I have migrated a .net core 2.2 project to 3.1 When I have tried to exeute dotnet publish command and ended up with the following errors
C:\Program Files\dotnet\sdk\3.1.100\Sdks\Microsoft.NET.Sdk.Publish\targets\TransformTargets\Microsoft.NET.Sdk.Publish.TransformFiles.targets(50,5): error MSB4018: The “TransformWebConfig” task failed unexpectedly.
C:\Program Files\dotnet\sdk\3.1.100\Sdks\Microsoft.NET.Sdk.Publish\targets\TransformTargets\Microsoft.NET.Sdk.Publish.TransformFiles.targets(50,5): error MSB4018: System.Exception: In process hosting is not supported for AspNetCoreModule. Change the AspNetCoreModule to at least AspNetCoreModuleV2.
C:\Program Files\dotnet\sdk\3.1.100\Sdks\Microsoft.NET.Sdk.Publish\targets\TransformTargets\Microsoft.NET.Sdk.Publish.TransformFiles.targets(50,5): error MSB4018: at Microsoft.NET.Sdk.Publish.Tasks.WebConfigTransform.TransformAspNetCore(XElement aspNetCoreElement, String appName, Boolean configureForAzure, Boolean useAppHost, String extension, String aspNetCoreModuleName, String aspNetCoreHostingModelValue, String projectFullPath)
C:\Program Files\dotnet\sdk\3.1.100\Sdks\Microsoft.NET.Sdk.Publish\targets\TransformTargets\Microsoft.NET.Sdk.Publish.TransformFiles.targets(50,5): error MSB4018: at Microsoft.NET.Sdk.Publish.Tasks.WebConfigTransform.SetAspNetCoreHostingModel(String aspNetCoreHostingModelValue, String aspNetCoreModuleName, XElement aspNetCoreElement)
C:\Program Files\dotnet\sdk\3.1.100\Sdks\Microsoft.NET.Sdk.Publish\targets\TransformTargets\Microsoft.NET.Sdk.Publish.TransformFiles.targets(50,5): error MSB4018: at Microsoft.NET.Sdk.Publish.Tasks.WebConfigTransform.Transform(XDocument webConfig, String appName, Boolean configureForAzure, Boolean useAppHost, String extension, String aspNetCoreModuleName, String aspNetCoreHostingModel, String environmentName, String projectFullPath)
C:\Program Files\dotnet\sdk\3.1.100\Sdks\Microsoft.NET.Sdk.Publish\targets\TransformTargets\Microsoft.NET.Sdk.Publish.TransformFiles.targets(50,5): error MSB4018: at Microsoft.NET.Sdk.Publish.Tasks.TransformWebConfig.Execute()
C:\Program Files\dotnet\sdk\3.1.100\Sdks\Microsoft.NET.Sdk.Publish\targets\TransformTargets\Microsoft.NET.Sdk.Publish.TransformFiles.targets(50,5): error MSB4018: at Microsoft.Build.BackEnd.TaskExecutionHost.Microsoft.Build.BackEnd.ITaskExecutionHost.Execute()
C:\Program Files\dotnet\sdk\3.1.100\Sdks\Microsoft.NET.Sdk.Publish\targets\TransformTargets\Microsoft.NET.Sdk.Publish.TransformFiles.targets(50,5): error MSB4018: at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(ITaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask)
So, this was how i fixed those errors by adding the following property in the project file
<PropertyGroup>
<IsTransformWebConfigDisabled>true</IsTransformWebConfigDisabled>
</PropertyGroup>I find the solution in this microsoft document
To prevent the Web SDK from transforming the web.config file, use the <IsTransformWebConfigDisabled> property in the project file
Host ASP.NET Core on Windows with IIS
However, thanks for reaching the post. Please leave a comment if it helps