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Incremental Source Generator generated code passed compilation with syntax error

I made a Incremental Source Generator:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>netstandard2.0</TargetFramework>
<IsRoslynComponent>true</IsRoslynComponent>
<LangVersion>latest</LangVersion>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.CodeAnalysis" Version="4.2.0" />
<PackageReference Include="System.Text.Json" Version="6.0.0" />
</ItemGroup>
</Project>
It generates code that has an obvious syntax error
[Generator]
public class SourceGenerator : IIncrementalGenerator {
public void Initialize(IncrementalGeneratorInitializationContext context) {
context.RegisterSourceOutput(context.AdditionalTextsProvider, static (context, name) => {
string sourceCode = $#"
public class {"AAA"}{{
{{
}}
";
context.AddSource("AAA" + ".g.cs", sourceCode);
});
}
After building the solution for the first time and errors were expected. I restarted Visual Studio. I can see following code was generated:
public class AAA{
{
}
When viewing this AAA.g.cs, the text editor didn't highlight the fault of less closing braket.
Then I build the solution for the second time. It was succeeded. How can this be possible?

C#: Unhandled exception. System.TypeLoadException: Could not load type 'System.Drawing.Color'

ANSWER for this question thanks to Jeremy C.:
There is no KeePass nuget package for the Net5.0 yet. Thats why there is that error message. Thanks Jeremy C. for the help and answers.
QUESTION:
Im getting this error after starting my solution.
Unhandled exception. System.TypeLoadException: Could not load type 'System.Drawing.Color' from assembly 'Splat, Version=3.0.0.0, Culture=neutral, PublicKeyToken=null'.
Already used google and tried to find a fix for it and also red all articles about similiar errors like "System.Drawing.Font" or "System.Drawing.Image". But theres nothing really helpful and nothing really informative about 'System.Drawing.Color'.
Ive got the code example and package from here:
github.com/wismna/ModernKeePassLib
This is my code:
.csproj
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net5.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="ModernKeePassLib" Version="2.45.1" />
<PackageReference Include="System.Drawing.Common" Version="5.0.2" />
</ItemGroup>
</Project>
And:
using ModernKeePassLib;
using ModernKeePassLib.Interfaces;
using ModernKeePassLib.Keys;
using ModernKeePassLib.Serialization;
using System;
using System.Linq;
using System.Text;
namespace KeePasso
{
class Program
{
static void Main()
{
var dbpath = #"C:\Users\prusinma\Desktop\KeePassDatabase\Database.kdbx";
var keypath = #"C:\Users\prusinma\Desktop\KeePassDatabase\Database.key";
var masterpw = "1234abcd";
Console.WriteLine("init done");
byte[] DBPathBytes = Encoding.ASCII.GetBytes(dbpath);
byte[] KeyPathBytes = Encoding.ASCII.GetBytes(keypath);
var ioConnection = IOConnectionInfo.FromByteArray(DBPathBytes);
var compositeKey = new CompositeKey();
compositeKey.AddUserKey(new KcpPassword(masterpw)); // Password
compositeKey.AddUserKey(new KcpKeyFile(IOConnectionInfo.FromByteArray(KeyPathBytes))); // Keyfile
var db = new PwDatabase();
db.Open(ioConnection, compositeKey, new NullStatusLogger());
var kpdata = from entry in db.RootGroup.GetEntries(true)
select new
{
Group = entry.ParentGroup.Name,
Title = entry.Strings.ReadSafe("Title"),
Username = entry.Strings.ReadSafe("UserName"),
Password = entry.Strings.ReadSafe("Password"),
URL = entry.Strings.ReadSafe("URL"),
Notes = entry.Strings.ReadSafe("Notes")
};
db.Save(new NullStatusLogger());
var contents = db.IOConnectionInfo.Bytes;
string bitString = BitConverter.ToString(contents);
Console.WriteLine(bitString);
Console.WriteLine(kpdata.ToString());
}
}
}

Those classes were moved into their own nuget package. Add it to your project and you should be good to go: https://www.nuget.org/packages/System.Drawing.Common/
From the project directory at the command line:
dotnet add package System.Drawing.Common
Closer inspection reveals ModernKeepPass targets.netstandard1.2 and will not work with 5's System.Drawing nuget package without being upgraded to target the new framework.
https://github.com/wismna/ModernKeePassLib/blob/master/ModernKeePassLib/ModernKeePassLib.csproj
<PropertyGroup>
<TargetFramework>netstandard1.2</TargetFramework>

