IsNullOrEmpty and S = = NULL | | S.length = 0 which is fast

Describes the comparison between a method of a string and a property to determine whether a string variable is empty, a string variable ' s ', and the following expression is faster?

1. String.IsNullOrEmpty (s)

2. S = = NULL | | s.length = 0

If you guess the second one, then you're right. It will be 15% faster than the String.IsNullOrEmpty method, but this is measured in one out of 10,000 seconds!

Here's a simple example to compare 2 different ways:

Using System;

Namespace Stringnullempty

{

Class Program

{

static void Main (string[] args)

{

Long loop = 100000000;

string s = null;

Long option = 0;

Long empties1 = 0;

Long empties2 = 0;

DateTime time1 = DateTime.Now;

for (long i = 0; I < loop; i++)

{

option = i% 4;

Switch (option)

{

Case 0:

s = null;

Break

Case 1:

s = String.Empty;

Break

Case 2:

s = "H";

Break

Case 3:

s = "HI";

Break

}

if (String.IsNullOrEmpty (s))

empties1++;

}

DateTime time2 = DateTime.Now;

for (long i = 0; I < loop; i++)

{

option = i% 4;

Switch (option)

{

Case 0:

s = null;

Break

Case 1:

s = String.Empty;

Break

Case 2:

s = "H";

Break

Case 3:

s = "HI";

Break

}

if (s = = NULL | | s.length = 0)

empties2++;

}

DateTime Time3 = DateTime.Now;

TimeSpan span1 = time2. Subtract (time1);

TimeSpan span2 = Time3. Subtract (time2);

Console.WriteLine ("(String.IsNullOrEmpty (s)): time={0} empties={1}",

Span1, empties1);

Console.WriteLine ("(s = = NULL | | S.length = = 0): time={0} empties={1} ",

Span2, Empties2);

Console.ReadLine ();

}

}

}

Here is the result:

(String.IsNullOrEmpty (s)): time=00:00:06.8437500 empties=50000000

(s = = NULL | | s.length = 0): time=00:00:05.9218750 empties=50000000

---------------------------------------------------------------------------------------------

It can be seen that string.isnullorempty although slow to run, but it is easy to read, Microsoft's design is still very humane ~