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Release notes for version 2.150.x #9505

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184 changes: 184 additions & 0 deletions CHANGELOG.md
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- Diagnostics related feature requests and improvements [#5951](https://github.com/dotnet/vscode-csharp/issues/5951)
- Debug from .csproj and .sln [#5876](https://github.com/dotnet/vscode-csharp/issues/5876)

# 2.150.x

This update brings improved C# language features, parallel project loading for faster startup, extensive new Razor code actions and navigation support, remote debugging capabilities, full XAML C# expression support for MAUI, and `.slnx` solution file support.

## C# Language Support

### Nullable annotations in Quick Info for delegates

Quick Info tooltips now display nullable annotations for delegate types, giving clearer visibility into nullability contracts without navigating to the definition. ([roslyn#84195](https://github.com/dotnet/roslyn/pull/84195))

### Interceptor information in Quick Info

Quick Info now shows interceptor method information when hovering over intercepted calls, making it easier to understand source-generated code behavior. ([roslyn#83254](https://github.com/dotnet/roslyn/pull/83254))

### CodeLens references for extension block methods

CodeLens now correctly displays references for methods declared in extension blocks. Previously, these references were missing. ([roslyn#84157](https://github.com/dotnet/roslyn/pull/84157))

### Move static members refactoring

The "Move static members to another type" refactoring now works in VS Code. ([roslyn#83696](https://github.com/dotnet/roslyn/pull/83696))

### Local functions in top-level statements

The "Convert to local function" refactoring now works correctly in files using top-level statements. ([roslyn#83279](https://github.com/dotnet/roslyn/pull/83279))

### `[method:]` attribute target for primary constructors

The Forward Attribute With Method Name (`[method: MyGenerator]`) feature now supports targeting primary constructors. ([roslyn#79609](https://github.com/dotnet/roslyn/pull/79609))

### Fixed false positive IDE0004 (unnecessary cast) for nullable generic types

The "Remove unnecessary cast" diagnostic no longer fires incorrectly when casting nullable generic type arguments. ([roslyn#83326](https://github.com/dotnet/roslyn/pull/83326))

### Fixed false positive for collection expression infinite constructor chains

A spurious "infinite chain of calls" error no longer appears in collection expressions when the target type has both a parameterless constructor and a `params` constructor. ([roslyn#82591](https://github.com/dotnet/roslyn/pull/82591))

### Fixed doc comment autocomplete corrupting existing `///` declarations

Triggering XML doc comment completion on a member that already has a `///` prefix no longer duplicates or corrupts the declaration. ([roslyn#83648](https://github.com/dotnet/roslyn/pull/83648))

### Fixed signature help selecting wrong overload for generic extension methods

Signature help now correctly identifies the active overload when multiple extension methods differ only in the number of type parameters. ([roslyn#84089](https://github.com/dotnet/roslyn/pull/84089))

### Fixed multiline lambda formatting in attributes

Multiline lambda expressions inside non-directive attributes are now formatted correctly. ([roslyn#84121](https://github.com/dotnet/roslyn/pull/84121))

### File-based app improvements

- File-based apps now use a single MSBuild node for design-time builds, fixing reliability issues with concurrent builds. ([roslyn#84183](https://github.com/dotnet/roslyn/pull/84183))
- Dot-prefixed directories (e.g., `.git`) are no longer incorrectly discovered as file-based app projects. ([roslyn#83547](https://github.com/dotnet/roslyn/pull/83547))

## Performance

### Parallel project loading

The language server now loads projects in parallel using multiple MSBuild nodes, significantly reducing solution load times for large workspaces. ([roslyn#83982](https://github.com/dotnet/roslyn/pull/83982))

### Progress reporting during project loading

A percentage-based progress indicator now appears during project loading, providing better visibility into how far along the language server is in initializing your workspace. ([roslyn#83785](https://github.com/dotnet/roslyn/pull/83785))

### Faster SuppressMessage attribute processing

The language server no longer eagerly decodes all `SuppressMessageAttribute` instances up front, reducing initial load time and memory usage. ([roslyn#83087](https://github.com/dotnet/roslyn/pull/83087))

### Reduced memory pressure from large Razor completion lists

Razor completion lists are now capped at 1000 items to prevent memory pooling issues with large responses. ([roslyn#84194](https://github.com/dotnet/roslyn/pull/84194))

### Fixed leaked event handlers

A memory leak caused by event handlers in the refresh queue and project system has been fixed. ([roslyn#83561](https://github.com/dotnet/roslyn/pull/83561))

## Razor

### Razor is now built into the Roslyn language server

Razor support is now a built-in feature of the Roslyn language server rather than a separate extension component. This simplifies the architecture and improves reliability. Razor logs now appear in the main C# output window. ([vscode-csharp#9277](https://github.com/dotnet/vscode-csharp/pull/9277), [vscode-csharp#9368](https://github.com/dotnet/vscode-csharp/pull/9368))

### Type Hierarchy support

Razor files now support the Type Hierarchy feature, allowing you to explore base types and derived types from within `.razor` and `.cshtml` files. ([roslyn#83637](https://github.com/dotnet/roslyn/pull/83637))

### Call Hierarchy support

You can now use Call Hierarchy in Razor files to navigate incoming and outgoing calls for C# methods referenced in your markup. ([roslyn#83548](https://github.com/dotnet/roslyn/pull/83548))

### Selection Range support

Smart selection expand/shrink now works in Razor files, respecting the structure of mixed HTML and C# content. ([roslyn#83514](https://github.com/dotnet/roslyn/pull/83514))

### Prepare Rename support

Razor now validates rename operations before prompting for a new name, preventing attempts to rename non-renameable symbols. ([roslyn#83599](https://github.com/dotnet/roslyn/pull/83599))

