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## PreserveCompilationContext is no longer configured by default for ASP.NET Core apps targeting .NET 6 and newer `PreserveCompilationContext` is an MSBuild property that causes .NET Core projects to emit additional...

Breaking change
Documented
6.0.0

## Assemblies removed from Microsoft.AspNetCore.App shared framework As part of our ongoing work to reduce the size of the ASP.NET Core shared framework, the following assemblies were removed from the...

Breaking change
Documented
6.0.0

## WebEventDescriptor.EventArgsType replaced by WebEventDescriptor.EventName The `Microsoft.AspNetCore.Components.RenderTree.WebEventDescriptor` class is part of Blazor's internal protocol for communicating events from JavaScript into .NET. This class is not typically used by application code....

Announcement
Breaking change
Documented
6.0.0

## Change to parameter name in RequestImageFileAsync The parameter `maxWith` in the `RequestImageFileAsync` method was renamed from `maxWith` to `maxWidth` to address a typo. ### Version introduced 6.0.0-preview1 ### Old...

Announcement
Breaking change
Documented
6.0.0

## HttpsRedirectionMiddleware will throw if there are multiple ambiguous https ports The HttpsRedirectionMiddleware (UseHttpsRedirection) will now throw an InvalidOperationException if it finds multiple https ports in the server config. "Cannot...

Announcement
Breaking change
Documented
6.0.0

## Kestrel logging ID changes Kestrel log messages have associated IDs and names. These are used to uniquely identify different kinds of log messages. Some of those IDs and names...

Breaking change
Documented
6.0.0

## Notice on obsoleted RazorEngine APIs in Razor Types related to the `RazorEngine` type in Blazor have been obsoleted. ### Version introduced 6.0.0-preview1 ### Old behavior APIs were not obsolete....

Announcement
Documented
6.0.0

## Rationale Since we enabled GitHub Discussions, we've found them quite hard to manage for a repository the size of aspnetcore. Without labelling and assigning capabilities, there are no effective...

Announcement
For contributors

# Microsoft Security Advisory CVE-2021-1723 | .NET Core Denial of Service Vulnerability ## Executive summary Microsoft is releasing this security advisory to provide information about a vulnerability in ASP.NET Core...

Security
3.1.11
5.0.2

## Changes to routing logic in Blazor applications on 5.0.1 There was a bug in the blazor routing implementation that affected how we computed the precedence of routes. This might...

Announcement
Breaking change
5.0.0
Documented