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Existing project templates target .NET Core 1.1
If only the .NET Core 2.0 SDK is installed then the projects will fail to run due to the 1.1 runtime being unavailable. To target .NET Core 2.0 the TargetFramework in the project will need to be edited to target netcoreapp2.0 or netstandard2.0. Alternatively the dotnet cli installed with the .NET Core 2.0 SDK can be used to create the project with the correct dependencies and target framework.
.NET Core App 2.0 Project
Package restore will fail to resolve 'Microsoft.NETCore.App (>= 2.0.0)'.
The RuntimeFrameworkVersion needs to be added to the project for restore to complete successfully.
.NET Standard 2.0 Project
By default the .NETStandard.Library 1.6.1 package will be used since the .NET Core sdk files that ship with Mono's MSBuild define that as the default version.
A workaround is to add the NETStandardImplicitPackageVersion to the project.
-->By Scott Addie
This article explains how to update an existing ASP.NET Core 2.1 project to ASP.NET Core 2.2.
Prerequisites
- Visual Studio 2019 with the ASP.NET and web development workload
Warning
If you use Visual Studio 2017, see dotnet/sdk issue #3124 for information about .NET Core SDK versions that don't work with Visual Studio.
The Visual Studio Code instructions use the .NET Core CLI for ASP.NET Core development functions such as project creation. You can follow these instructions on any platform (macOS, Linux, or Windows) and with any code editor. Minor changes may be required if you use something other than Visual Studio Code.
Update Target Framework Moniker (TFM)
Projects targeting .NET Core should use the TFM of a version greater than or equal to .NET Core 2.2. In the project file, update the
<TargetFramework>
node's inner text with netcoreapp2.2
:Projects targeting .NET Framework may continue to use the TFM of a version greater than or equal to .NET Framework 4.6.1:
Adopt the IIS in-process hosting model
To adopt the in-process hosting model for IIS, add the
<AspNetCoreHostingModel>
property with a value of InProcess
to a <PropertyGroup>
in the project file:The in-process hosting model isn't supported for ASP.NET Core apps targeting .NET Framework.
For more information, see ASP.NET Core Module.
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Update a custom web.config file
For projects that use a custom web.config file in the project root to generate their published web.config file:
- In the
<handlers>
entry that adds the ASP.NET Core Module (name='aspNetCore'
), change themodules
attribute value fromAspNetCoreModule
toAspNetCoreModuleV2
. - In the
<aspNetCore>
element, add the hosting model attribute (hostingModel='InProcess'
).
For more information and example web.config files, see ASP.NET Core Module.
Update package references
If targeting .NET Core, remove the metapackage reference's
Version
attribute in the project file. Inclusion of a Version
attribute results in the following warning:For more information, see Microsoft.AspNetCore.App metapackage for ASP.NET Core.
The metapackage reference should resemble the following
<PackageReference />
node:If targeting .NET Framework, update each package reference's
Version
attribute to 2.2.0 or later. Here are the package references in a typical ASP.NET Core 2.2 project targeting .NET Framework:If referencing the Microsoft.AspNetCore.Razor.Design package, update its
Version
attribute to 2.2.0 or later. Failure to do so results in the following error:Update .NET Core SDK version in global.json
If your solution relies upon a global.json file to target a specific .NET Core SDK version, update its
version
property to the 2.2 version installed on your machine:Update launch settings
If using Visual Studio Code, update the project's launch settings file (.vscode/launch.json). The
program
path should reference the new TFM:Update Kestrel configuration
If the app calls UseKestrel by calling
CreateDefaultBuilder
in the CreateWebHostBuilder method of the Program
class, call ConfigureKestrel
to configure Kestrel server instead of UseKestrel
in order to avoid conflicts with the IIS in-process hosting model:If the app doesn't call
CreateDefaultBuilder
and builds the host manually in the Program
class, call UseKestrelbefore calling ConfigureKestrel
:For more information, see Kestrel web server implementation in ASP.NET Core.
Update compatibility version
Update the compatibility version in
Startup.ConfigureServices
to Version_2_2
:Update CORS policy
In ASP.NET Core 2.2, the CORS middleware responds with a wildcard origin (
*
) if a policy allows any origin and allows credentials. Credentials aren't supported when a wildcard origin (*
) is specified, and browsers will disallow the CORS request. For more information, including options for correcting the problem on the client, see the MDN web docs.To correct this problem on the server, take one of the following actions:
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- Modify the CORS policy to no longer allow credentials. That is, remove the call to AllowCredentials when configuring the policy.
- If credentials are required for the CORS request to succeed, modify the policy to specify allowed hosts. For example, use
builder.WithOrigins('https://api.example1.com', 'https://example2.com')
instead of using AllowAnyOrigin.
Update Docker images
The following table shows the Docker image tag changes:
2.1 | 2.2 |
---|---|
microsoft/dotnet:2.1-aspnetcore-runtime | mcr.microsoft.com/dotnet/core/aspnet:2.2 |
microsoft/dotnet:2.1-sdk | mcr.microsoft.com/dotnet/core/sdk:2.2 |
Change the
FROM
lines in your Dockerfile to use the new image tags in the preceding table's 2.2 column.Build manually in Visual Studio when using IIS in-process hosting
Visual Studio's Auto build on browser request experience doesn't function with the IIS in-process hosting model. You must manually rebuild the project when using in-process hosting. Improvements to this experience are planned for a future release of Visual Studio.
Update logging code
Recommended logging configuration code didn't change from 2.1 to 2.2, but some 1.x coding patterns that still worked in 2.1 no longer work in 2.2.
If your app does logging provider initialization, filtering, and configuration loading in the
Startup
class, move that code to Program.Main
:- Provider initialization:1.x example:2.2 example:
- Filtering:1.x example:2.2 example:
- Configuration loading:1.x example:2.2 example:
For more information, see Logging in .NET Core and ASP.NET Core