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Tag: dotnet

404 posts · Page 6 of 41

2026-08-24 dotnet maui blazor

.NET MAUI 10.0.100 adds UsePlatformHandler for custom BlazorWebView backends

MAUI 10.0.100 ships MauiBlazorWebViewBuilderExtensions.UsePlatformHandler, a supported seam for replacing BlazorWebViewHandler without reimplementing everything AddMauiBlazorWebView() registers. Two overloads, one ordering trap.

2026-08-23 csharp linq dotnet

How to tell whether an IEnumerable<T> has already been materialized in C#

There is no HasBeenEnumerated flag on IEnumerable<T>. Here is what TryGetNonEnumeratedCount actually checks, why Enumerable.Range passes an ICollection<T> test, and the guard that avoids a wasted ToList().

2026-08-23 ef-core linq csharp

How to write reusable LINQ predicates that EF Core can translate in Where, Select, and OrderBy

A bool helper method throws "could not be translated". An Expression<Func<T, bool>> does not. Here is how to compose, nest, and reuse expression trees in EF Core 11 without LINQKit, with the real SQL for every case.

2026-08-20 aspnetcore dotnet error-handling

ASP.NET Core Stops Turning 413 Into 500 in UseExceptionHandler

A PR merged into dotnet/aspnetcore main on August 19, 2026 makes ExceptionHandlerMiddleware honour BadHttpRequestException.StatusCode instead of overwriting it with 500.

2026-08-20 errors dotnet dotnet-11

Fix: [FromForm] Dictionary<string, string> is always null in a minimal API

A [FromForm] Dictionary in a minimal API binds with an empty prefix: the form keys must be [key], not metadata[key]. Wrap it in a class to keep readable names.

2026-08-20 mcp agent-skills microsoft-agent-framework

How to Serve Agent Skills from an MCP Server in .NET with UseMcpSkills

Stop shipping SKILL.md folders inside every agent deployment. Serve them from an MCP server and pull them with UseMcpSkills on Microsoft.Agents.AI.Mcp 1.18. Includes the exact skill://index.json shape, a working C# server, the wire trace, and the SEP-2640 drift that will bite you.

2026-08-19 errors ef-core dotnet

Fix: "An exception was thrown while attempting to evaluate a LINQ query parameter expression" in EF Core 11

EF Core throws this when a client-evaluated piece of your query throws while EF evaluates it. Read InnerException, turn on EnableSensitiveDataLogging, and move the null check outside the lambda.

2026-08-19 dotnet semantic-kernel ai-agents

Semantic Kernel 1.80.0 Stops OpenAPI Plugins From Following Redirects

Semantic Kernel .NET 1.80.0 ships a breaking change: the OpenAPI plugin's default HttpClient no longer follows redirects, closing an SSRF bypass. Here is what changes and why your own HttpClient reopens the hole.

2026-08-18 errors dotnet logging

Fix: CA1873 "Evaluation of this argument may be expensive and unnecessary if logging is disabled"

CA1873 fires on the implicit params object[] allocation, so almost every LogDebug call trips it. Fix it with [LoggerMessage] or an IsEnabled guard.

2026-08-18 errors dotnet csharp

Fix: 'MapperConfiguration' does not contain a constructor that takes 1 arguments

AutoMapper 15 removed the single-argument MapperConfiguration constructor. Pass an ILoggerFactory as the second argument, and add a config action to every AddAutoMapper call.