Asynchronous Programming in C# - Part 1
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The document discusses asynchronous programming in C#, covering its definition, various programming models (APM, EAP, Task), and error handling techniques. It outlines the benefits of asynchronous capabilities in improving performance and provides resources for further learning. The presenter, Vikash Kumar from Mindfire Solutions, shares his expertise and contact information for audience engagement.
Asynchronous Programming in C# - Part 1
- 1. Asynchronous Programming in C# - Part 1 Presenter: Vikash Kumar, Mindfire Solutions (28/07/2014)
- 2. About Me MCTS-70-515 - Microsoft .NET 4.0, Web App Development MCP:70-483: MS - Programming in C# Skills: MVC, Asp.Net WebForms, C#, EntityFramework, OpenAccess, TypeScript, SEO, jQuery, KendoUI, Lucene.Net, Asynchronous programming, Sql Server. Connect Me: Blog :- http://vikutech.blogspot.in/ Twitter :- https://twitter.com/viku85 LinkedIn :- http://www.linkedin.com/pub/vikash-kumar/11/4b5/625 Google+ :- https://plus.google.com/108754146104237310375 Contact Me: Email :- [email protected] / [email protected] Skype :- mfsi_vikash
- 3. Agenda What is asynchronous? Asynchronous programming options and history Thread and ThreadPool Asynchronous Programming Model (APM) Event-based Asynchronous Pattern (EAP) Task – Basics – Exception handling – Relationships
- 4. What is asynchronous? Image Source: http://www.webopedia.com/ To do more than one thing at a time. asyn = not with chronos = time
- 5. Asynchronous programming options and history Thread Asynchronous Programming Model (APM) Event-Based Asynchronous Pattern (EAP) BackgroundWorker Task Task Parallel Library - DataFlow Task Parallel Library – Parallel APIs Thread → APM → EAP → TAP
- 6. Thread and ThreadPool Basic building block for async programming. Parameterize thread, came with .NET 2.0 Image source:http://johnpaulmorabito.blogspot.in/
- 7. APM and EAP APM depends upon Begin and End methods. Callbacks are dependent on IAsyncResult. EAP came with .NET 2.0 which automatically handles synchronization context. BackgroundWorker is an example of EAP based programming. EAP can be seen while adding web reference which automatically creates with proxies classes.
- 8. APM and EAP
- 9. Task A task is an abstraction of unit of work to run asynchronously. Ways to execute: new Task(Speak).Start(), Task.Factory.StartNew(Speak), Task.Run(Speak) Use FromAsync when an API has BeginXXX/EndXXX. Task can be canceled through CancellationToken and checked with ThrowIfCancellationRequested. IProgress<T> came with 4.5 which can be used to show status
- 10. Task error handling Task are completed with following state: Ran to Completion, Canceled and Faulted. Task uses AggregateException to wrap up any other exception occurs which can be found under inner exception. AggregateException comes with Flatten method to check all exceptions. AggregateException also comes with Handle method which accepts predicate to handle errors. ThrowUnobservedTaskExceptions to configure to shallow exception.
- 13. Task Relationships Task Task Task Task Child Tasks Task Task Task Chained Task
- 14. Task Relationships... ContinueWhenXXX can be used to chain up tasks with TaskContinuationOptions enum for various conditions. TaskCreationOptions.AttachedToParent is used to create child tasks. Creating child task will reflect exception in parent task if exception occurs. Task.Run uses TaskCreationOptions.DenyChildAttach by default which will act as nested task.
- 16. Presenter: XXXX XXXX, Mindfire Solutions Question and Answer
- 17. References Pro Asynchronous Programming with .NET Asynchronous Programming Patterns Asynchronous Programming in .NET: I'll Call You Bac (For definition)
- 18. Presenter: Vikash Kumar, Mindfire Solutions Thank you