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Tag: dotnet-11

213 posts · Page 13 of 22

2026-05-17 mcp ai-agents dotnet

dotnet new mcpserver Now Ships in the .NET 11 Preview 4 SDK

.NET 11 Preview 4 bundles the mcpserver project template directly into the SDK. No separate Microsoft.McpServer.ProjectTemplates install, no preview feed dance. Pick stdio or HTTP transport, opt into Native AOT, and dotnet new mcpserver -o MyServer is the whole setup.

2026-05-16 errors dotnet dotnet-11

Fix: Provisioning profile doesn't include the currently selected device in MAUI iOS

The profile Visual Studio picked was generated before this iPhone's UDID was registered. Re-register the device, regenerate the development profile, redownload, redeploy.

2026-05-16 errors dotnet dotnet-11

Fix: Unable to find a valid iOS Simulator runtime during MAUI build

Xcode 15+ ships without bundled iOS simulator runtimes. MAUI fails the build when SupportedOSPlatformVersion has no matching runtime installed. Install one with xcodebuild -downloadPlatform iOS or via Xcode Settings, then verify with xcrun simctl list runtimes.

2026-05-15 dotnet dotnet-11 csharp

.NET 11 Adds Deadlock-Free Process Output Capture

.NET 11 Preview 4 ships new System.Diagnostics.Process APIs that drain stdout and stderr concurrently, plus one-line run-and-capture helpers and KillOnParentExit.

2026-05-15 errors dotnet dotnet-11

Fix: Gradle build failed to produce an .apk file in MAUI Android

Nine out of ten times the real Gradle error is buried higher in the MSBuild log. JDK 17 path, missing maui-android workload, and Windows long paths are the usual root causes.

2026-05-14 errors csharp dotnet

Fix: A possible object cycle was detected

System.Text.Json refuses to serialize graphs with back-references. Set ReferenceHandler.IgnoreCycles, project to a DTO, or mark the back-pointer with [JsonIgnore]. Preserve is a last resort.

2026-05-14 errors csharp dotnet

Fix: SqlException: Timeout expired during EF Core migrations

Migrations use the design-time DbContext, not your runtime CommandTimeout. Set the timeout via UseSqlServer(o => o.CommandTimeout(...)), the connection string Command Timeout, or Database.SetCommandTimeout before Migrate().

2026-05-14 dotnet-11 maui coreclr

MAUI switches to CoreCLR by default on Android, iOS, and Mac Catalyst in .NET 11 Preview 4

.NET 11 Preview 4 makes CoreCLR the default runtime for MAUI on Android, iOS, Mac Catalyst, and tvOS. Mono is still one MSBuild property away. Here is what changes, what breaks, and how to opt out.

2026-05-13 dotnet-11 maui dotnet-watch

dotnet watch finally reaches MAUI on Android and iOS in .NET 11 Preview 4

.NET 11 Preview 4 turns on dotnet watch for Android devices, Android emulators, and the iOS Simulator. Edit, save, and the running app updates without a manual rebuild. One csproj gotcha applies to iOS.

2026-05-13 errors csharp dotnet

Fix: System.Text.Json.JsonException: The JSON value could not be converted

System.Text.Json throws this when the incoming JSON token doesn't match the CLR target type. Match the JSON to the type, or register a JsonConverter or JsonSerializerOption that bridges them.