IOException: 进程无法访问文件 'fileName/textFile.txt' 因为它正被另一个进程使用

Question

我看到了关于这个问题的其他话题，但似乎没有一个能解决我的确切问题。

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，在我运行程序并在代码中到达该点后，我收到一条错误消息： “该进程无法访问文件 'fileName/textFile.txt'，因为它正被另一个进程使用。”

Answer 1

您应该在流等一次性对象周围使用 using statement。这将确保对象释放它们持有的所有非托管资源。并且在需要之前不要打开写入器。第一次需要阅读记录时打开编写器是没有意义的

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
    }
}

您还应该考虑到，使用文件是最有可能的上下文之一，在这种情况下，您可能会因程序无法控制的外部事件而收到异常。
最好将所有内容都包含在 try/catch 块中，并正确处理异常

IOException: 进程无法访问文件 'fileName/textFile.txt' 因为它正被另一个进程使用

IOException: The process cannot access the file 'fileName/textFile.txt' because it is being used by another process

c#

streamwriter

streamreader

txt