「C#] 取得空的磁碟機代碼

最近要做動態掛載遠端磁碟，所以寫了一個method，

可以取得目前沒用到的磁碟代號。

   public char getFreeLabel()
   {
        char letter = ' ';
        ArrayList driveLetters = new ArrayList(26); // Allocate space for alphabet
        for (int i = 65; i < 91; i++) // increment from ASCII values for A-Z
        {
            driveLetters.Add(Convert.ToChar(i)); // Add uppercase letters to possible drive letters
        }

        foreach (string drive in Directory.GetLogicalDrives())
        {
            driveLetters.Remove(drive[0]); // removed used drive letters from possible drive letters
        }

        foreach (char drive in driveLetters)
        {   // get first unused drive letters
            letter = drive;
            break;
        }
        return letter;
    }

會回傳A～Z，如果回傳的是空白，則代表己經沒有空的磁碟機代號了。


參考來源：

https://hardforum.com/threads/c-getting-free-drive-letters.1208456/