小编Gra*_*ian的帖子

我试图加快一个经常使用的查询.使用a CompiledQuery似乎是答案.但是当我尝试编译版本时,编译版和非编译版之间的性能没有差异.

有人可以告诉我为什么使用Queries.FindTradeByTradeTagCompiled不比使用更快Queries.FindTradeByTradeTag？

static class Queries
{
    // Pre-compiled query, as per http://msdn.microsoft.com/en-us/library/bb896297
    private static readonly Func<MyEntities, int, IQueryable<Trade>> mCompiledFindTradeQuery =
        CompiledQuery.Compile<MyEntities, int, IQueryable<Trade>>(
            (entities, tag) => from trade in entities.TradeSet
                               where trade.trade_tag == tag
                               select trade);

    public static Trade FindTradeByTradeTagCompiled(MyEntities entities, int tag)
    {
        IQueryable<Trade> tradeQuery = mCompiledFindTradeQuery(entities, tag);

        return tradeQuery.FirstOrDefault();
    }

    public static Trade FindTradeByTradeTag(MyEntities entities, int tag)
    {
        IQueryable<Trade> tradeQuery = from trade in entities.TradeSet
                                       where trade.trade_tag == tag
                                       select trade;

        return …