我用两种方法填充了2个dataGridView:
1)Lambda表达式:
protected void FillLamdaMethod()
{
Stopwatch sw = Stopwatch.StartNew();
using (eCommerceContext ctx = new eCommerceContext())
{
List<table_bilgisayar> listBilgisayar = new List<table_bilgisayar>();
listBilgisayar = ctx.table_bilgisayar.ToList();
dataGridViewLamda.DataSource = listBilgisayar;//qry.AsEnumerable();
}
sw.Stop();
lblLamdaResult.Text = String.Format("Time used (float): {0} ms",sw.Elapsed.TotalMilliseconds)+Environment.NewLine;
lblLamdaResult.Text+=String.Format("Time used (rounded): {0} ms", sw.ElapsedMilliseconds);
}
2)Linq方法:
protected void FillClassicMethod()
{
Stopwatch sw = Stopwatch.StartNew();
using (eCommerceContext ctx = new eCommerceContext())
{
List<table_bilgisayar> listBilgisayar = new List<table_bilgisayar>();
listBilgisayar =(from q in ctx.table_bilgisayar select q).ToList();
dataGridViewClasicLinq.DataSource = listBilgisayar;//(from q in ctx.table_bilgisayar select q.model).ToList();
}
sw.Stop();
lblClassicResult.Text = String.Format("Time used (float): {0} ms", sw.Elapsed.TotalMilliseconds)+Environment.NewLine;
lblClassicResult.Text += String.Format("Time used (rounded): {0} ms", sw.ElapsedMilliseconds);
}
我有 2 个重要问题
1)这种秒表方法是正确的或足够的,还是有更好的方法来计算性能?
2)这次起来;我知道 lambda 表达式比经典 linq 更快(来自表中的 x 等......)但测试结果令人惊讶:
1)Lambda 方法:867 毫秒
2)Linq 方法:39 毫秒这个结果是正确的吗?我想它一定是相反的......
还可以单击 fillButton 来调用此方法。性能结果愚蠢地改变。我认为这很疯狂。867 ms 第二次点击结果 56 ms 第三次点击 45 ms....