AWS Developer Tools Blog

New Support for ASP.NET 5 in AWS SDK for .NET

Today we have released beta support for ASP.NET 5 in the AWS SDK for .NET. ASP.NET 5 is an exciting development for .NET developers with modularization and cross-platform support being major goals for the new platform.

Currently, ASP.NET 5 is on beta 7. There may be more changes before its 1.0 release. For this reason, we have released a separate 3.2 version of the SDK (marked beta) to NuGet. We will continue to maintain the 3.1 version as the current, stable version of the SDK. When ASP.NET 5 goes out of beta, we will take version 3.2 of the SDK out of beta.


ASP.NET 5 applications can run on .NET 4.5.2, mono 4.0.1, or the new CoreCLR runtime. If you are targeting the new CoreCLR runtime, be aware of these coding differences:

  • Service calls must be made asynchronously. This is because the HTTP client used for CoreCLR supports asynchronous calls only. Coding your application to use asynchronous operations can improve your application performance because fewer tasks are blocked waiting for a response from the server.
  • The CoreCLR version of the AWS SDK for .NET currently does not support our encrypted SDK credentials store, which is available in the .NET 3.5 and 4.5 versions of the AWS SDK for .NET. This is because the encrypted store uses P/Invoke to make system calls into Windows to handle the encryption. Because CoreCLR is cross-platform, that option is not available. For local development with CoreCLR, we recommend you use the shared credentials file. When running in EC2 instances, Identity and Access Management (IAM) roles are the preferred mechanism for delivering credentials to your application.

AWS re:Invent

If you are attending AWS re:Invent next month, I’m going to address a breakout session about ASP.NET 5 development with AWS and options for deploying ASP.NET 5 applications to AWS.


To give us feedback on ASP.NET 5 support or to suggest AWS features to better support ASP.NET 5, open a GitHub issue on the repository for the AWS SDK for .NET. Check out the dnxcore-development branch to see where the ASP.NET 5 work is being done.