Edit and Continue doesn't work with Roslyn compiled class library

Background
I'm trying to get Edit and Continue to work with a class library I'm compiling at runtime using Roslyn. This is for adding modding support to a game I'm developing.
Breakdown of problem
I have one class library project (A) with source files (.cs)
I have another console application project (B) in another solution that does the following:
Compiles all of project A's source files
Emits a dll and pdb
Loads the emitted dll and pdb via an assembly context
Calls a static method defined within project B
My desire is to be able to attach a debugger to a running process of project B in an instance of VS with project A loaded and be able to break, edit project A's code, and continue with my changes being executed
Currently, I am only able to break and continue
Any edits lead to the following notification:
This source file has changed. It no longer matches the version of the file used to build the application being debugged.
Source
Project A: DebuggableClassLibrary.csproj
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net5.0</TargetFramework>
</PropertyGroup>
</Project>
Project A: Test.cs
using System;
namespace DebuggableClassLibrary
{
public class Test
{
public static int Ct = 0;
public static void SayHello()
{
Ct++;
Console.WriteLine("Hello World");
}
}
}
Project B: DynamicLoading.csproj
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net5.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="3.8.0" />
</ItemGroup>
</Project>
Project B: Program.cs
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.Emit;
using System;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Loader;
using System.Text;
namespace DynamicLoading
{
class Program
{
static void Main(string[] args)
{
var references = new MetadataReference[]
{
MetadataReference.CreateFromFile(Assembly.Load("System.Runtime").Location),
MetadataReference.CreateFromFile(typeof(object).Assembly.Location),
MetadataReference.CreateFromFile(typeof(Console).Assembly.Location)
};
var files = Directory.GetFiles(#"C:\Users\mrbri\source\repos\DebuggableClassLibrary\DebuggableClassLibrary", "*.cs");
var assemblyName = "DebuggableClassLibrary.dll";
var debug = true;
var allowUnsafe = false;
var outputDirectory = #"C:\Users\mrbri\Documents\Test";
var preprocessorSymbols = debug ? new string[] { "DEBUG" } : new string[] { };
var parseOptions = new CSharpParseOptions(LanguageVersion.Latest, preprocessorSymbols: preprocessorSymbols);
var compilation = CSharpCompilation.Create(
assemblyName: assemblyName,
syntaxTrees: files.Select(f => SyntaxFactory.ParseSyntaxTree(File.ReadAllText(f), parseOptions, f, Encoding.UTF8)),
references: references,
options: new CSharpCompilationOptions(
OutputKind.DynamicallyLinkedLibrary,
assemblyIdentityComparer: DesktopAssemblyIdentityComparer.Default,
optimizationLevel: debug ? OptimizationLevel.Debug : OptimizationLevel.Release,
allowUnsafe: allowUnsafe
));
var pePath = Path.Combine(outputDirectory, assemblyName);
var pdbPath = Path.Combine(outputDirectory, Path.ChangeExtension(assemblyName, ".pdb"));
using (var peStream = new FileStream(pePath, FileMode.Create))
using (var pdbStream = new FileStream(pdbPath, FileMode.Create))
{
var results = compilation.Emit(
peStream: peStream,
pdbStream: pdbStream,
options: new EmitOptions(debugInformationFormat: DebugInformationFormat.PortablePdb)
);
}
var assemblyLoadContext = new SimpleUnloadableAssemblyLoadContext();
var assembly = assemblyLoadContext.LoadFromStream(File.OpenRead(pePath), File.OpenRead(pdbPath));
var type = assembly.GetTypes().First();
var method = type.GetMethod("SayHello");
while (true)
{
method.Invoke(null, null);
}
}
}
internal class SimpleUnloadableAssemblyLoadContext : AssemblyLoadContext
{
public SimpleUnloadableAssemblyLoadContext(): base(true) { }
protected override Assembly Load(AssemblyName assemblyName) => null;
}
}
Attempts at solutions and observations
Compiling project A manually through VS and loading the generated pdb and dll exactly as I do for the Roslyn compiled one does allow for Edit and Continue
Comparing project A's dlls generated via Roslyn and VS in JetBrains dotPeek did yield some interesting differences that stem from the compilation time generated .NETCoreApp,Version=v5.0.AssemblyAttributes.cs and DebuggableClassLibrary.AssemblyInfo.cs that I do not include when I compile in project B
Going through the trouble of compiling project A via a MSBuildWorkspace Project did not allow Edit and Continue, although did include .NETCoreApp,Version=v5.0.AssemblyAttributes.cs and DebuggableClassLibrary.AssemblyInfo.cs
Alternatives
I am open to Roslyn alternatives/wrappers that do have Edit and Continue support.

