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Add first-class guidance + libraries for WebMCP in ASP.NET Core / Blazor

Status: Open.

#65981 In dotnet/aspnetcore;

· jongalloway opened on Mar 25, 2026

Perf regression: kestrel-header-symbols

area-perfPerformance infrastructure issuesPerformance infrastructure issues

perf-regression

Status: Open.

#65979 In dotnet/aspnetcore;

· pr-benchmarks opened on Mar 25, 2026

Authentication cookies are not flowing from blazor web assembly to signalr

area-blazorIncludes: Blazor, Razor ComponentsIncludes: Blazor, Razor Components

Blazor ♥ SignalRThis issue is related to the experience of Signal R and Blazor working togetherThis issue is related to the experience of Signal R and Blazor working together

Status: Open.

#65974 In dotnet/aspnetcore;

· LucasSavassa opened on Mar 25, 2026

Quarantine ServerVirtualizationTest flaky tests (CanRenderHtmlTable and CanElevateEffectiveMaxItemCount_WhenOverscanExceedsMax)

test-failure

Status: Open.

#65962 In dotnet/aspnetcore;

· github-actions opened on Mar 25, 2026

Quarantine ServerRoutingTest.NavigationLock_OverlappingNavigationsCancelExistingNavigations_HistoryNavigation

test-failure

Status: Open.

#65961 In dotnet/aspnetcore;

· github-actions opened on Mar 25, 2026

Perf regression: fortunes_ef, fortunes_ef

area-perfPerformance infrastructure issuesPerformance infrastructure issues

perf-regression

Status: Open.

#65960 In dotnet/aspnetcore;

· pr-benchmarks opened on Mar 25, 2026

Perf improvement: tls-handshakes-kestrel

area-perfPerformance infrastructure issuesPerformance infrastructure issues

perf-regression

Status: Open.

#65959 In dotnet/aspnetcore;

· pr-benchmarks opened on Mar 25, 2026

ACNM: Dependency provider use the same key for both arm64 and x64

area-infrastructureIncludes: MSBuild projects/targets, build scripts, CI, Installers and shared frameworkIncludes: MSBuild projects/targets, build scripts, CI, Installers and shared framework

bugThis issue describes a behavior which is not expected - a bug.This issue describes a behavior which is not expected - a bug.

feature-installersIncludes: InstallersIncludes: Installers

Status: Open.

#65953 In dotnet/aspnetcore;

· joeloff opened on Mar 24, 2026

·  

11.0-preview4

MapStaticAssets causes HTTP error 405 on POSTs with UseWhen

Needs: Author FeedbackThe author of this issue needs to respond in order for us to continue investigating this issue.The author of this issue needs to respond in order for us to continue investigating this issue.

Status: Open.

#65940 In dotnet/aspnetcore;

· ecosFWinkel opened on Mar 24, 2026

Virtualize: visible content shifts when in-DOM items above the viewport change height

area-blazorIncludes: Blazor, Razor ComponentsIncludes: Blazor, Razor Components

bugThis issue describes a behavior which is not expected - a bug.This issue describes a behavior which is not expected - a bug.

feature-blazor-virtualizationThis issue is related to the Blazor Virtualize componentThis issue is related to the Blazor Virtualize component

Status: Open.

#65939 In dotnet/aspnetcore;

· ilonatommy opened on Mar 24, 2026

·  

.NET 11 Planning

Perf improvement: json, json

area-perfPerformance infrastructure issuesPerformance infrastructure issues

perf-regression

Status: Open.

#65938 In dotnet/aspnetcore;

· pr-benchmarks opened on Mar 24, 2026

.NET Web Worker template cleanup

area-blazorIncludes: Blazor, Razor ComponentsIncludes: Blazor, Razor Components

feature-request

Status: Open.

#65937 In dotnet/aspnetcore;

· danroth27 opened on Mar 24, 2026