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![](\"https:\/\/jirak.net\/wp\/wp-content\/uploads\/2018\/06\/94a598fc5167d0f5f199578d8a5436e7.png\")
<\/p>\nC# Console UWP Applications
\n<\/p>\n
We\u2019ve just published an update to the Console UWP App project templates on the Visual Studio marketplace\u00a0here<\/a>.<\/strong> The latest version (v1.5) adds support for C#. The C# template code only works with Visual Studio 2017 version 15.7 or later.\u00a0In\u00a0a previous post<\/a>,\u00a0I\u00a0described how to build a simple\u00a0findstr\u00a0UWP app using the C++ Console templates. In this post, we\u2019ll look at how to achieve the same with C#, and call out a few additional wrinkles you should be aware of.<\/p>\n Having installed the updated VSIX, you can now choose a C# Console\u00a0UWP\u00a0App from the New Project dialog:<\/p>\n N<\/span><\/span>ote that C# console apps are only supported from version 10.0.17134.0 of the platform. You should therefore specify a version >= 10.0.17134 for the\u00a0<\/span><\/span>minimum platform version\u00a0<\/span><\/span>when you create your project.<\/span><\/span>\u00a0If you forget this step, you can\u00a0<\/span><\/span>fix it<\/span><\/span>\u00a0at any time later by manually editing your .<\/span><\/span>csproj<\/span><\/span>\u00a0and updating the\u00a0<\/span><\/span>TargetPlatformMinVersion<\/span><\/span>\u00a0value.<\/span><\/span>\u00a0<\/span><\/p>\n Also note that with the C# template, you might get the error message “Output type ‘Console Application’ is not supported by one or more of the project’s targets.<\/i>” You can\u00a0safely\u00a0ignore this message\u00a0\u2013 even though it is flagged as an error, it doesn\u2019t actually make any difference to anything and\u00a0doesn\u2019t prevent the project from building correctly.<\/p>\n As with the C++ template, the generated code includes a Main method. One difference you\u2019ll notice with the C# version is that the command-line arguments are passed directly into Main.\u00a0Recall that in the C++ version, you don\u2019t get the arguments into main, but instead\u00a0you\u00a0need to use the global __argc\u00a0and __argv\u00a0variables.\u00a0Notice that you can also now use the\u00a0System.Console\u00a0APIs just as you would in a non-UWP console app.<\/p>\n As\u00a0<\/span><\/span>before,\u00a0<\/span><\/span>for the file-handling behavior needed for the\u00a0<\/span><\/span>findstr<\/span><\/span>\u00a0app, you<\/span><\/span>\u00a0need to add the\u00a0<\/span><\/span>broadFileSystemAccess<\/span><\/span>\u00a0restricted capability. Adding this will cause your app to get some extra scrutiny when you submit it to the Store<\/span><\/span>. Y<\/span><\/span>ou will need to describe how you int<\/span><\/span>end to use the feature, and show that your usage is reasonable and legitimate.<\/span><\/span>\u00a0<\/span><\/p>\n Because the app will\u00a0be doing some simple file handling and pattern matching, in the C++ version,\u00a0I\u00a0had to #include the\u00a0Windows.Storage.h\u00a0and regex, and declare the corresponding namespaces. In C#,\u00a0you\u00a0need the\u00a0equivalent\u00a0Windows.Storage\u00a0and\u00a0System.Text.RegularExpressions\u00a0namespaces.<\/p>\n For the\u00a0findstr\u00a0functionality, recall that I\u2019m expecting a command-line such as \u201cCsFindstr\u00a0foo C:Bar\u201d, where \u201cfoo\u201d is the pattern to search for, and \u201cC:Bar\u201d is the folder location from which to start the recursive search. I can strip out all the generated code in Main, and replace it with firstly a simple test for the\u00a0expected number of\u00a0command-line arguments, and secondly a call to a\u00a0RecurseFolders\u00a0method (which I\u2019ll write in a minute).\u00a0In the C++ version, I tested __argc\u00a0< 3, but in the managed version I need to test the incoming\u00a0args.Length\u00a0for < 2 (the executable module name itself is not included in the C#\u00a0args).<\/p>\n Now for the custom\u00a0RecurseFolders\u00a0method. Inside this method, I need to use a number of\u00a0async\u00a0methods for the file handling, so the method needs to be declared\u00a0async\u00a0\u2013 and this is also why I called Wait() on the Task return from the method back up in Main.