ASP.NET Core Blazor: moderne Businessanwendungen mit C# & WebAssembly – Full-Stack & Cross-Plattform

Das Web als Plattform und der Browser als Ausführungsumgebung haben vor vielen Jahren ihren Siegeszug als Basis für moderne Businessanwendungen angetreten. Mit dem WebAssembly-Standard kann ein Entwickler heute neben JavaScript und TypeScript auch andere nicht webnative Programmiersprachen und Frameworks nutzen, um Cross-Plattform-Lösungen für den Browser zu realisieren. In diesem Workshop widmet sich Christian Weyer dem clientseitigen Blazor WebAssembly Framework des ASP.NET-Core-Teams. Sehen Sie, wie man mit Blazor, C# und .NET Web-basierte Single Page Applications (SPAs) baut und wie man mit einer passenden Anwendungsarchitektur über API und Push Services eine Full-Stack-Lösung mit C# implementiert. Auch weiterführende Konzepte wie Interoperabilität mit der Browserplattform und Umsetzung von Progressive Web Apps (PWAs) werden thematisiert. Zur Abrundung des Workshops soll auch ein Blick auf Server-side Blazor und der Vergleich damit nicht fehlen, um einschätzen zu können, wann man was einsetzt – und wann nicht.

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1. Workshop ASP.NET Core Blazor: Moderne Businessanwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Christian Weyer https://thinktecture.com/christian-weyer @christianweyer CTO, Co-Founder - Thinktecture AG
2. 2 § Co-Founder & CTO at Thinktecture AG § Personal focus on § Mobile & web-based application architectures § Interoperability, cross-device § Pragmatic end-to-end solutions § Cloud-native & serverless architectures § Independent Microsoft Regional Director § Microsoft MVP for Developer Technologies & Azure § ASPInsider, AzureInsider § Google GDE for Web Technologies, Angular christian.weyer@thinktecture.com @christianweyer https://www.thinktecture.com Christian Weyer Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
3. 3 § No longer Windows-only § Web-enabled § Deployment § Updates § Native-like features § Still: Smart Client § Path to Software-as-a-Service (SaaS) § APIs are king § Possibilities for specialized Microservices § SaaS is the big transformation ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Modern Business Applications
4. 4 § Users want: § Cross-Platform, Cross-Device § No installations § Offline (important for may use cases) § Developers think: § Web is the solution, but web is different § SPA is the solution, but SPA is different § JavaScript seems to be an issue for some .NET developers § There is existing .NET code, what to do about it? § Which technologies to choose? § JavaScript, everywhere? C# & .NET everywhere? § In the Frontend: Can Blazor help here? ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform OK - what is the problem?
5. 5 § Automatic-Windows-to-Web-conversion-wonder-machine ™ § Next incarnation of Silverlight (as Blazor is Web-all-the-way) § JavaScript killer ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform What is Blazor NOT? X
6. 6 § Blazor is a family of web technologies § Server § WebAssembly § Blazor WebAssembly is a SPA framework § Web, SPA & distributed computing knowledge § HTML, CSS knowledge § DOM knowledge § JavaScript for DOM interaction & 3rd party integration § C# & .NET Standard for client-side logic → Full-stack C# possible ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform What is Blazor? Mono Runtime .NET CLR .NET Core / .NET Standard 2.1 .NET Framework Blazor WebAssembly Blazor Server Razor Components Browser (WASM / .NET / JS) Browser (JS Stub) Server (.NET)
7. 7 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Our Journey Today Architecture + The Web as a Platform Blazor Idea & Approach Components all over SPAs with .NET with .NET Backends Interop & Integration Comparison Data Binding & Forms Current State & Future
8. Architecture Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
9. Architecture Online Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
10. 10 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Bird’s-Eye-View: Typical Target Architectures HTTP API WS API Service D HTTPS HTTPS WebSocket Service A Service B Service C HTTP API
11. Architecture Offline Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
12. Demo A typical Business Application Online-only Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
13. 13 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Our Blazor Journey The Web as a Platform Blazor Idea & Approach Components all over SPAs with .NET Interop & Integration Comparison Data Binding & Forms Current State & Future PWA Web Components Web Assembly
14. ”The web has won.” Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
15. 15 § Web applications should… § Feel & behave more like a native app § Be installable, without (classic) app stores § Be able to work completely offline, without any server connections § Receive push notifications, without running § PWAs are targeted at both, mobile and desktop § Progressive Web Apps are not a technology § Collection of characteristics an application must/should support ➔ “Uber Pattern” § Various technologies are available to progressively enhance an application § Some outstanding standards like Web App Manifest, Service Workers § Web Capabilities wants to close gap between native and web ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Progressive Web Apps (PWA) – the Web gets more native
16. 16 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform
17. ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Offline Capability with Service Worker Mobile or Desktop system Remote storage Server HTTPS Browser sandbox Web App HTML/JS Cache storage fetch Service Worker
18. ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Web Components § Reuse existing functionality as components § Safe your investments § Bring semantics into UI § Web Components are not a standard, but a collection of technologies § Custom Elements § HTML templates § Shadow DOM § Web Components bring a native component model to the web instead of having to use frameworks
19. 19 § Low-level bytecode for the Web – beyond asm.js § Bring any language into the browser § Currently targeted at C/C++ § Achieve superior performance in certain cases § Because JavaScript (but not a replacement for JavaScript!) § Stack machine-based § Not AST, or register- or SSA-based bytecode § See https://github.com/WebAssembly/design/blob/master/Rationale.md § Goals § Fast, efficient, portable ▪ Use existing sandboxing tools § Readable and debuggable ▪ Don’t break the Web ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform WebAssembly (WASM) https://twitter.com/getify/status/997098808344547328
20. 20 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform https://caniuse.com/#feat=wasm
21. 21 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Our Blazor Journey The Web as a Platform Blazor Idea & Approach Components all over SPAs with .NET Interop & Integration Comparison Data Binding & Forms Current State & Future Web Assembly .NET Razor Components
22. 22 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Blazor WebAssembly in the Browser Blazor DOM Web Assembly .NET Razor Components
23. 23 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Blazor WebAssembly Technical Architecture Compiler Parser JIT (.NET Assemblies are interpreted) Web APIs (DOM, IndexedDb, File Storage etc.) Browser blazor. webassembly.js Blazor SPA page (.html) JS Runtime dotnet.wasm dotnet.js mscorlib.dll etc. myapp.dll * As of 20.09.2020 blazor.boot.json
24. 24 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Our Blazor Journey The Web as a Platform Blazor Idea & Approach Components all over SPAs with .NET Interop & Integration Comparison Data Binding & Forms Current State & Future Razor → Blazor HTML, CSS C# Pages vs. Components
25. Pages Fundamentals Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
26. RenderTree Generated C# Code Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
27. Routing Fundamentals Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
28. Components Fundamentals Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
29. 29 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Our Blazor Journey The Web as a Platform Blazor Idea & Approach Components all over SPAs with .NET Interop & Integration Comparison Data Binding & Forms Current State & Future Class Libraries Full Stack DI .NET-isms
30. Dependency Injection Components & Services Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
31. Code-Behind Clean code Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
32. Web APIs Fundamentals Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
33. Web APIs Entity Framework Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
34. Web APIs DTOs Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
35. Web APIs Validation Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
36. Web APIs HttpClient Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
37. SignalR Fundamentals Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
38. SignalR Clients Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
39. Authentication OIDC Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
40. gRPC Fundamentals Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
41. gRPC Clients Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
42. 42 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Our Blazor Journey The Web as a Platform Blazor Idea & Approach Components all over SPAs with .NET Interop & Integration Comparison Data Binding & Forms Current State & Future Data Binding Forms Validation
43. Data Binding One-way and Two-way Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
44. Forms Fundamentals Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
45. Validation DataAnnotations Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
46. Validation FluentValidation Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
47. 3rd Party Components Native vs. JavaScript Wrapper Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
48. 48 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Our Blazor Journey The Web as a Platform Blazor Idea & Approach Components all over SPAs with .NET Interop & Integration Comparison Data Binding & Forms Current State & Future 3rd Party JS Interop PWA Web Components
49. JavaScript Interop .NET-to-JS Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
50. SPA Integration Web Components Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
51. JavaScript Interop JS-to-.NET Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
52. Electron Cross-Platform Desktop Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
53. Capacitor Cross-Platform Mobile Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
54. Progressive Web Apps (PWA) The new Cross-Platform Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
55. UI Frameworks Commercial and Open Source Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
56. 56 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Our Blazor Journey The Web as a Platform Blazor Idea & Approach Components all over SPAs with .NET Interop & Integration Comparison Data Binding & Forms Current State & Future Blazor Server Established SPA Frameworks Cross-Platform
