.NET Tips and Tricks

Blog archive

Pulling Objects from Web Services with ReadAsAsync

In an earlier post, I discussed the three objects that Microsoft has provided for calling Web Services: HttpWebRequest, WebClient and HttpClient. At the time, I suggested WebClient was the simplest solution, unless you wanted to take advantage of HttpClient's asynchronous processing.

I've reconsidered that choice since then and I'm currently using HttpClient almost exclusively. Part of the reason is that HttpClient gives me the ReadAsAsync method. To understand why I like that method so much, you have to compare it to the alternatives.

Here's how to get a list of Customer objects out of the response from a Web Service using the traditional ReadAsStringAsync method:

HttpClient hc = new HttpClient();
HttpResponseMessage customersRm = await hc.GetAsync(url);
string customersString = await customersRm.Content.ReadAsStringAsync();
List<Customer> custs = JsonConvert.DeserializeObject<List<Customer>>(customersString);

Now here's the code using ReadAsAsync (even the method name is shorter!):

HttpClient hc = new HttpClient();
HttpResponseMessage customersRm = await hc.GetAsync(url);
List<Customer> custs = await customersRm.Content.ReadAsAsync<List<Customer>>();

The only problem is that you don't, in .NET 4.5 or later, get ReadAsAsync without some work -- you'll have to add the Microsoft.AspNet.WebApi.Client NuGet package to your project to pick up this extension method. I think that's worth doing.

Posted by Peter Vogel on 04/25/2019 at 8:58 AM


comments powered by Disqus

Featured

  • ML.NET Improves Object Detection

    Microsoft improved the object detection capabilities of its ML.NET machine learning framework for .NET developers, adding the ability to train custom models with Model Builder in Visual Studio.

  • More Improvements for VS Code's New Python Language Server

    Microsoft announced more improvements for the new Python language server for Visual Studio Code, Pylance, specializing in rich type information.

  • Death of the Dev Machine?

    Here's a takeaway from this week's Ignite 2020 event: An advanced Azure cloud portends the death of the traditional, high-powered dev machine packed with computing, memory and storage components.

  • COVID-19 Is Ignite 2020's Elephant in the Room: 'Frankly, It Sucks'

    As in all things of our new reality, there was no escaping the drastic changes in routine caused by the COVID-19 pandemic during Microsoft's big Ignite 2020 developer/IT pro conference, this week shifted to an online-only event after drawing tens of thousands of in-person attendees in years past.

  • Visual Studio 2019 v16.8 Preview Update Adds Codespaces

    To coincide with the Microsoft Ignite 2020 IT pro/developer event, the Visual Studio dev team shipped a new update, Visual Studio 2019 v16.8 Preview 3.1, with the main attraction being support for cloud-hosted Codespaces, now in a limited beta.

Upcoming Events