{"id":499,"date":"2017-08-24T11:03:25","date_gmt":"2017-08-24T16:03:25","guid":{"rendered":"https:\/\/www.baronsoftware.com\/Blog\/?p=499"},"modified":"2017-08-24T11:03:25","modified_gmt":"2017-08-24T16:03:25","slug":"c-8-0-previewed-microsoft-visual-studio","status":"publish","type":"post","link":"https:\/\/www.baronsoftware.com\/Blog\/c-8-0-previewed-microsoft-visual-studio\/","title":{"rendered":"C# 8.0 Previewed"},"content":{"rendered":"

C# 8.0 Previewed<\/h1>\n

Originally written in\u00a0www.infoq.com,<\/a> some amazing stuff coming down the pipe for C#.<\/p>\n

Nullable Reference Types<\/b><\/h4>\n

We\u2019ve covered\u00a0nullable reference types<\/a>\u00a0in the past, but briefly the idea is that reference types would no longer be nullable by default. Instead, you have to explicitly mark them as nullable using the same \u201cType?\u201d syntax that you use for nullable value types.<\/p>\n

Assigning a null to a non-nullable reference type will be a compiler warning. Likewise, reading from a nullable type would be a compiler warning unless the variable in question was explicitly checked for null ahead of time. So theoretically the only change developers need to make is to sprinkle question marks where appropriate.<\/p>\n

Since our report, a new syntax was added to this feature. Consider a scenario where you know that the nullable variable x isn\u2019t actually null, but you can\u2019t prove that to the compiler. In this case you can use x!.Method() to suppress the compiler warning about potential null reference exceptions.<\/p>\n

Async Streams (a.k.a. foreach async)<\/b><\/h4>\n

Async streams are the asynchronous equivalent of IEnumerable. As we reported before,\u00a0async streams<\/a>\u00a0is something that they\u2019ve been working on since 2015. After much debate the syntax they settled on is:<\/p>\n

