The rounding method in C # and the method for getting the timestamp (unixtime) in C #

If you ask C #ProgramClerk, how is the rounding method written. Many people can easily writeMath. Round () method. But I don't know what's sad!

Write the following calculation results:

Math. Round (0.5)
Math. Round (1.5)

Some may write, and the calculation result is1And2.

That's a big mistake! It turns out that the results of these two expressions are0And2! This is where many program bugs are located.

Careful programmers can take a look atMathDescription of the. Round (decimal) method. The return value is described as follows:

Return Value

Type: system. Decimal
The integer closest to parameter D.If the fractional part of D is in the middle of two integers, one of which is an even number and the other is an odd number, the return value is an even number.

ThisThe preceding two expressions return values 0 and 2, respectively. It also proves that the simple math. Round (decimal) method cannot implement the rounding function!

. Math. round () also provides some other overload methods, one of which is math. round (decimal, midpointrounding) method. This method can be used to rounding decimal places. The method is as follows:

Math. Round (decimal, midpointrounding. awayfromzero)

Success! Let our program say goodbye to bugs!

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. Net does not encapsulate the method for obtaining the timestamp (unixtime, relative to the number of milliseconds in the early morning of January 1, January 1, 1970. Therefore, I have written the following method for implementation.

Datetime starttime = timezone. currenttimezone. tolocaltime (NewSystem. datetime (1970,1,1,0,0,0,0));

Datetime nowtime = datetime. now;

LongUnixtime = (Long) Math. Round (nowtime-starttime). totalmilliseconds, midpointrounding. awayfromzero );