.NET Core introduces a new symbol file (PDB) format - portable PDBs. Unlike traditional PDBs which are Windows-only, portable PDBs can be created and read on all platforms.

You could embed source code into pdb following ways :

• Adding EmbedAllSources property into csproj file

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <EmbedAllSources>true</EmbedAllSources>
    [...]

• Adding Files explicitly via csproj

<ItemGroup>
      <EmbeddedFiles Include="@(Compile) " />
</ItemGroup>

dotnet ExtractSourceCodeFromPortablePDB.dll -i <folder path of pdb files> -o <folder path where source code will be saved>