使用linq计算重复记录

Question

使用linq计算重复记录 .................................................. .................................................. ..............................................

Col1  col2
x       a
x       a
x       b
x       b
y       c
y       c
y       d
y       d
z       e
z       e
z       f

现在我想要数如下

x  a 2
x  b 2
y  c 2
y  d 2

in linq plese任何人协助我

Answer 1

table
.GroupBy(x=>new{x.col1,x.clo2})
.Select(x=>new{ x.key.col1,x.key.col2,x.Count(z=>z.col1)

Answer 2

var Result =
from t in table
group t by new
{
    t.col1,
    t.col2,
} into gt
select new
{
    col1 = gt.Key.col1,
    col2 = gt.Key.col2,
    count = gt.Count(),
};