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Tag: aspnetcore

93 posts · Page 1 of 10

2026-10-07 comparison redis aspnetcore

Redis key prefix vs separate database vs separate instance for multi-tenant caching in ASP.NET Core

Use a tenant key prefix on one shared Redis for almost every multi-tenant ASP.NET Core app, move only tenants with contractual isolation or noisy workloads to their own instance, and skip numbered databases: Redis Cluster, Azure Managed Redis and Redis Cloud only have database 0.

2026-09-25 errors aspnetcore dotnet-10

Fix: ASP.NET Core returns 400 "The X field is required" for a non-nullable string property

With <Nullable>enable</Nullable>, MVC treats every non-nullable reference type as [Required(AllowEmptyStrings = true)]. Mark optional properties as string?, give them a default, or set SuppressImplicitRequiredAttributeForNonNullableReferenceTypes.

2026-09-24 errors blazor aspnetcore

Fix: Unable to find the required 'IAuthenticationService' service with [Authorize(Policy = ...)] in Blazor

A Blazor Web App page with [Authorize] becomes an endpoint the AuthorizationMiddleware checks, and a failed check calls ChallengeAsync, which needs AddAuthentication. Register a real scheme, or pass component endpoints through to AuthorizeRouteView.

2026-09-23 dotnet-10 httpclient resilience

Fix: custom DelegatingHandler does not run again on each retry with AddStandardResilienceHandler

A DelegatingHandler registered before AddStandardResilienceHandler runs once per logical request, not once per retry. Move it after the resilience handler, and make it idempotent, because the retry re-sends the same HttpRequestMessage. Measured on Microsoft.Extensions.Http.Resilience 10.10.0 and 8.10.0.

2026-09-23 dotnet-10 dotnet-11 configuration

Fix: IConfiguration.Bind does not populate an array or List<T> property from appsettings.json

The binder silently skips array properties without a public setter, get-only IReadOnlyList<T>, fields and init-only members under the source generator, and it appends to defaults instead of replacing them. Measured on .NET 10.0.12 and 11 RC 1.

2026-09-22 aspnetcore dotnet-11 minimal-apis

How to disable antiforgery validation for a single minimal API form endpoint in ASP.NET Core 11

Call .DisableAntiforgery() on the one endpoint, or on a MapGroup. In ASP.NET Core 11 that opts out of both the token middleware and the new automatic CSRF check. Measured matrix, precedence traps, and narrower alternatives.

2026-09-15 errors aspnetcore dotnet-10

Fix: ASP.NET Core API endpoints return 401 instead of redirecting to the login page after upgrading to .NET 10

In .NET 10 cookie auth answers API-style endpoints with 401/403 instead of a login redirect. Restore it per endpoint, globally, or with an AppContext switch.

2026-09-14 dotnet-11 dotnet csharp

How to Create and Extract ZIP Files Asynchronously with the ZipArchive Async APIs in .NET 11

Use ZipFile.CreateFromDirectoryAsync, ExtractToDirectoryAsync, ZipArchive.CreateAsync and ZipArchiveEntry.OpenAsync without hidden synchronous I/O. Measured on .NET 11 RC 1 and .NET 10.0.12, including the .NET 10 bug that still blocks Kestrel.

2026-09-13 aspnetcore minimal-apis dotnet-11

How to bind a complex query-string object with [AsParameters] in a minimal API in ASP.NET Core 11

Put [AsParameters] on a class or record to bind a whole query-string filter in an ASP.NET Core 11 minimal API. Covers defaults, arrays, enums, nested objects, validation, OpenAPI, and a Native AOT generator bug with positional records.

2026-09-11 csharp csharp-15 dotnet-11

C# Unions in ASP.NET Core 11: Bodies, SignalR, and OpenAPI Work, Query Strings Do Not

The ASP.NET Core team mapped out where C# 15 union types flow through .NET 11: minimal API and MVC bodies, SignalR's JsonHubProtocol, Blazor, and OpenAPI anyOf schemas. Route, query, header, and form binding are not supported yet.