Remove illegal characters from the video title

Author: flagbug

YoutubeExtractor/ExampleApplication/ExampleApplication.csproj

@@ -47,6 +47,7 @@
     <CodeAnalysisIgnoreBuiltInRules>false</CodeAnalysisIgnoreBuiltInRules>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="System" />
     <Reference Include="System.Core" />
   </ItemGroup>
   <ItemGroup>

YoutubeExtractor/ExampleApplication/Program.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Text.RegularExpressions;
 using YoutubeExtractor;
 
 namespace ExampleApplication
@@ -25,7 +26,8 @@ private static void DownloadAudio(IEnumerable<VideoInfo> videoInfos)
              */
 
             var audioDownloader = new AudioDownloader(video,
-                Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), video.Title + video.AudioExtension));
+                Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments),
+                RemoveIllegalPathCharacters(video.Title) + video.AudioExtension));
 
             // Register the progress events. We treat the download progress as 85% of the progress
             // and the extraction progress only as 15% of the progress, because the download will
@@ -54,7 +56,8 @@ private static void DownloadVideo(IEnumerable<VideoInfo> videoInfos)
              * The second argument is the path to save the video file.
              */
             var videoDownloader = new VideoDownloader(video,
-                Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), video.Title + video.VideoExtension));
+                Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments),
+                RemoveIllegalPathCharacters(video.Title) + video.VideoExtension));
 
             // Register the ProgressChanged event and print the current progress
             videoDownloader.DownloadProgressChanged += (sender, args) => Console.WriteLine(args.ProgressPercentage);
@@ -80,5 +83,12 @@ private static void Main()
             //DownloadAudio(videoInfos);
             DownloadVideo(videoInfos);
         }
+
+        private static string RemoveIllegalPathCharacters(string path)
+        {
+            string regexSearch = new string(Path.GetInvalidFileNameChars()) + new string(Path.GetInvalidPathChars());
+            var r = new Regex(string.Format("[{0}]", Regex.Escape(regexSearch)));
+            return r.Replace(path, "");
+        }
     }
 }