### Implement Interface and Implement Abstract Class

The **Implement Interface** and **Implement Abstract Class** code actions now work directly in Razor files. ([roslyn#83636](https://github.com/dotnet/roslyn/pull/83636), [roslyn#83638](https://github.com/dotnet/roslyn/pull/83638))

### Generate Type, Constructor, Property, and Field

Code actions for generating types, constructors, properties, and fields are now available in Razor files, reducing the need to switch to a separate C# file. ([roslyn#83491](https://github.com/dotnet/roslyn/pull/83491), [roslyn#83478](https://github.com/dotnet/roslyn/pull/83478), [roslyn#83450](https://github.com/dotnet/roslyn/pull/83450))

### Parallelized completion requests

HTML and Razor completion requests are now parallelized, improving completion responsiveness especially in large Razor files. ([razor#13092](https://github.com/dotnet/razor/pull/13092))

### Fixed `@{` completion regression in CSHTML files

Typing `@{` in `.cshtml` files once again correctly triggers code block completion. ([roslyn#83919](https://github.com/dotnet/roslyn/pull/83919))

### Fixed "hintName must be unique" build error

Some Razor projects that encountered a "hintName must be unique" error from the source generator no longer hit this issue. ([roslyn#83878](https://github.com/dotnet/roslyn/pull/83878))

### Fixed source generator crash on misplaced preprocessor directives

The Razor source generator no longer crashes when encountering a misplaced preprocessor directive in disabled text. ([roslyn#84159](https://github.com/dotnet/roslyn/pull/84159))

### Fixed crash with generic component type arguments

A crash that occurred when lowering a generic component type argument with mixed literal and expression content has been fixed. ([roslyn#83645](https://github.com/dotnet/roslyn/pull/83645))

### Fixed formatting issues

- Multiline expressions in attributes are now formatted correctly. ([roslyn#83566](https://github.com/dotnet/roslyn/pull/83566))
- Self-closing multiline templates are now formatted correctly. ([razor#13069](https://github.com/dotnet/razor/pull/13069))
- Single-line script tags are now formatted correctly. ([roslyn#83721](https://github.com/dotnet/roslyn/pull/83721))

### Fixed completion issues

- Snippets and tag helper completions are no longer shown in end-tag contexts. ([roslyn#83573](https://github.com/dotnet/roslyn/pull/83573))
- Razor completion is no longer triggered when `@` is typed in an Emmet numbering context (e.g., `li*3>a@`). ([roslyn#83837](https://github.com/dotnet/roslyn/pull/83837))
- Directive attribute completions now work correctly. ([roslyn#83559](https://github.com/dotnet/roslyn/pull/83559))
- Tag helper attribute completions with `ParentTag` constraints now work correctly. ([roslyn#83455](https://github.com/dotnet/roslyn/pull/83455))
- False-positive suggestion mode in implicit expression completions has been cleared. ([roslyn#83463](https://github.com/dotnet/roslyn/pull/83463))

### Fixed `@using` code action with existing directives

The "Add using" code action in Razor files no longer fails when other directives are already present at the top of the file. ([roslyn#83448](https://github.com/dotnet/roslyn/pull/83448))

### Fixed `bind-*:after` property accessor collision

Razor no longer generates conflicting `_` identifiers in `bind-*:after` property accessor code. ([roslyn#83572](https://github.com/dotnet/roslyn/pull/83572))

## Debugging

### Remote CoreCLR debugging

The extension now supports attaching the .NET debugger to remote CoreCLR processes, enabling debugging of applications running on remote machines or containers. ([vscode-csharp#8667](https://github.com/dotnet/vscode-csharp/pull/8667))

### Fixed crash with in-memory symbols

A regression that caused the debugger to crash when debugging projects that use in-memory symbols (PDBs not written to disk) has been fixed. ([vscode-csharp#9335](https://github.com/dotnet/vscode-csharp/pull/9335))

## MAUI

### Full XAML C# Expression support

XAML C# Expressions (XEXPR) are now fully supported, enabling richer data binding and expression evaluation in XAML files. ([vscode-csharp#9261](https://github.com/dotnet/vscode-csharp/pull/9261))

### Hot Reload improvements

- `MetadataUpdateHandlers` are now correctly invoked in all MAUI app scenarios, fixing cases where hot reload changes were not applied. ([vscode-csharp#9409](https://github.com/dotnet/vscode-csharp/pull/9409))
- XAML Hot Reload reliability has been improved with end-to-end diagnostics support. ([vscode-csharp#9409](https://github.com/dotnet/vscode-csharp/pull/9409))

## Editor Experience

### `.slnx` solution file support

The extension now recognizes `.slnx` solution files (the new XML-based solution format) wherever `.sln` files were previously supported, including the Open Solution command. ([vscode-csharp#9286](https://github.com/dotnet/vscode-csharp/pull/9286))

### Roslyn Copilot component respects AI settings

The Roslyn Copilot language server component is no longer installed or loaded when AI features are disabled in settings, reducing resource usage for users who don't use AI-assisted features. The extension prompts for reload when the setting changes. ([vscode-csharp#9196](https://github.com/dotnet/vscode-csharp/pull/9196))

### Improved language server shutdown reliability

The language server now shuts down cleanly when its mutex is closed and no longer blocks shutdown on JSON-RPC stream completion, reducing cases of orphaned server processes. ([roslyn#83921](https://github.com/dotnet/roslyn/pull/83921), [roslyn#83930](https://github.com/dotnet/roslyn/pull/83930))

# 2.140.x

This update brings new language features like Type Hierarchy and Call Hierarchy, major file-based apps improvements, significant performance gains, extensive Razor formatting and editing enhancements, Blazor WebAssembly debugging, and MAUI tooling improvements.
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