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TempData.Get() does not consume value when it is the first access on a request

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

Status: Open.

#65720 In dotnet/aspnetcore;

· danroth27 opened on Mar 10, 2026

[dnceng-bot] Branch <code>aspnetcore/release/9.0</code> can't be merged to Azdo internal branch

needs-area-labelUsed by the dotnet-issue-labeler to label those issues which couldn't be triaged automaticallyUsed by the dotnet-issue-labeler to label those issues which couldn't be triaged automatically

Status: Open.

#65712 In dotnet/aspnetcore;

· dotnet-maestro-bot opened on Mar 9, 2026

Web Assembly Renderer Errors

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

Author: Migration Bot 🤖The issue was created by a issue mover bot. The author may not be the actual author.The issue was created by a issue mover bot. The author may not be the actual author.

Status: Open.

#65711 In dotnet/aspnetcore;

· vsfeedback opened on Mar 9, 2026

Blazor WebAssembly fingerprint not replaced on publish

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

Author: Migration Bot 🤖The issue was created by a issue mover bot. The author may not be the actual author.The issue was created by a issue mover bot. The author may not be the actual author.

Needs: Attention 👋This issue needs the attention of a contributor, typically because the OP has provided an update.This issue needs the attention of a contributor, typically because the OP has provided an update.

Status: Open.

#65710 In dotnet/aspnetcore;

· vsfeedback opened on Mar 9, 2026

Extremely long build times with ASP.NET Core

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

Author: Migration Bot 🤖The issue was created by a issue mover bot. The author may not be the actual author.The issue was created by a issue mover bot. The author may not be the actual author.

Needs: Attention 👋This issue needs the attention of a contributor, typically because the OP has provided an update.This issue needs the attention of a contributor, typically because the OP has provided an update.

Status: Open.

#65709 In dotnet/aspnetcore;

· vsfeedback opened on Mar 9, 2026

[Known Build Error] TestServerTests.LongPollingWorks - ObjectDisposedException in OnDisconnectedAsync during shutdown

area-signalrIncludes: SignalR clients and serversIncludes: SignalR clients and servers

Known Build ErrorIssue that should show up in Build AnalysisIssue that should show up in Build Analysis

Status: Open.

#65702 In dotnet/aspnetcore;

· lewing opened on Mar 7, 2026

[Known Build Error] Blazor WASM template tests fail with NU1603: DevServer 10.0.6-ci not found, 10.0.6 resolved instead

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

Known Build ErrorIssue that should show up in Build AnalysisIssue that should show up in Build Analysis

Status: Open.

#65701 In dotnet/aspnetcore;

· lewing opened on Mar 7, 2026

Perf regression: fortunes_dapper, multiple_queries

area-perfPerformance infrastructure issuesPerformance infrastructure issues

perf-regression

Status: Open.

#65700 In dotnet/aspnetcore;

· pr-benchmarks opened on Mar 7, 2026

Perf improvement: antiforgery-noop, https, tls-handshakes-kestrel

area-perfPerformance infrastructure issuesPerformance infrastructure issues

perf-regression

Status: Open.

#65698 In dotnet/aspnetcore;

· pr-benchmarks opened on Mar 7, 2026

Perf regression: antiforgery-validation, fortunes, fortunes_ef

area-perfPerformance infrastructure issuesPerformance infrastructure issues

perf-regression

Status: Open.

#65699 In dotnet/aspnetcore;

· pr-benchmarks opened on Mar 7, 2026

ProblemDetailsContext for CustomizeProblemDetails never contains an Exception for Controllers

area-mvcIncludes: MVC, Actions and Controllers, Localization, CORS, most templatesIncludes: MVC, Actions and Controllers, Localization, CORS, most templates

feature-problem-details

Status: Open.

#65697 In dotnet/aspnetcore;

· Annxii opened on Mar 7, 2026

I can't launch debug after migration from VS 2022 to VS 2026. "Filed to launch debug adapter"

needs-area-labelUsed by the dotnet-issue-labeler to label those issues which couldn't be triaged automaticallyUsed by the dotnet-issue-labeler to label those issues which couldn't be triaged automatically

Status: Open.

#65689 In dotnet/aspnetcore;

· MostRush opened on Mar 6, 2026