In some numerical code I noticed that a debug and release build when compiled for x86 or with AnyCPU+"Prefer 32-bit" gave different results. I have broken my code down to pretty much the bare minim...

I want to write a custom code analyzer in Visual Studio 2015 for a C# ConsoleApplication. For this reason I don't want to create a seperate "Analyzer with Code Fix" project from template, because t...

I've a ClassDeclarationSyntax from a syntax tree in roslyn. I read it like this: var tree = SyntaxTree.ParseText(sourceCode); var root = (CompilationUnitSyntax)tree.GetRoot(); var classes = root....

I am using Roslyn to modify the syntax of C# files. Using CSharpSyntaxRewriter, it is very easy to find and replace nodes in the syntax tree. However, the generated code is very ugly and won't even...

Suppose I have a call in the code, SomeClass.SomeStaticMethod<T>(), which is an InvocationExpressionSyntax. I get name of the generic type T as string (from IdentifierNameSyntax). I tried to...

Question as in the title. From an object of type AttributeSyntax how can I get the related AttributeData representation in order to access the metadata?

I created a simple console application via dotnet new console <Project Sdk="Microsoft.NET.Sdk"> <PropertyGroup> <OutputType>Exe</OutputType> <TargetFramework>netc...

I created a console application project (targeting .NET Core 3.0) and a class library (targeting .NET Standard 2.0). The console application tries to use the Roslyn compiler to compile some C# code...

After installing VS 2015, running csc.exe from command line causes this message to be displayed to console: This compiler is provided as part of the Microsoft (R) .NET Framework, but only suppo...

If using System.Linq; is present and System.Linq is among the referenced assemblies, I expect Completions on an int[] array to return LINQ extension methods, e.g. Select<>(...), Where<>...

I'm working on a project where we are using Roslyn to compile some templates for us. Now when I'm compiling the template I'm receiving multiple errors in the CompileResult.Diagnostics. The errors ...

I have an ArgumentSyntax in some invocation expression, how can I get corresponding IParameterSymbol in the IMethodSymbol of the invocation? Since I have seen ArgumentSyntax.NameColonSyntax, which ...

I created a Source Generator to extend (partial) classes which fulfill certain criteria. To check and view the generated code I enabled the emission of these files by adding the following to my pro...

I encountered this confusing names-resolution problem while trying to convert legacy solution with .NET 4.6.1 projects to the new SDK-style project formats. I was able to create a minimal repro sol...

I have this project using C# Source Generators. https://github.com/efonsecab/PTIMicroservicesGenerators The issue I'm having is that I get this issue when compiling the Console App CSC : warning C...

In Visual Studio 2015 (after installing the SDK preview), I created a 'diagnostic with code fix' project. The skeleton code is full of interesting types such as DiagnosticAnalyzer (under Micr...

I am going to be dynamically compiling and executing code using Roslyn like the example below. I want to make sure the code does not violate some of my rules, like: Does not use Reflection Does no...

I get this error when I build the code using my fork of StackExchange.Precompilation - https://github.com/MarkKharitonov/StackExchange.Precompilation So I took it (following the advice in https://m...

Context I was able to debug my source generator in VS 2019 by setting the project properties/debug Launch to Roslyn Component, then the target project combo to one of my consuming project: Now th...

Roslyn Source Generator has now a IIncrementalGenerator interface that makes obsolete old ISourceGenerator implementations. BUT IIncrementalGenerator looks "confusing" and lacks of Full D...

I'm writing a code analyzer with Roslyn, and I need to check if an ExpressionSyntax is of type Task or Task<T>. So far I have this: private static bool IsTask(ExpressionSyntax expression, S...

Edit3: At some point this just started working. No clue why. Maybe it was a VS bug that got fixed? Edit2: Looking into the Analyzers node in solution explorer, I've discovered the source generator ...

I'm having an issue regarding trying to compile my .NET 5 application to a single file executable while debugging through Visual Studio. My .csproject file is below. <Project Sdk="Microsoft...

C# Interactive seems a lot more powerful than the Immediate Window (at least it handles lambda expressions that are often used in LINQ - see Visual Studio debugging "quick watch" tool and...

From a press release yesterday on InfoWorld regarding the new Microsoft Roslyn: The most obvious advantage of this kind of "deconstructed" compiler is that it allows the entire compile-execute ...