如何提高 for 循环性能？-解网

问：

当 belgeList.length = 200 时，它会在 16 秒内完成循环。但是，当我想列出 200 多个时，我期望更多。我怎样才能加快这个循环？

internal DtResult documentCheckList(AksBelgeKontrolData[] belgeList, string dmUser = null)
{

    if ((dmUser == null) || (dmUser == "") || (CurrentDomain == "nvi.local"))
        dmUser = "MERNIS\\************";
    
    
    Stopwatch sw = new Stopwatch();
    sw.Start();
    for (int i = 0; i < belgeList.Length; i++)
    {
        var belgeData = belgeList[i];
        var anaBelgeTur = belgeData.AnaBelgeTur;

        if (anaBelgeTur == AnaBelgeTur.AksYeniBelge)
        {
            belgeList[i].BelgeVar = GdAksYeniQueries.AksBelgeKontrolu(belgeData, dmUser);
        }
        else if (anaBelgeTur == AnaBelgeTur.TckkYeniBelge)
        {
            belgeList[i].BelgeVar = GdTckkYeniQueries.TckkBelgeKontrolu(belgeData, dmUser);
        }
        //else if (anaBelgeTur == AnaBelgeTur.MernisBelge)
        //{
        //    belgeList[i].BelgeVar = GdMernisQueries.MernisBelgeKontrolu(belgeData, dmUser);
        //}
    }

    DtResult result = new DtResult { ResultState = DtResultState.Ok };
  
    result.BelgeKontrolListesi = belgeList;
    sw.Stop();
    var test = sw.ElapsedMilliseconds;
    return result;

}

C# .NET 性能循环 for 循环

从我可以得出的结论是，您正在循环（，）内启动对外部源（数据库或API等）的查询。作为一般考虑因素，应避免在循环中对每个元素进行外部源查询。相反，在循环之前以批处理模式进行一个查询。将数据保存在内存中。然后迭代元素并针对已获取的数据进行处理。GdAksYeniQueriesGdTckkYeniQueries

如果不适合在一个查询中提取所有数据，请仍实现迭代解决方案，该解决方案将根据可配置的批大小提取数据。

0赞 Manel Solis 5/31/2023 #2

若要加快 for 循环，可以考虑使用并行处理技术在多个线程或处理器之间分配工作负载。下面是一个示例，说明如何使用 Parallel.For 修改代码以利用并行处理：

internal DtResult documentCheckList(AksBelgeKontrolData[] belgeList, string dmUser = null)
{
    if ((dmUser == null) || (dmUser == "") || (CurrentDomain == "nvi.local"))
        dmUser = "MERNIS\\************";

    Stopwatch sw = new Stopwatch();
    sw.Start();

    // Use Parallel.For to process the loop in parallel
    Parallel.For(0, belgeList.Length, i =>
    {
        var belgeData = belgeList[i];
        var anaBelgeTur = belgeData.AnaBelgeTur;

        if (anaBelgeTur == AnaBelgeTur.AksYeniBelge)
        {
            belgeList[i].BelgeVar = GdAksYeniQueries.AksBelgeKontrolu(belgeData, dmUser);
        }
        else if (anaBelgeTur == AnaBelgeTur.TckkYeniBelge)
        {
            belgeList[i].BelgeVar = GdTckkYeniQueries.TckkBelgeKontrolu(belgeData, dmUser);
        }
        //else if (anaBelgeTur == AnaBelgeTur.MernisBelge)
        //{
        //    belgeList[i].BelgeVar = GdMernisQueries.MernisBelgeKontrolu(belgeData, dmUser);
        //}
    });

    DtResult result = new DtResult { ResultState = DtResultState.Ok };
    result.BelgeKontrolListesi = belgeList;
    sw.Stop();
    var test = sw.ElapsedMilliseconds;
    return result;
}

如何提高 for 循环性能？

How can I improve the for loop performance?

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