\u00a0I can\u2019t make Main\u00a0async, so I must make sure to contain all\u00a0meaningful\u00a0async\u00a0return values\u00a0within the lower-level methods.<\/p>\n In this method, I\u2019ll get the\u00a0StorageFolder\u00a0for the root folder supplied by the user on the command-line, get the files in this folder, and\u00a0then continue down the folder tree for all\u00a0sub-folders\u00a0and their files:<\/p>\n The\u00a0<\/span>GetDirectories<\/span>\u00a0method is the\u00a0<\/span><\/span>actual\u00a0<\/span><\/span>recursive method that performs the same operation (get the files in the current folder, then\u00a0<\/span>recurse<\/span>\u00a0sub-folders):<\/span><\/span>\u00a0<\/span><\/p>\n Finally, the\u00a0<\/span>SearchFile<\/span>\u00a0method, which is where I\u2019m doing the pattern-matching, using Regex<\/span><\/span>. As before, I\u2019m enhancing the raw search pattern to search for any whitespace-delimited \u201cword\u201d that contains the user-supplied pattern.<\/span><\/span>\u00a0Then I walk the returned\u00a0<\/span>MatchCollection<\/span>, and print out all the found \u201cwords\u201d and their position in the file.<\/span><\/span>\u00a0<\/span><\/p>\n With this, I can now p<\/span><\/span>ress F5 to build and deploy the app. For console apps it often makes sense to set the Debug properties to \u201cDo not launch, but debug my code when it starts\u201d \u2013 because the most useful testing will be done with varying command-line arguments, and therefore by launching the app from a command prompt<\/span><\/span>\u00a0rather from Visual Studio.<\/span><\/span>\u00a0<\/span><\/p>\n I can t<\/span><\/span>est the app using a command window or\u00a0<\/span>powershell<\/span>\u00a0window:<\/span><\/span>\u00a0<\/span><\/p>\n That\u2019s it! You can now write Console UWP apps in C#.<\/span><\/span>\u00a0Full source code for this sample app is on\u00a0<\/span>Github<\/span>\u00a0<\/span><\/span>here<\/span><\/span><\/a>.<\/span><\/span><\/strong>\u00a0<\/span><\/p>\n Source: C# Console UWP Applications<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" C# Console UWP Applications We\u2019ve just published an update to the Console UWP App project templates on the Visual Studio marketplace\u00a0here. The latest version (v1.5) adds support for C#. The C# template code only works with Visual Studio 2017 version 15.7 or later.\u00a0In\u00a0a previous post,\u00a0I\u00a0described how to build a simple\u00a0findstr\u00a0UWP app using the C++ Console templates. In this post, we\u2019ll look at how to achieve the same with C#, and call out a few additional wrinkles you should be aware of. Having installed the updated VSIX, you can now choose a C# Console\u00a0UWP\u00a0App from the New Project dialog: Note that C# console apps are only supported from version 10.0.17134.0 of the platform. You should therefore specify a version >= 10.0.17134 for the\u00a0minimum platform version\u00a0when you create your project.\u00a0If you forget this step, you can\u00a0fix it\u00a0at any time later by manually [ more… ]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":24816,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[169],"tags":[201],"class_list":["post-24815","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","tag-windows"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/posts\/24815","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/comments?post=24815"}],"version-history":[{"count":1,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/posts\/24815\/revisions"}],"predecessor-version":[{"id":24817,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/posts\/24815\/revisions\/24817"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/media\/24816"}],"wp:attachment":[{"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/media?parent=24815"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/categories?post=24815"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jirak.net\/wp\/wp-json\/wp\/v2\/tags?post=24815"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"choose](\"https:\/\/blogs.windows.com\/uploads\/mswbprod\/sites\/3\/2018\/06\/94a598fc5167d0f5f199578d8a5436e7.png\")
