How to Effectively Remove or Replace Illegal Characters in File Paths and Filenames?

Clean illegal characters in file paths and file names

In programming, working with file paths and file names often requires ensuring that they conform to a valid character set to prevent errors or compatibility issues. This includes removing illegal characters. Let's explore an effective solution.

The code snippet provided in the original question attempts to remove illegal path and file characters using the Trim() method. However, it fails to do this because Trim() only operates on leading and trailing whitespace. To remove the required characters we need to use GetInvalidFileNameChars() and GetInvalidPathChars() methods.

Here is a solution to this problem:

public string RemoveInvalidChars(string path)
{
    // 移除非法的文件字符
    path = string.Join("", path.Split(Path.GetInvalidFileNameChars(), StringSplitOptions.RemoveEmptyEntries));

    // 移除非法的路径字符
    path = string.Join("", path.Split(Path.GetInvalidPathChars(), StringSplitOptions.RemoveEmptyEntries));

    return path;
}

This method takes a path as input and removes illegal characters by splitting the string at these points. It effectively removes invalid characters, resulting in a sanitized path.

Alternatively, you can choose to replace illegal characters instead of removing them. Here's one way to do it:

public string ReplaceInvalidChars(string path)
{
    path = string.Join("_", path.Split(Path.GetInvalidFileNameChars(), StringSplitOptions.RemoveEmptyEntries));
    path = string.Join("_", path.Split(Path.GetInvalidPathChars(), StringSplitOptions.RemoveEmptyEntries));

    return path;
}

In this method, we split the string where illegal characters occur and replace them with underscores. This ensures that the string no longer contains illegal characters while remaining readable.

Both methods provide reliable and efficient ways to handle illegal characters in paths and file names, ensuring that they are valid and compatible with operating systems and applications.

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