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Tag: aspnetcore

56 posts · Page 3 of 6

2026-06-25 csharp dotnet dotnet-11

Why your ASP.NET Core JWT returns 401 even with a valid token

A valid token that still 401s almost always means the bearer handler never ran or ran under the wrong scheme. Check middleware order, the default scheme, the scheme name, and whether the header even reached the handler.

2026-06-23 csharp dotnet dotnet-11

How to register and resolve keyed services in .NET 11 dependency injection

Register more than one implementation of the same interface under a key with AddKeyedSingleton/Scoped/Transient, then resolve them with [FromKeyedServices], GetRequiredKeyedService, or KeyedService.AnyKey. The keyed and non-keyed registries are separate, which is the gotcha that bites most people.

2026-06-22 csharp dotnet dotnet-11

How to validate a JWT's issuer, audience, and lifetime in ASP.NET Core 11

A complete guide to TokenValidationParameters in ASP.NET Core 11: how ValidateIssuer, ValidateAudience, and ValidateLifetime work, what the defaults actually are, why Authority auto-configures the issuer and signing keys, the 5-minute ClockSkew trap, and how to read the IDX error codes when a valid-looking token is rejected.

2026-06-21 csharp dotnet dotnet-11

How to configure CORS for a JWT-protected API in ASP.NET Core 11

A complete guide to CORS for a bearer-token API in ASP.NET Core 11: the correct UseCors ordering relative to authentication, why a bearer token in the Authorization header is not a CORS credential, why AllowAnyHeader works but a manual wildcard does not cover Authorization, and how to keep preflight from failing.

2026-06-16 blazor dotnet-11 aspnetcore

Blazor static SSR gets [SupplyParameterFromSession] in .NET 11 Preview 5

Reading session state in static server-rendered Blazor meant reaching into HttpContext.Session and serializing by hand. .NET 11 Preview 5 adds [SupplyParameterFromSession] so a component property binds to a session key directly.

2026-06-15 comparison aspnetcore dotnet-11

Minimal API validation vs FluentValidation in ASP.NET Core 11: which should you pick?

Use the built-in source-generated validation for synchronous, attribute-expressible rules in ASP.NET Core 11; reach for FluentValidation when you need async rules, complex cross-field logic, or validation kept out of your domain models.

2026-06-14 comparison dotnet aspnetcore

HybridCache vs IMemoryCache vs IDistributedCache in .NET 11: which should you pick?

Default to HybridCache for new caching code in .NET 11. Reach for IMemoryCache only when you need raw single-server speed with no serialization, and IDistributedCache only as a backing store. Here is the decision matrix.

2026-06-12 errors aspnetcore dotnet

Fix: The antiforgery token could not be decrypted in ASP.NET Core

The error means Data Protection lost the key that signed the token. Persist keys to a shared, durable store and call SetApplicationName so every instance reads the same key ring.

2026-06-11 blazor dotnet-11 aspnetcore

Blazor static SSR forms get client-side validation in .NET 11 Preview 5

Static server-rendered Blazor forms could only validate after a full POST round-trip. .NET 11 Preview 5 renders validation metadata so the Blazor JS enforces DataAnnotations rules in the browser, no circuit required.

2026-06-09 errors blazor dotnet

Fix: its render mode is not supported by the parent component's render mode (Blazor)

You put @rendermode on a child whose parent is already interactive. A subtree has exactly one render mode. Remove the child directive or move it to the boundary.