c# - 使用 ConcurrentDictionary GetOrAdd 的随机内存不足异常

Question

有时我的代码会给我“内存不足异常”，它会在执行我的并行循环 5 或 10 分钟后随机引发。File.ReadAllLines(line)抛出异常当我禁用缓存计时器时，一切正常。我有 2 个 190MB 的文件，每 5 秒读取一次。代码部分形成我的应用程序：

class MC {
        private readonly ConcurrentDictionary<string, Lazy<string[]>> _files = new ConcurrentDictionary<string, Lazy<string[]>>();
        private readonly Timer _cache =  new Timer();

        private MC ()
            {
                _cache.Enabled = true;
                _cache.Interval = (int) Settings.Default.fileCache*1000; //seconds
                _cache.Elapsed += (sender, args) => _files.Clear();
                _cache.Start();

                Parallel.ForEach(lines, options, (line, loopState, idx) =>
                                                    {
                                                    //code
                     string[] resultStrings = {};
                     var fileKey = GetMD5Hash(line); 
                     resultStrings = _files.GetOrAdd(fileKey, new Lazy<string[]>(() => File.ReadAllLines(line),
        LazyThreadSafetyMode.ExecutionAndPublication)).Value;
                     Fun(string.Join("", resultStrings.OrderBy(x => GetThreadRandom().Next()).Take(10)));                                           //code
                                                    }

            }

    }

来自并行 lopp 的行看起来像（它有 100 000 000 条记录）：

c:\a.txt
c:\b.txt
c:\a.txt
c:\b.txt
c:\a.txt
c:\b.txt
c:\a.txt
c:\b.txt
c:\a.txt
c:\b.txt
c:\a.txt
c:\b.txt