How to make a asynchronous web api call from asp.net?

Question

I am trying to implement asynchronous web api call from asp.net

My code is similar like this

var response = httpClient.PostAsJsonAsync("api/apicontroller/execute/", executeModel).Result;

This is working in synchronous mode.

I do not want to wait for my webapi call to complete. How I can implement this using .net framework 4?

Nilzor · Accepted Answer · 2013-12-13 08:41:49Z

2

Change the line to:

var response = await httpClient.PostAsJsonAsync("api/apicontroller/execute/", executeModel);

Checking the Result property makes it synchronous. Also make sure your method signature contains the async keyword.

edit: If you don't want to wait for the result right away, you can postpone the await like this (or never perform it):

var task = httpClient.PostAsJsonAsync("api/apicontroller/execute/", executeModel);
/* Do other stuff in parallell here */
var result = await task;

edited Dec 13, 2013 at 8:41

answered Dec 13, 2013 at 8:29

Nilzor

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Comments

Stephen Cleary · Accepted Answer · 2013-12-13 13:30:13Z

1

How I can implement this using .net framework 4?

You can't use async, await, or HttpClient on ASP.NET 4. They all require ASP.NET 4.5. Your options are to upgrade to ASP.NET 4.5 and use the natural await syntax or to stay on ASP.NET 4 and use something like WebClient.

answered Dec 13, 2013 at 13:30

Stephen Cleary

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2 Comments

Daniel Mann Over a year ago

There's also the Microsoft.Bcl.Async package on NuGet, if you're using .NET 4.0 in VS2012.

Stephen Cleary Over a year ago

@DanielMann: No. Microsoft.Bcl.Async is not supported on ASP.NET. It's only for desktop/mobile/store projects.

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