What causes "父目录不能拷贝到子目录！" in egametang/ET?

Place the target directory outside the source tree entirely (sibling, not child).

egametang/ET · error · Exception

Error message

父目录不能拷贝到子目录！

What it means

Thrown by FileHelper.CopyDirectory when the target directory is inside the source directory. Copying a parent into its own child would recurse infinitely (the copy would keep copying itself into the copy), so it is rejected up front.

Solutions

Place the target directory outside the source tree entirely (sibling, not child).
If output must nest, copy to a temp dir outside source first, then move into place.
Validate `!target.FullName.StartsWith(source.FullName)` in your own caller before invoking CopyDirectory.

Example fix

// before
FileHelper.CopyDirectory(src, Path.Combine(src, "out"));   // out is inside src

// after
FileHelper.CopyDirectory(src, Path.Combine(parentOfSrc, "out"));

Defensive patterns

Strategy: validation

Validate before calling

var src = new DirectoryInfo(srcDir).FullName;
var tgt = new DirectoryInfo(tgtDir).FullName;
if (!tgt.StartsWith(src, StringComparison.OrdinalIgnoreCase))
{
    FileHelper.CopyDirectory(srcDir, tgtDir);
}

Prevention

Keep output directories outside the source tree.
Validate containment before copying.
Copy to a temp dir first if nesting is required.

When it happens

Trigger: Passing srcDir as an ancestor of tgtDir; backup/copy tooling that writes the output under the source tree; build scripts whose output dir nests under the input.

Common situations: Generating output into a subfolder of the input; deploy/copy scripts with reversed or misnested paths; tooling that defaults output to ./input/out.

Related errors

AI-assisted analysis of egametang/ET@5cab01f7a8 (2026-08-13). Data as JSON: /api/errors/dbf669faa1435367. Report an issue: GitHub.

Appendix: source

Thrown at Packages/cn.etetet.core/Scripts/Core/Share/Helper/FileHelper.cs:55

			foreach (string subdir in Directory.GetDirectories(dir))
			{
				Directory.Delete(subdir, true);		
			}

			foreach (string subFile in Directory.GetFiles(dir))
			{
				File.Delete(subFile);
			}
		}

		public static void CopyDirectory(string srcDir, string tgtDir)
		{
			DirectoryInfo source = new DirectoryInfo(srcDir);
			DirectoryInfo target = new DirectoryInfo(tgtDir);
	
			if (target.FullName.StartsWith(source.FullName, StringComparison.CurrentCultureIgnoreCase))
			{
				throw new Exception("父目录不能拷贝到子目录！");
			}
	
			if (!source.Exists)
			{
				return;
			}
	
			if (!target.Exists)
			{
				target.Create();
			}
	
			FileInfo[] files = source.GetFiles();
	
			for (int i = 0; i < files.Length; i++)
			{
				File.Copy(files[i].FullName, Path.Combine(target.FullName, files[i].Name), true);
			}

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