Skip to main content

Going from Tasks back to IAsyncResult(the Asynchronous Programming Model pattern)

There are lot’s of posts out there talking about how to go from the traditional APM approach(using the typical BeginXXX and EndXXX syntax with IAsyncResult) to the Task based approach. Probably the easiest way is by using the Task.Factory.FromAsync method.

But what if you want to do it the other way around and want to go back from a task to the APM way of working?

In my specific case I wanted to wrap the async version of ExecuteNonQuery that returns a Task<int>:

Task<int> ExecuteNonQueryAsync();

It had to be mapped to an APM implementation with the following signatures:

IAsyncResult BeginExecuteNonQuery(DbCommand command, AsyncCallback callback, object state);
int EndExecuteNonQuery(IAsyncResult asyncResult);

I started by implementing it myself but there a lot of edge cases, so I was happy to find the following extension method :

The implementation of my BeginExecuteNonQuery method became:

And the implementation of my EndExecuteNonQuery method became:

A similar solution could be found on Stephen Cleary’s blog who created a useful Helper library for async task-based programming called Nito AsyncEx.

Popular posts from this blog

DevToys–A swiss army knife for developers

As a developer there are a lot of small tasks you need to do as part of your coding, debugging and testing activities.  DevToys is an offline windows app that tries to help you with these tasks. Instead of using different websites you get a fully offline experience offering help for a large list of tasks. Many tools are available. Here is the current list: Converters JSON <> YAML Timestamp Number Base Cron Parser Encoders / Decoders HTML URL Base64 Text & Image GZip JWT Decoder Formatters JSON SQL XML Generators Hash (MD5, SHA1, SHA256, SHA512) UUID 1 and 4 Lorem Ipsum Checksum Text Escape / Unescape Inspector & Case Converter Regex Tester Text Comparer XML Validator Markdown Preview Graphic Color B

Help! I accidently enabled HSTS–on localhost

I ran into an issue after accidently enabling HSTS for a website on localhost. This was not an issue for the original website that was running in IIS and had a certificate configured. But when I tried to run an Angular app a little bit later on http://localhost:4200 the browser redirected me immediately to https://localhost . Whoops! That was not what I wanted in this case. To fix it, you need to go the network settings of your browser, there are available at: chrome://net-internals/#hsts edge://net-internals/#hsts brave://net-internals/#hsts Enter ‘localhost’ in the domain textbox under the Delete domain security policies section and hit Delete . That should do the trick…

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.