<\/a><\/p>\n![\"If](\"https:\/\/blogs.windows.com\/uploads\/mswbprod\/sites\/3\/2018\/06\/72e149197dac2673ae9225282ed726a3.png\")
<\/a><\/p>\n\r\n\r\nstatic void Main(string[] args) \r\n{ \r\n if (args.Length == 0) \r\n { \r\n Console.WriteLine("Hello - no args"); \r\n } \r\n else \r\n { \r\n for (int i = 0; i < args.Length; i++) \r\n { \r\n Console.WriteLine($"arg[{i}] = {args[i]}"); \r\n } \r\n } \r\n Console.WriteLine("Press a key to continue: "); \r\n Console.ReadLine(); \r\n} \r\n\r\n<\/pre>\n\r\n\r\nxmlns:rescap="http:\/\/schemas.microsoft.com\/appx\/manifest\/foundation\/windows10\/restrictedcapabilities" \r\n IgnorableNamespaces="uap mp uap5 desktop4 iot2 rescap"> \r\n\u2026 \r\n <Capabilities> \r\n <Capability Name="internetClient" \/> \r\n <rescap:Capability Name="broadFileSystemAccess" \/> \r\n <\/Capabilities> \r\n\r\n<\/pre>\n
\r\n\r\nstatic void Main(string[] args) \r\n{ \r\n if (args.Length < 2) \r\n { \r\n Console.WriteLine("Insufficient arguments."); \r\n Console.WriteLine("Usage:"); \r\n Console.WriteLine(" mFindstr <search-pattern> <fully-qualified-folder-path>."); \r\n Console.WriteLine("Example:"); \r\n Console.WriteLine(" mFindstr on D:Temp."); \r\n } \r\n else \r\n { \r\n string searchPattern = args[0]; \r\n string folderPath = args[1]; \r\n RecurseFolders(folderPath, searchPattern).Wait(); \r\n } \r\n \r\n Console.WriteLine("Press a key to continue: "); \r\n Console.ReadLine(); \r\n} \r\n\r\n<\/pre>\n\r\n\r\nprivate static async Task<bool> RecurseFolders(string folderPath, string searchPattern) \r\n{ \r\n bool success = true; \r\n try \r\n { \r\n StorageFolder folder = await StorageFolder.GetFolderFromPathAsync(folderPath); \r\n \r\n if (folder != null) \r\n { \r\n Console.WriteLine( \r\n $"Searching folder '{folder}' and below for pattern '{searchPattern}'"); \r\n try \r\n { \r\n \/\/ Get the files in this folder. \r\n IReadOnlyList<StorageFile> files = await folder.GetFilesAsync(); \r\n foreach (StorageFile file in files) \r\n { \r\n SearchFile(file, searchPattern); \r\n } \r\n \r\n \/\/ Recurse sub-directories. \r\n IReadOnlyList<StorageFolder> subDirs = await folder.GetFoldersAsync(); \r\n if (subDirs.Count != 0) \r\n { \r\n GetDirectories(subDirs, searchPattern); \r\n } \r\n } \r\n catch (Exception ex) \r\n { \r\n success = false; \r\n Console.WriteLine(ex.Message); \r\n } \r\n } \r\n } \r\n catch (Exception ex) \r\n { \r\n success = false; \r\n Console.WriteLine(ex.Message); \r\n } \r\n return success; \r\n} \r\n\r\n<\/pre>\n\r\n\r\nprivate static async void GetDirectories(IReadOnlyList<StorageFolder> folders, string searchPattern) \r\n{ \r\n try \r\n { \r\n foreach (StorageFolder folder in folders) \r\n { \r\n \/\/ Get the files in this folder. \r\n IReadOnlyList<StorageFile> files = await folder.GetFilesAsync(); \r\n foreach (StorageFile file in files) \r\n { \r\n SearchFile(file, searchPattern); \r\n } \r\n \r\n \/\/ Recurse this folder to get sub-folder info. \r\n IReadOnlyList<StorageFolder> subDirs = await folder.GetFoldersAsync(); \r\n if (subDirs.Count != 0) \r\n { \r\n GetDirectories(subDirs, searchPattern); \r\n } \r\n } \r\n } \r\n catch (Exception ex) \r\n { \r\n Console.WriteLine(ex.Message); \r\n } \r\n} \r\n\r\n<\/pre>\n\r\n\r\nprivate static async void SearchFile(StorageFile file, string searchPattern) \r\n{ \r\n if (file != null) \r\n { \r\n try \r\n { \r\n Console.WriteLine($"Scanning file '{file.Path}'"); \r\n string text = await FileIO.ReadTextAsync(file); \r\n string compositePattern = \r\n "(S+s+){0}S*" + searchPattern + "S*(s+S+){0}"; \r\n Regex regex = new Regex(compositePattern); \r\n MatchCollection matches = regex.Matches(text); \r\n foreach (Match match in matches) \r\n { \r\n Console.WriteLine($"{match.Index,8} {match.Value}"); \r\n } \r\n } \r\n catch (Exception ex) \r\n { \r\n Console.WriteLine(ex.Message); \r\n } \r\n } \r\n} \r\n\r\n<\/pre>\n![\"For](\"https:\/\/blogs.windows.com\/uploads\/mswbprod\/sites\/3\/2018\/06\/6ee7bdbd0dbdab5bfe36a968779af296.png\")
<\/a><\/p>\n![\"Test](\"https:\/\/blogs.windows.com\/uploads\/mswbprod\/sites\/3\/2018\/06\/0e521223d3f95d1e8ebf3aab383cbe2c.png\")
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