How Can I Reliably Test Write Access to a Directory in C#?

A More Robust Method for Verifying Write Access to a Directory in C#

Directly checking directory write permissions can be unreliable. Simply querying permissions doesn't guarantee actual write access. A more dependable approach involves attempting a write operation.

Here's an improved method:

<code class="language-csharp">public bool IsDirectoryWritable(string dirPath, bool throwIfFails = false)
{
    try
    {
        // Create a temporary file to test write access.  It's automatically deleted.
        using (FileStream fs = File.Create(Path.Combine(dirPath, Path.GetRandomFileName()), 1, FileOptions.DeleteOnClose)) { }
        return true;
    }
    catch (Exception ex)
    {
        if (throwIfFails)
            throw; // Re-throw the exception for higher-level handling
        else
            return false;
    }
}</code>

This function attempts to create a temporary file within the target directory. The FileOptions.DeleteOnClose ensures the file is automatically removed, leaving no trace. Success indicates write access; failure returns false (or throws the exception if throwIfFails is true). This directly tests write capability, avoiding the pitfalls of relying solely on permission checks. It's concise and easy to understand.

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