目前，本扩展只支持.NET4及以上版本的项目，低版本的暂时不支持，请见谅。
引用NPOI.CSS.dll
using NPOI.CSS;
cell.CSS("color:red;font-weight:bold;font-size:11;font-name:宋体;border-type:thin;")
注意只能有一个值
none 无下划线
single 单下划线
double 双下划线
single_accounting 会计用单下划线
double_accounting 会计用双下划线 ## 字标 font-superscript
none 无
sub 下标
super 上标
general
left
center
right
fill
justify
center_selection
distributed
top
center
bottom
justify
distributed
none
thin
medium
dashed
hair
thick
double
dotted
medium_dashed
dash_dot
medium_dash_dot
dash_dot_dot
medium_dash_dot_dot
slanted_dash_dot
true
false
true
false
参考NPOI官方文档中格式化字符串的设定要求
black
white
red
bright_green
blue
yellow
pink
turquoise
dark_red
green
dark_blue
dark_yellow
violet
teal
grey_25_percent
grey_50_percent
cornflower_blue
maroon
lemon_chiffon
orchid
coral
royal_blue
light_cornflower_blue
sky_blue
light_turquoise
light_green
light_yellow
pale_blue
rose
lavender
tan
light_blue
aqua
lime
gold
light_orange
orange
blue_grey
grey_40_percent
dark_teal
sea_green
dark_green
olive_green
brown
plum
indigo
grey_80_percent
automatic
font-color
color
fc
font-weight
fw
font-name
fn
font-size
fs
font-italic
italic
i
font-underline
underline
u
font-strikeout
deleteline
d-line
strikeout
d
font-superscript
font-offset
superscript
fss
ss
background-color
bg-color
bg-c
bgc
text-align
align
vertical-align
v-align
data-format
format
项目主页：http://www.open-open.com/lib/view/home/1437535720662
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