It is possible update List (type of class) only part of class?

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Hi
I have a List. List is a type class (MyClass). MyClass have same attribute (e.g. Name and Description - both type of string).
I fill List (Name and Description). Later I want update only Description. This Description I have in List (type of string).
It is possible update List without FOREACH (without need fill both attributes)?
Both List have same size (aaaa and NewDecsr).

C#

class MyClass
{
    public string Name { get; set; }
    public string Descr { get; set; }
}

C#

List<myclass> aaaa = new List<myclass>();
....

C#

List<string> NewDescr = new List<string>();
....

Something like this?

C#

aaaa[].Descr = NewDesc;

Thank you

Posted 2-Jul-13 20:21pm

smoula99

Updated 2-Jul-13 20:33pm

StM0n

v2

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StM0n 3-Jul-13 2:59am

Which framework-version?

smoula99 4-Jul-13 0:18am

.NET 3,5

2 solutions

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thanh_bkhn · Accepted Answer · 2013-07-02T20:30:00

Solution 1

Is something like this?

C#

for (int i = 0; i< aaaa.Count; i++)
{
    aaaa[i].Descr = NewDescr[i].Descr;
}

Posted 2-Jul-13 20:30pm

thanh_bkhn

Comments

StM0n 3-Jul-13 2:59am

Plain and simple :) have a five

smoula99 3-Jul-13 3:56am

yes, thanks
but I need use for (or foreach)

maybe I will have 50000 item of list
then will it slowly?

thanh_bkhn 3-Jul-13 4:06am

I think 50,000 item will not be a problem.

smoula99 3-Jul-13 4:20am

ok, thank you (i thought for solution will be using LINQ)
i use solution with for loop

StM0n · Accepted Answer · 2013-07-03T19:28:00

Solution 2

Just fiddling around, so no need to vote

C#

var toSkip = 0;

aaaa.ForEach(simpleClass => {
    simpleClass.Title = NewDescr.Skip(toSkip++).First();
});

just curios, could it be achieved otherwise :)

Posted 3-Jul-13 19:28pm

StM0n

Comments

smoula99 4-Jul-13 8:15am

yes, it is what I want to find

thank you

smoula99 9-Jul-13 3:25am

How Can I transfer List (type of string) - created and filled to List (type of class - where I want fill only 1 part of class, type of string) without using cycle FOR

ZItems.ForEach(x => new Item().ItemName = x) here I would like use ToList(), but it not possible
ZItems.ForEach(x => List2.Add(new Item().ItemName = x)) this indicate error

StM0n 10-Jul-13 1:33am

ZItems.ForEach(title => { List2.Add(new MyClass() { Title = title }); });

smoula99 10-Jul-13 2:09am

you are best man for create this effective part of code
can you give me link where I can read (learn) about effective using this programing
thanks you

StM0n 10-Jul-13 2:42am

good start for lambdas -> http://www.codeproject.com/Articles/507985/Way-to-Lambda