How Can I Recursively List Files While Ignoring Access Exceptions in C#?

Handling file access exceptions in Directory.GetFiles()

When using the Directory.GetFiles() method, you may encounter a situation where certain folders or files in the specified directory path cannot be accessed, causing exceptions and interrupting the file listing process. To overcome this limitation and continue to list accessible files while ignoring protected or inaccessible items, a manual recursive approach is recommended.

The

Directory.GetFiles() method natively supports recursion using the AllDirectories parameter. However, this method may be unreliable if access to certain subdirectories is denied, causing the process to terminate abruptly. To solve this problem, a custom recursive approach is needed.

The provided code snippet demonstrates how to gracefully handle access exceptions while recursively listing files in a specified directory. It introduces a new method ApplyAllFiles() that performs a custom recursive search.

In ApplyAllFiles(), the code iterates over each file in the current directory and calls the provided fileAction delegate to process the file. It then lists the subdirectories in the current directory and attempts to apply the same ApplyAllFiles() method to each subdirectory.

If any exception is encountered while trying to access a subdirectory, the code will silently swallow the exception, ensuring that the process continues to list accessible files without interruption.

By adopting this approach, developers can efficiently list files in a directory while ignoring inaccessible folders or files. It allows for more powerful file list manipulation, especially when different subdirectories have different access rights.

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