namespace Example
{
    // partial methods require partial class/struct!
    public partial class ExampleClass
    {
        /*
            The relative file path from C# project folder should be specified.
            The return value type must be System.ReadOnlySpan<byte>.
            No parameter must exist.
            The method must be static and partial.
            The accessibility of the method does not matter.
        */
        [EmbedResourceCSharp.FileEmbed("resourceFileA.txt")]
        private static partial System.ReadOnlySpan<byte> GetFileContentA();
    }
}

namespace Example2
{
    // partial methods require partial class/struct!
    public partial class ExampleClass
    {
        /*
            The relative folder path from C# project folder should be specified. The folder path should end with slash or backslash.
            The return value type must be System.ReadOnlySpan<byte>.
            One parameter must exist and its type must be System.ReadOnlySpan<char>. The parameter name does not matter.
            The method must be static and partial.
            The accessibility of the method does not matter.
        */
        [EmbedResourceCSharp.FolderEmbed("../folderB/", "*.txt")]
        private static partial System.ReadOnlySpan<byte> GetResouceFileContent(System.ReadOnlySpan<char> path);

        public static void Main()
        {
            // Specify relative path from the folder.
            var aContent = GetResouceFileContent("resourceA.txt");
            var bContent = GetResouceFileContent("resourceB.txt");
            var cContent = GetResouceFileContent("folderB_C/resourceC.txt");
            // var dContent = GetResouceFileContent("resourceD.csv");
            // Above method call throws an FileNotFoundException!
        }
    }
}