dump-files-in-build.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Microsoft.Build.Logging.StructuredLogger;

var build = BinaryLog.ReadBuild(@"p:\roslyn3\artifacts\log\Debug\Build.binlog");
var root = @"p:\roslyn3";
var sourceFileSet = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
build.VisitAllChildren<CscTask>(cscTask =>
{
    Folder parameters = cscTask.FindChild((Folder c) => c.Name == Strings.Parameters);
    if (parameters is null)
    {
        return;
    }

    foreach (var parameter in parameters.Children.OfType<Parameter>().Where(x => x.Name == "Sources"))
    {
        foreach (var child in parameter.Children)
        {
            switch (child)
            {
                case Item item:
                    AddFilePath(item.Text);
                    break;
                default:
                    break;
            }
        }
    }

    void AddFilePath(string filePath)
    {
        if (!Path.IsPathRooted(filePath))
        {
            filePath = Path.Combine(root, filePath);
        }
        sourceFileSet.Add(filePath);
    }
});

using var writer = new StreamWriter(@"p:\temp\files.txt");
foreach (var filePath in sourceFileSet)
{
    writer.WriteLine(filePath);
}