有“Sum”功能吗？

Question

I've got following code snippet:

> 1..10|%{$count=0}{$count+=$_}{$count}
55
> 1..10|Sum

The last line obviously shows an error since there is no "Sum" function. Is there a convenient way to sum items in PowerShell?

Answer 1

You can use the Measure-Object cmdlet :

PS > 1..10 | Measure-Object -Sum
Count    : 10
Average  : 
Sum      : 55
Maximum  : 
Minimum  : 
Property :     
PS > (1..10 | Measure-Object -Sum).Sum
55
PS >

Note that it also works with properties of objects:

PS > ('abc', 'def', 'ghi') | Measure-Object -Sum -Property Length
Count    : 3
Average  : 
Sum      : 9
Maximum  : 
Minimum  : 
Property : Length
PS > 

In the above example, we sum the lengths of the strings in the array by setting the -Property parameter to Length .