw new MediaSearchException("Invalid url"); // TODO : Change to string resource
+            throw CreateExceptionUnknownMediaType();
         }
 
         public async Task<Playlist> SearchPlaylist(string url, int maxVideoCount)
@@ -47,7 +47,7 @@ namespace VDownload.Sources.Common
                     return video;
                 }
             }
-            throw new MediaSearchException("Invalid url"); // TODO : Change to string resource
+            throw CreateExceptionUnknownMediaType();
         }
 
         #endregion
@@ -60,6 +60,9 @@ namespace VDownload.Sources.Common
 
         protected abstract IEnumerable<SearchRegexPlaylist> GetPlaylistRegexes();
 
+        protected MediaSearchException CreateExceptionUnknownMediaType() => new MediaSearchException("UnknownMediaType");
+        protected MediaSearchException CreateExceptionEmptyPlaylist() => new MediaSearchException("EmptyPlaylist");
+
         #endregion
     }
 }