C # Excel NPOI operations,

C # Excel NPOI operations,

Recently, I want to develop a C # Excel tool, but after installing the Office, there are various component conflicts.

Later I found NPOI and thought it was very useful.

Here we will share with you,

Official Website: http://npoi.codeplex.com/downloads/get/872547

The following website has a tutorial: http://www.cnblogs.com/atao/archive/2009/11/15/1603528.html

Errors may be reported in some of the tutorials. The official website prevails.

How to arrange the number of C in A combination?

A32 is an arrangement. C32 is a combination.
For example, A32 is 3 multiplied by 2 to 6.
A 6 3 is 6*5*4
That is, starting from A large number, multiply the number next to it to indicate the number of numbers. A 7 2 equals 7*6*2, and there are two numbers. A 5 2 = 5*4.
Then C 3 2 is divided by A number. For example, C 3 2 is A 3 2 and then divided by A 22.
C 5 3 is A 5 3 divided by A 3 3
Are you quite clear about it?

How to arrange the number of C in A combination?

A32 is an arrangement. C32 is a combination.
For example, A32 is 3 multiplied by 2 to 6.
A 6 3 is 6*5*4
That is, starting from A large number, multiply the number next to it to indicate the number of numbers. A 7 2 equals 7*6*2, and there are two numbers. A 5 2 = 5*4.
Then C 3 2 is divided by A number. For example, C 3 2 is A 3 2 and then divided by A 22.
C 5 3 is A 5 3 divided by A 3 3
Are you quite clear about it?