Question

此代码会在引发OutOfMemoryException之前不断增加内存使用量。我试图强制GC，但它没有帮助，ClusterResultDBDataContext是一个Linq to Sql类。对我来说一切都很好，有人能发现一些问题吗？

    static void getDistinct()
    {
        var db = new ClusterResultDBDataContext();
        var result = new LinkedList<Tuple<int,int>>();
        using(var sw = new StreamWriter("result.txt"))
        {
            foreach(var y in db.Results)
            {
                var cnarr = y.PaperResults
                    .OrderBy(x => x.DOI).Select(x => x.ClusterNumber).ToArray();
                var re = cnarr.Aggregate((x, a) => (x * 10 + a) % 19930727);

                Console.WriteLine(y.ID+" " +re);
                sw.WriteLine(y.ID + ","+re);
                GC.Collect();


                //result.AddLast(new Tuple<int, int>(y.ID, re));
            }
        }

Answer 1

我认为您可以在执行任务和查询后关闭与db的连接，也不应该在每次迭代中调用db.Results。

试试这个：

static void getDistinct()
    {
        using (ClusterResultDBDataContext db = new ClusterResultDBDataContext())
        {
            var result = new LinkedList<Tuple<int, int>>();
            using (var sw = new StreamWriter("result.txt"))
            {
                var results = db.Results;
                foreach (var y in results)
                {
                    var cnarr = y.PaperResults
                    .OrderBy(x => x.DOI)
                    .Select(x => x.ClusterNumber).ToArray();
                    var re = cnarr.Aggregate((x, a) => (x * 10 + a) % 19930727);

                    Console.WriteLine(y.ID + " " + re);
                    sw.WriteLine(y.ID + "," + re);
                }
            }
        }
    }

这种简单的方法使内存使用量不断增加

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