Edit and Continue does not support this scenario. The project for the library being edited needs to be loaded in VS (in the current solution) and the program needs to be launched with the debugger attached.

Get ApplicationIcon from Code in NET Core 3.0

In the .csproj I assign an icon to my .NET Core 3.0 application:
<Project Sdk="Microsoft.NET.Sdk.WindowsDesktop">
<PropertyGroup>
<OutputType>WinExe</OutputType>
<TargetFramework>netcoreapp3.0</TargetFramework>
<UseWindowsForms>true</UseWindowsForms>
<ApplicationIcon>C:\temp\myicon.ico</ApplicationIcon>
</PropertyGroup>
</Project>
The icon gets set for the generated exe file and shown in task-manager/file explorer.
How can I access this icon from code? I don't want to extract it from generated exe or add an additional resource icon.

you can extract like this
using System;
using System.Drawing; //For Icon
using System.Reflection; //For Assembly
namespace ConsoleApplication
{
class Program
{
static void Main(string[] args)
{
try
{
//Gets the icon associated with the currently executing assembly
//(or pass a different file path and name for a different executable)
Icon appIcon = Icon.ExtractAssociatedIcon(Assembly.GetExecutingAssembly().Location);
}
catch(ArgumentException ae)
{
//handle
}
}
}
}

//We can use this statement.
using System.Drawing;
using System.Reflection;
static void Main(string[] args)
{
try
{
Icon appIcon = Icon.ExtractAssociatedIcon(Assembly.GetExecutingAssembly().Location);
}
catch(ArgumentException ae)
{
//handle
}

Change project-properties with IWizard

I created a template for a VS-project where I want to set some attributes provided by the user. So I implemented IWizard-interface:
public void RunStarted(object automationObject, Dictionary<string, string> replacementsDictionary, WizardRunKind runKind, object[] customParams)
{
string projectPath = replacementsDictionary["$destinationdirectory$"];
string projectName = replacementsDictionary["$projectname$"];
SchemaWizardForm frm = new SchemaWizardForm(projectPath, projectName);
frm.ShowDialog();
this.m_assemblyInfo = frm.AssemblyInfo;
replacementsDictionary["$assemblyTitle$"] = frm.AssemblyInfo.AssemblyName;
replacementsDictionary["$assemblyName$"] = frm.AssemblyInfo.AssemblyName;
replacementsDictionary["$copyrightYear$"] = DateTime.Now.Month + "/" + DateTime.Now.Year;
replacementsDictionary["$defaultNamespace$"] = frm.AssemblyInfo.RootNamespace;
}
Now within my template´s project-file I have something like this:
<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">x86</Platform>
<ProductVersion>8.0.30703</ProductVersion>
<SchemaVersion>2.0</SchemaVersion>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>$defaultNamespace$</RootNamespace>
<AssemblyName>$assemblyName$</AssemblyName>
<TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
</PropertyGroup>
</Project>
And in AssemblyInfo.cs:
[assembly: AssemblyTitle("$assemblyTitle$")]
[assembly: AssemblyCopyright("(C) $copyrightYear$ MyCompany")]
// ...
I can sucessfully create my project using the wizard. Its copyright-date from AssemblyInfo.cs after generation is [assembly: AssemblyCopyright("(C) 8/2016 MyCompany")] - which is fine. However the RootNamespace has a value similar to the projectsname. I already debugged the above code, where the replacementsDictionary dontains the correct entry for the namespace (see image below).
Here is the result-project
As you can see both the Assembly Name and the Default namespace contain the value from projectsname instead of what I entered in my user-form (asdas in my case). However the copyright-date accessable via the Assembly Information-button at Project-->Propertes-->Application is set correctly (not shown in the image).
Isn´t it possible to change the projects properties themeselfes using a replacementDictionary?

Obviously we can´t change the project´s properties via such a dictionary. What we can do instead is to modify the projectname-entry within this map which solved the issue for me. Now Assembly title, Assembly name and Default namespace all refer to that same variable. It is a bit annoying (in particular that we can´t change the name of the assembly and the namespace independently) but this works for me.
replacementsDictionary["$projectname$"] = frm.AssemblyInfo.ProjectName;
replacementsDictionary["$safeprojectname$"] = frm.AssemblyInfo.ProjectName;