IOException：该过程无法访问文件＆＃x27; filename/textfile.txt＆＃x27;因为另一个过程正在使用它

Question

我看到了有关此问题的其他线程，但似乎没有解决我的确切问题。

static void RecordUpdater(string username,int points,string term) //Updates Record File with New Records.
        {
            int minPoints = 0;
            StreamWriter streamWriter = new StreamWriter($@"Record\{term}");
            Player playersRecord = new Player(points, username);
            List<Player> allRecords = new List<Player>();
            StreamReader reader = new StreamReader($@"Record\{term}");
            while (!reader.EndOfStream)
            {
                string[] splitText = reader.ReadLine().Split(',');
                Player record = new Player(Convert.ToInt32(splitText[0]), splitText[1]);
                allRecords.Add(record);
            }
            
            reader.Close();

            foreach (var playerpoint in allRecords )
            {
                if(minPoints > playerpoint.points)
                    minPoints = playerpoint.points;
            }
            if (points > minPoints)
            {

                allRecords.Add(playersRecord);
                allRecords.Remove(allRecords.Min());
            }
            allRecords.Sort();
            allRecords.Reverse();
            streamWriter.Flush();
            foreach (var player in allRecords)
            {
                streamWriter.WriteLine(player.points + "," + player.username);
            }
        }

因此，在运行程序并在代码中达到这一点后，我会收到一个错误消息： “该过程无法访问文件'fileName/textfile.txt'，因为另一个过程正在使用它。”

Answer 1

You should use the using statement around disposable objects like streams.这将确保对象释放其持有的所有不受管理的资源。并且在需要之前，不要打开作者。首先需要阅读记录时，打开作者毫无意义，

static void RecordUpdater(string username,int points,string term) 
{
    Player playersRecord = new Player(points, username);
    List<Player> allRecords = new List<Player>();
    int minPoints = 0;
    try
    {
        using(StreamReader reader = new StreamReader($@"Record\{term}"))
        {
            while (!reader.EndOfStream)
            {
                .... load you data line by line
            }
        }        

        ..... process your data .....

        using(StreamWriter streamWriter = new StreamWriter($@"Record\{term}"))
        {
            ... write your data...
        }
    }
    catch(Exception ex)
    {
        ... show a message about the ex.Message or just log everything
            in a file for later analysis
    }
}

您也应该考虑使用文件是最可能的上下文之一，因为您的程序无法控制。<<<<<<<<< br>
最好将所有内容包装在try/catch block with proper handling of the exception