foreach<\/span> await<\/span> (<\/span>string<\/span> s in<\/span> asyncStream)<\/span><\/code><\/pre>\n
When defining an async iterator, you would use this function signature:<\/p>\n
async<\/span> IAsyncEnumerable<<\/span>T><\/span> MethodName<\/span>(<\/span>)<\/span><\/code><\/pre>\n
As with normal IEnumerable methods, you can use \u201cyield return\u201d to build the stream of objects in a lazy fashion.<\/p>\n
The benefit of using this instead of IObservable<T> from Reactive Extensions is that the consumer controls the flow rate. This is referred to as a \u201cpull model\u201d. By contrast, IObservable<T> is a \u201cpush model\u201d, which means the producer can flood the consumer with a higher flow rate than it can handle.<\/p>\n
Default Interface Implementations<\/b><\/h4>\n
Default interface implementations are essentially a limited form of multiple-inheritance. This will allow abstract interfaces to fully define methods just like abstract classes. However, abstract interfaces will still not be able to declare constructors or fields.<\/p>\n
Note: You can simulate fields on an interface using\u00a0ConditionalWeakTable<\/a>.<\/p>\n
The primary benefit of default interface implementations is that you may be able to add new methods to an existing interface without breaking backwards compatibility. This isn\u2019t guaranteed, as it would only work when a suitable default method can be devised.<\/p>\n
This is a very controversial feature. We won\u2019t repeat the arguments for and against it here, but you can read a summary of them in our earlier article on\u00a0default interface implementations<\/a>.<\/p>\n
Extension Everything<\/b><\/h4>\n
A long-time complaint about C# was that you could write extension methods, but not extension properties. In fact, there is no way to even define an extension property or event using the current pattern. Additionally, putting extension methods in static classes feels \u2018weird\u2019 to many people.<\/p>\n
Under the new design, there is a new top-level construct called an \u201cextension\u201d. For example, if you want to create extension methods and properties for a Customer class you would write:<\/p>\n
extension CustomerExt extends Customer<\/span> {<\/span>\r\n    \/\/methods and properties go here<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
As with interfaces, you cannot define instance fields in extensions but you can simulate them using ConditionalWeakTable. You can also define static fields.<\/p>\n
Extension Interfaces<\/b><\/h4>\n
Extension interfaces, the ability to add new interfaces to existing classes, is also being considered. This would not be a C# 8 feature though, as it would require changes to the underlying runtime.<\/p>\n","protected":false},"excerpt":{"rendered":"
C# 8.0 Previewed Originally written in\u00a0www.infoq.com, some amazing stuff coming down the pipe for C#. Nullable Reference Types We\u2019ve covered\u00a0nullable reference types\u00a0in the past, but briefly the idea is that reference types would no longer be nullable by default. Instead, you have to explicitly mark them as nullable using the same \u201cType?\u201d syntax that you […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[31,3],"tags":[33,16,100,21,20,7,13,22,47,40,8,29,15,6,24],"class_list":["post-499","post","type-post","status-publish","format-standard","hentry","category-software-development-concepts","category-software-events","tag-android","tag-apple","tag-c","tag-computers","tag-delphi","tag-development","tag-embarcadero","tag-google","tag-idera","tag-imac","tag-lazarus","tag-linux","tag-microsoft","tag-software","tag-windows-10"],"yoast_head":"\nC# 8.0 Previewed - Baron Software<\/title>\n<meta name=\"description\" content=\"Originally written in infoq.com, some amazing stuff coming down the pipe for C#. This could be part of Visual Studio in the future.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.baronsoftware.com\/Blog\/c-8-0-previewed-microsoft-visual-studio\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C# 8.0 Previewed\" \/>\n<meta property=\"og:description\" content=\"Originally written in\u00a0www.infoq.com, some amazing stuff coming down the pipe for C#.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.baronsoftware.com\/Blog\/c-8-0-previewed-microsoft-visual-studio\/\" \/>\n<meta property=\"og:site_name\" content=\"Baron Software\" \/>\n<meta property=\"article:published_time\" content=\"2017-08-24T16:03:25+00:00\" \/>\n<meta name=\"author\" content=\"richard@baronsoftware.com\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"C# 8.0 Previewed\" \/>\n<meta name=\"twitter:description\" content=\"Originally written in\u00a0www.infoq.com, some amazing stuff coming down the pipe for C#.\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.baronsoftware.com\/Blog\/wp-content\/uploads\/2014\/12\/logo.jpg\" \/>\n<meta name=\"twitter:creator\" content=\"@Rbaroniunas\" \/>\n<meta name=\"twitter:site\" content=\"@Rbaroniunas\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"richard@baronsoftware.com\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.baronsoftware.com\\\/Blog\\\/c-8-0-previewed-microsoft-visual-studio\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.baronsoftware.com\\\/Blog\\\/c-8-0-previewed-microsoft-visual-studio\\\/\"},\"author\":{\"name\":\"richard@baronsoftware.com\",\"@id\":\"https:\\\/\\\/www.baronsoftware.com\\\/Blog\\\/#\\\/schema\\\/person\\\/079d370e4230be9d5f75885bb33dd8cd\"},\"headline\":\"C# 8.0 Previewed\",\"datePublished\":\"2017-08-24T16:03:25+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.baronsoftware.com\\\/Blog\\\/c-8-0-previewed-microsoft-visual-studio\\\/\"},\"wordCount\":560,\"publisher\":{\"@id\":\"https:\\\/\\\/www.baronsoftware.com\\\/Blog\\\/#organization\"},\"keywords\":[\"Android\",\"Apple\",\"C#\",\"computers\",\"Delphi\",\"Development\",\"Embarcadero\",\"Google\",\"Idera\",\"iMac\",\"Lazarus\",\"Linux\",\"Microsoft\",\"Software\",\"Windows 10\"],\"articleSection\":[\"Software development Concepts\",\"Software Events\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.baronsoftware.com\\\/Blog\\\/c-8-0-previewed-microsoft-visual-studio\\\/\",\"url\":\"https:\\\/\\\/www.baronsoftware.com\\\/Blog\\\/c-8-0-previewed-microsoft-visual-studio\\\/\",\"name\":\"C# 8.0 Previewed - Baron Software\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.baronsoftware.com\\\/Blog\\\/#website\"},\"datePublished\":\"2017-08-24T16:03:25+00:00\",\"description\":\"Originally written in infoq.com, some amazing stuff coming down the pipe for C#. 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