for/foreach/linq执行效率测试
测试代码
private static void Test1(int count)
{
int s;
List<int> list = new List<int>();
for (int i = 0; i < 10000; i++)
{
list.Add(i);
}
Console.WriteLine("这是测试for/linq/foreach效率开始");
DateTime d1 = DateTime.Now;
for (int i = 0; i < count; i++)
{
var roleQuery = from r in list
where r == 3500
select r;
foreach (var role in roleQuery)
{
s = role;
}
Console.WriteLine("测试Linq第" + i +"次");
}
DateTime d2 = DateTime.Now;
DateTime d3 = DateTime.Now;
for (int c = 0; c < count; c++)
{
foreach (int role in list)
{
if (role == 350)
{
s = role;
}
}
Console.WriteLine("测试foreach第" + c + "次");
}
DateTime d4 = DateTime.Now;
DateTime d5 = DateTime.Now;
for (int c = 0; c < count; c++)
{
for (int i = 0; i < list.Count; i++)
{
if (list[i] == 350)
{
s = list[i];
}
}
Console.WriteLine("测试for第" + c + "次");
}
DateTime d6 = DateTime.Now;
DateTime d7 = DateTime.Now;
for (int c = 0; c < count; c++)
{
int i=0;
while ( i<list.Count)
{
if (list[i] == 350)
{
s = list[i];
}
i++;
}
Console.WriteLine("测试while第" + c + "次");
}
DateTime d8 = DateTime.Now;
Console.WriteLine("linq测试时长为：" + (d2 - d1).ToString());
Console.WriteLine("foreach测试时长为：" + (d4 - d3).ToString());
Console.WriteLine("for测试时长为：" + (d6 - d5).ToString());
Console.WriteLine("while测试时长为：" + (d8 - d7).ToString());
Console.Read();
} 调用代码
static void Main(string[] args)
{
//NewMethod();
int count = 100000000;
Test1(count / 1000); //太大了时间太长
//Test2(count);
} 执行结果
