Tag: dotnet-11

Use the en-IN culture or set NumberFormatInfo.NumberGroupSizes to [3, 2] to print 12,34,56,789 instead of 123,456,789 in C#. Measured on .NET 10 and .NET 11 RC1: how the array works, why CurrencyGroupSizes is separate, the invariant-globalization trap that silently prints Western grouping, and a lakh/crore words helper.

MapIdentityApi<TUser>() maps ten endpoints and has no switch to skip one. Here are four measured ways to deal with that on .NET 11: hide an endpoint from OpenAPI, make it return 404, shadow it, or remove it from routing entirely, plus the /confirmEmail trap that turns registration into a 500.

ref-safe-context is the scope in which a reference to a variable stays valid. Here are the four contexts, the rule that fixes a ref local's context at its initializer, why ref reassignment can never widen or narrow it, and the CS8157, CS8168, CS8374 and CS9079 errors that fall out of it, with compiler output from C# 14 on .NET 10 and .NET 11 RC1.

System.Formats.Cbor 11.0.0-rc.2 adds isFinalBlock, NeedsMoreData, and SlideData to CborReader, so you can decode CBOR straight off a stream without buffering the whole document. Verified on SDK 11.0.100-rc.2.

FileInfo caches its size, enumeration reads NTFS's lazily updated directory entry, and the writer may still hold bytes in its own buffers. Refresh(), or better, read the length from a shared handle with RandomAccess.GetLength.

The tool package targets a newer .NET than the SDK running the install, or it is not a .NET tool at all. Use a newer SDK, pin a tool version with a compatible tools folder, or force --framework.

Balancing groups (?<name>) and (?<-name>) turn a .NET regex capture group into a stack, so one pattern can match arbitrarily nested parentheses or <div> tags. The full pattern, how the stack works, inner-content capture with (?<inner-open>), and the gotchas verified on .NET 11 RC1: the empty-stack check, catastrophic backtracking, NonBacktracking, and mixed bracket types.

A compiled model is generated C# that recreates your EF Core model without running OnModelCreating. Measured on EF Core 11 RC1: model load drops from 714 ms to 215 ms at 500 entities, but the MSBuild route (which replaced EFOptimizeContext) is slower, stale models fail silently, and query filters block generation.

A transparent struct is one the ABI treats exactly like its only field. .NET 11 has no such guarantee: a struct wrapping a double is passed in RCX on Windows x64 but in XMM0 on Linux and macOS. Here is the disassembly from the .NET 11 JIT on three ABIs, the P/Invoke bugs it causes, and how to write wrapper types that are safe at every boundary.

A shadow property is a column EF Core tracks without a matching CLR property. Here is why EF Core 11 creates them (missing FK properties, misnamed FKs, type mismatches, split relationships), how to spot the BlogId1 kind in a migration, how to fix each cause, and how to use shadow properties on purpose.