57. 57 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Blazor Server Blazor JS Stub DOM .NET Razor Components ASP.NET Core (Server) SignalR-based binary data exchange State, Connections etc. Browser (Client) UI Diffs Events
58. 58 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Blazor Server – Disconnected UX
59. ✅ Full SPA architecture approach ✅ No latency, code runs locally in the browser ✅ Full support for offline scenarios ✅ Deployment: static files on web server or cloud storage; Desktop or mobile app packaging ✴ Initial download size may be large (assets cached in browser, via Service Worker) ❌ .NET Standard code is currently interpreted by special WASM-version of Mono runtime ❌ Always needs JavaScript/TypeScript, until WASM standard is being further evolved ✅ Thin Client approach for light devices ✅ Full .NET runtime on the server, not just .NET Standard ✅ No need for API-based architecture ✴ All your code is on the server ❌ Inherently stateful execution model ❌ Need for permanent physical connections ❌ No viable option to implement offline features ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform My Personal Comparison Blazor WebAssembly Blazor Server
60. 60 Blazor WebAssembly Angular Language C# JavaScript, TypeScript Pre-Requisites No further pre-requisites Promotes usage of RxJS Tooling Visual Studio 2019, VS Code, VS for Mac, Rider WebStorm, VS Code et. al. Packaging Your assemblies/DLLs in the browser Optimized JS via webpack Maturity Brand new, even Preview; no predecessor Very mature; lots of experience from previous versions Community Just starts to build up Very large Ecosystem OSS will build up; Various commercial vendors expected Lots of OSS; Also commercial vendors Integration 3rd party For every JS/TS library we need a proxy/shim npm universe: pick and choose; easy to integrate Dependencies WASM support in browsers - Full Stack with single tech C#, .NET Standard JS/TS (e.g. nest.js) Size Not really optimized yet; quite large Continuously improved over years Runtime performance No experience, no real numbers; .NET is interpreted; interop WASM and JS worlds Continuously improved over years; may have pitfalls ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform My Personal View Blazor ⇔ Angular
61. Azure Deployment From Blob Storage to Full-blown Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform ASP.NET Core Blazor
62. 62 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Our Blazor Journey The Web as a Platform Blazor Idea & Approach Components all over SPAs with .NET Interop & Integration Comparison Data Binding & Forms Current State & Future Limits Missing Features Roadmap
63. 63 § Blazor WebAssembly is in v1 as 3.2.0 § WASM is an MVP (and SPAs are not a target of it) § Mono WASM runtime is immature § Blazor is under ongoing development § Missing Features, e.g. § Modules, Lazy Loading § Component Model with CSS Encapsulation § AOT Builds § Better Developer Tooling (e.g. improved Debugger, Live Reload) § Roadmap § Improved & enhanced Blazor WASM in .NET 5 timeframe -> November 2020 § AOT postponed to .NET 6 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Current State & Future
64. 64 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Blazor Recap Blazor WebAssembly enables SPAs based on C# and .NET Standard. You need to know Web, SPA architectures, Security et. al. – and JavaScript! Blazor is young & immature – technical architecture, app size, missing features. The ecosystem is immature – may evolve similar to JS SPA frameworks, plus commercial vendors. The modern web with PWA & Web Components can also work and live with Blazor WebAssembly. Blazor Server might be a fit for internal applications. Stateful server-side execution model.
65. 65 § Microsoft is building a new UI framework for the browser – so… § ❓… ask yourself § “How do we deal with Blazor WebAssembly?” § “Why would we pick Blazor WebAssembly over an established SPA framework?” § “Why would we choose a SPA framework, and not Blazor WebAssembly?” § ❗… you need to check your § Plans for existing & new projects § Team skills § Architecture § Codebase § Try it out & build Proof-of-Concepts (with experienced people) § Web Assembly & Blazor might change the game – but it may not be a game changer for you ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Call-to-Action
66. 66 ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Blazor WebAssembly Whitepaper (deutsch) https://www.thinktecture.com/de/whitepapers/blazor-webassembly
67. Danke! Bei Fragen kontaktieren Sie mich gerne Christian Weyer https://thinktecture.com/christian-weyer @christianweyer christian.weyer@thinktecture.com Demoanwendung: https://github.com/thinktecture/blazor-webassembly-demo https://github.com/thinktecture/basta-2020-blazor Artikel zu Blazor, PWA, Web Components, Angular, .NET Core & mehr: https://thinktecture.com/de/newsletter
68. 68 § Running Your ASP.NET Core Blazor WebAssembly Application As A Progressive Web App (PWA) § https://www.thinktecture.com/de/blazor/progressive-web-apps-pwa/ § Re-Using Angular Components In A Blazor WebAssembly Application Using Angular Elements - Web Components Custom Elements, FTW! § https://www.thinktecture.com/de/blazor/integration-angular-elements-web-components/ § Blazor § https://dotnet.microsoft.com/apps/aspnet/web-apps/blazor § Cordova § https://cordova.apache.org/ § Capacitor § https://capacitor.ionicframework.com/ § Electron § https://www.electronjs.org/ § WebWindow § https://blog.stevensanderson.com/2019/11/18/2019-11-18-webwindow-a-cross-platform-webview-for-dotnet-core/ ASP.NET Core Blazor Moderne Business-Anwendungen mit C# & WebAssembly – Full-Stack- und Cross-Plattform Resources