Using Roslyn to Mass Format a Solution (No .editorconfig support)

Program.cs

namespace TestRosylnFormatter
{
    using Microsoft.Build.Locator;
    using Microsoft.CodeAnalysis;
    using Microsoft.CodeAnalysis.CSharp.Formatting;
    using Microsoft.CodeAnalysis.Formatting;
    using Microsoft.CodeAnalysis.MSBuild;
    using Microsoft.CodeAnalysis.Options;
    using System;
    using System.IO;

    class Program
    {
        static void Main(string[] args)
        {
            MSBuildLocator.RegisterDefaults();

            string solutionPath = @"S:\Code\Client.sln";
            using (MSBuildWorkspace msWorkspace = MSBuildWorkspace.Create())
            {
                Solution solution = msWorkspace.OpenSolutionAsync(solutionPath).Result;

                // Really wish I could get this to load options from .editorconfig
                OptionSet formattingOptions =
                    msWorkspace.Options
                    .WithChangedOption(CSharpFormattingOptions.SpaceAfterComma, true)
                    .WithChangedOption(CSharpFormattingOptions.SpaceWithinExpressionParentheses, false)
                    .WithChangedOption(CSharpFormattingOptions.SpaceWithinMethodCallParentheses, true)
                    .WithChangedOption(CSharpFormattingOptions.SpaceWithinOtherParentheses, true)
                    .WithChangedOption(CSharpFormattingOptions.SpaceWithinMethodDeclarationParenthesis, true)
                    .WithChangedOption(CSharpFormattingOptions.SpaceAfterMethodCallName, false)
                    .WithChangedOption(CSharpFormattingOptions.SpaceAfterCast, false)
                    .WithChangedOption(CSharpFormattingOptions.SpaceAfterControlFlowStatementKeyword, false)
                    .WithChangedOption(FormattingOptions.IndentationSize, LanguageNames.CSharp, 4)
                    .WithChangedOption(FormattingOptions.TabSize, LanguageNames.CSharp, 4)
                    .WithChangedOption(FormattingOptions.UseTabs, LanguageNames.CSharp, true);

                foreach (Project project in solution.Projects)
                {
                    //Parallel.ForEach(project.Documents, document =>
                    foreach (Document document in project.Documents)
                    {
                        if (!document.Name.EndsWith("designer.cs", StringComparison.InvariantCultureIgnoreCase))
                        {
                            Console.WriteLine($"Formatting {document.Name} in {project.Name}");
                            SyntaxNode formattedDocument = Formatter.Format(document.GetSyntaxRootAsync().Result, msWorkspace, formattingOptions);

                            // Its unclear how to make Roslyn save the source documents; this feels really hacky
                            using (StreamWriter sw = new StreamWriter(document.FilePath, false, new System.Text.UTF8Encoding(true)))
                            {
                                formattedDocument.WriteTo(sw);
                            }
                        }
                    }
                    //);
                }
            }
        }
    }
}