大橙子网站建设,新征程启航
为企业提供网站建设、域名注册、服务器等服务
我们通过一个方法判断 (1.str == "" 2.str == String.Empty 3.str.Length == 0)
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static void Main()
{
string str = "csdn";
System.Diagnostics.Stopwatch st = new System.Diagnostics.Stopwatch();
st.Start();
for (int i = 0; i < 100000000; i++)
{
if (str == "")
{ }
}
st.Stop();
Console.WriteLine("str == '' : " + st.ElapsedMilliseconds);
st = new System.Diagnostics.Stopwatch();
st.Start();
for (int i = 0; i < 100000000; i++)
{
if (str == String.Empty)
{ }
}
st.Stop();
Console.WriteLine("str == String.Empty : " + st.ElapsedMilliseconds);
st = new System.Diagnostics.Stopwatch();
st.Start();
for (int i = 0; i < 100000000; i++)
{
if (str.Length == 0)
{ }
}
st.Stop();
Console.WriteLine("str.Length == 0 : " + st.ElapsedMilliseconds);
Console.ReadKey();
}
F5 用行
str == '': 1951 (微妙为单位)
str =='': 1867
str =='': 522