How to Filtering Arraylist using LINQ?

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We have arraylist like below:

ArrayList list = new ArrayList();
list[0]=""mdmf4": {"min_price": 39.72,"trans": "Manual"}";
list[1]=""mdmf4": {"min_price": 40.72,"trans": "Manual"}";
list[2]=""mdmf5": {"min_price": 39.56,"trans": "Manual"}";
list[3]=""mdmf5": {"min_price": 22.44,"trans": "Manual"}";
list[4]=""maaf4": {"min_price": 71.82,"trans": "Manual"}";
list[5]=""maaf4": {"min_price": 39.00,"trans": "Manual"}";

I want to filter aaraylist with minimum price and result looks like :

list[0]=""mdmf4": {"min_price": 39.72,"trans": "Manual"}";
list[1]=""mdmf5": {"min_price": 22.44,"trans": "Manual"}";
list[2]=""maaf4": {"min_price": 39.00,"trans": "Manual"}";

How to do without using Loop? Is it possible with LINQ?

Posted 23-Aug-15 21:00pm

Harish Kumar Bansal

Updated 23-Aug-15 21:16pm

Maciej Los

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Maciej Los 24-Aug-15 3:16am

What have you tried? Where are you stuck?

Maciej Los 24-Aug-15 3:20am

At the first look, aAbove code won't compile...

DamithSL 24-Aug-15 3:46am

what is your filter condition?

F-ES Sitecore 24-Aug-15 4:19am

If you want to filter using Linq then don't use an ArrayList, use something that is strongly typed. Also as others have said, your code doesn't look valid, it seems like you're trying to store a list of anonymous types, but as I hinted at above, you should store concrete types in a List<T> or similar.

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Andy Lanng · Answer 1 · 2015-08-23T22:05:00

First: I cannot make much sense of your list. Is that supposed to be a JSON style object? if so then it is badly formed.
I will assume a POCO with id and value for this example.

You need a groupby followed by a min:

C#

var result = list
            .GroupBy(l=>l.id)
            .Select(g=>new {id=g.key,value = g.min(l=>l.value);

this will return an anon type with id and value. You can select a new defined POCO type if that's what you need.