c# – 编译表达式树的性能

表达式编译树的性能比静态lambda调用慢5倍.我不确定这是否是表达式编译树可以预期的标准性能.非常感谢任何见解.

LambdaExpression();
List<Stock> stocks = new List<Stock>();
for (int ctr = 0; ctr <= 5000000; ctr++)
{
    Stock stk1 = new Stock() { Price = ctr,Symbol = "A",CloseDate = DateTime.Now,FaceValue = ctr } ;
    stocks.Add(stk1);
}
CompileTimeLamda(a);
DynamicLambda(a);


public static void LambdaExpression()
{
    ParameterExpression CS1 = Expression.Parameter(typeof(Stock),"d");

    var line1 = Expression.Equal(Expression.Property(CS1,typeof(Stock).GetProperty("Symbol")),Expression.Constant("MSFT",typeof(string)));
    var line2 = Expression.GreaterThan(Expression.Property(Expression.Property(CS1,typeof(Stock).GetProperty("CloseDate")),typeof(DateTime).GetProperty("Millisecond")),Expression.Constant(0,typeof(int)));
    var line3 = Expression.GreaterThan(Expression.Property(CS1,typeof(Stock).GetProperty("Price")),Expression.Constant((double)0,typeof(double)));
    var line4 = Expression.And(line1,line2);
    var line5 = Expression.OrElse(line4,line3);

    func = Expression.Lambda<Func<Stock,bool>>(line5,new ParameterExpression[] {  CS1 } ).Compile();
}


public static void DynamicLambda(List<Stock> stks)
{
    Stopwatch watch = new Stopwatch();
    watch.Start();
    foreach (var d in stks)
    {
        func(d);
    }
    watch.Stop();
    Console.WriteLine("Dynamic Lambda :" + watch.ElapsedMilliseconds);
}

public static void CompileTimeLamda(List<Stock> stks)
{
    Stopwatch watch = new Stopwatch();
    watch.Start();
    foreach (var d in stks)
    {
        if (d.Symbol == "MSFT" && d.CloseDate.Millisecond > 0 ||
                                  (d.Price) > 0) ;
    }
    watch.Stop();
    Console.WriteLine("Compile Time Lamda " +watch.ElapsedMilliseconds);
}