How to convert List to List?

Question

My question is part of this problem:

I recieve a collection of id's from a form. I need to get the keys, convert them to string and pass it to the db.

 using (var db = new DbAmsecEntities())
 {
    cashsafelist = (from safe in db.Cashsafes
                    where safe.StoreId == (decimal)Convert.ToInt64(ddlLocationLists.SelectedValue)
                    select safe.CashsafeId).ToList();
    cashsafevalues = cashsafelist.Select(x => x.ToString).ToList();//getting error here
 }

Tried adding brackets to the `x.ToString()` call? For future reference, please try to detail the error you are getting and what attempts you have made to fix it; this makes the question better quality. — Adam Houldsworth, May 28 '14 at 08:37
What error are you getting? Based on what the problem actually is, the error message should be a pretty big clue. — Jon Egerton, May 28 '14 at 08:38
Why convert to Int64 and then cast to decimal, use Convert.ToDecimal instead — 3dd, May 28 '14 at 08:39

score 7 · Accepted Answer · answered May 28 '14 at 08:37

7

You need to use () in ToString

cashsafevalues = cashsafelist.Select(x => x.ToString()).ToList();

answered May 28 '14 at 08:37

Sajeetharan

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Or: cashsafelist.Select(ToString).ToList(); – Dennis_E May 28 '14 at 08:45
1

@Dennis_E: than won't compile since `ToString` is not static. – Tim Schmelter May 28 '14 at 08:46
@TimSchmelter being static has nothing to do with it. Can't you do that with an instance method??? On mono, I get the message it cannot infer the type, so that's why it fails. (I don't have access to a Windows machine right now, so I can't check if this is mono only). When you write a lambda like that, Resharper will hint to change it to a method group, because the x => x is redundant. – Dennis_E May 28 '14 at 09:16
@Dennis_E: you're right, whether it is `static` or not is not the only factor that matters. I must admit that i'm not sure how to get it to work with non-static methods but it must work somehow. That's why i've asked [this question](http://stackoverflow.com/questions/23908548/how-to-use-existing-method-instead-of-lambda-when-its-not-static) :) – Tim Schmelter May 28 '14 at 10:17

score 2 · Answer 2 · answered May 28 '14 at 08:40

2

You can also use List.ConvertAll which was available since 2.0.

cashsafevalues = cashsafelist.ConvertAll<string>(d => d.ToString());

It can be more efficient than ToList because the list will be initialized with the correct size.

answered May 28 '14 at 08:40

Tim Schmelter

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How to convert List to List?

2 Answers2

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