Disable nullable reference types in all files

disabler.linqpad

const string sourcePath = @"C:\src\autoguru\src\Microservices";
const string enabledHeader = "#nullable enable";
const string disabledHeader = "#nullable disable";

var files = Directory.GetFiles(sourcePath, "*.cs", SearchOption.AllDirectories);
var projFiles = Directory.GetFiles(sourcePath, "*.csproj", SearchOption.AllDirectories);

foreach (var file in files)
{
	var contents = File.ReadAllText(file);
	
	if (contents.StartsWith(enabledHeader))
	{
		// remove as we'll be setting enabled at project level
		File.WriteAllText(file, contents.Substring(enabledHeader.Length).TrimStart(), System.Text.Encoding.UTF8);
		//Console.WriteLine($"Enable header removed from: {file}.");
	}
	else if (contents.StartsWith(disabledHeader))
	{
		// skip
	}
	else
	{
		// add disabled header on files we'll migrate over as time allows
		File.WriteAllText(file, $"{disabledHeader}{Environment.NewLine}{Environment.NewLine}{contents}", System.Text.Encoding.UTF8);
		//Console.WriteLine($"Disable header added to: {file}.");
	}
}

const string projEnable = "<Nullable>enable</Nullable>";
foreach (var projFile in projFiles)
{
    var contents = File.ReadAllText(projFile);
	if (!contents.Contains(projEnable))
	{
		Console.WriteLine($"Please add {projEnable} into: {projFile}.");
	}
}