Check if a path is a file or a directory: retarget net10.0, add Path.Exists, guard File.GetAttributes

[vladimir-pecanac-main]

Sample update for the article "Check if a Path Exists and Is a File or a Directory in C#" (https://code-maze.com/csharp-path-file-or-directory/). Touches only files-csharp/CheckPathFileOrDirectoryCSharp.

Changes:

• Both projects retargeted from net7.0 to net10.0.
• FileAttributesUsage: the try/catch that caught only FileNotFoundException is replaced by a Path.Exists() guard. File.GetAttributes() throws DirectoryNotFoundException when a parent directory of the path is missing, and the old catch let that through.
• File.CreateText(path) replaced by File.WriteAllText(path, string.Empty) in seven files, so the returned StreamWriter is no longer left open.
• FileInfoAndDirectoryInfoDrawbacks now calls Refresh() and prints the fresh answer after the stale one.
• New PathExistsUsage class (called from Program.cs) and a new PathTypeWithPathExistsIntegrationTest with three tests: true for a file, true for a directory, false for a missing path.
• MSTest 4 rename: Assert.ThrowsException becomes Assert.ThrowsExactly at the one call site.
• Five unused usings removed from FileInfoAndDirectoryInfoDrawbacks; FileAttributesUsage, FileInfoAndDirectoryInfoUsage and FileInfoAndDirectoryInfoDrawbacks made static.

Packages, re-queried from api.nuget.org on 2026-09-23 (newest stable, all listed):

• Microsoft.NET.Test.Sdk 17.7.1 -> 18.10.1 (the batch plan said 18.10.0; the re-query wins)
• MSTest.TestAdapter 2.2.10 + MSTest.TestFramework 2.2.10 -> MSTest 4.4.1 meta-package (the batch plan said 4.4.0; the re-query wins)
• coverlet.collector 3.2.0 -> 10.0.1

Verified locally on SDK 10.0.302, runtime .NET 10.0.10: dotnet build -c Release 0 warnings, 0 errors; dotnet test 12 passed, 0 failed (9 existing + 3 new); dotnet list package --vulnerable --include-transitive reports no vulnerable packages on either project.