My sample data coloumn, which come from an CSV file is
|----Category------------|
SHOES
SHOES~SHOCKS
SHOES~SHOCKS~ULTRA SOCKS
I would love to split the specific column and get the distinct values in a list like
SHOES
SHOCKS
ULTRA SOCKS
I tried the following, but it does not work as expected.
var test = from c in products select c.Category.Split('~').Distinct().ToList();
It actually returns the following.
Any thoughts please? Thank you.
I would use SelectMany
to "flatten" the list before removing duplicates:
products.SelectMany(c => c.Category.Split('~'))
.Distinct()
您可以使用SelectMany
展平集合:
products.SelectMany(p => p.Category.Split('~')).Distinct().ToList();
You were close, you just needed to flatten out your collection to pull the individual items of each grouping via a SelectMany()
call :
// The SelectMany will map the results of each of your Split() calls
// into a single collection (instead of multiple)
var test = products.SelectMany(p => p.Category.Split('~'))
.Distinct()
.ToList();
You can see a complete working example demonstrated here and seen below :
// Example input
var input = new string[] { "SHOES","SHOES~SHOCKS","SHOES~SHOCKS~ULTRA SOCKS" };
// Get your results (yields ["SHOES","SHOCKS","ULTRA SOCKS"])
var output = input.SelectMany(p => p.Split('~'))
.Distinct()
.ToList();
通过使用SelectMany()
将此list of strings
列表list of strings
合并到一个列表中,然后向列表中添加另一个Distinct。
var test = from c in products select c.Category.Split('~').Distinct().ToList().SelectMany(x => x).Distinct().ToList();
Here's how you'd do it in query syntax.
var test = (from p in products
from item in p.Category.Split('~')
select item).Distinct().ToList();
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