How to create one string from list of String?

Question

Possible Duplicate:
Concat all strings inside a List<string> using LINQ

I am using C# 4.0, where I have a list non-null of string objects.

IList<String> Errors

What I want to do is to create a single string which has all list elements appended, one after another, with a new line character.

public String  ErrorMessage
{
    get { return Errors.SomeMethodHere(); }
}

One way I could think of is to loop on list of string. Is there any better way or in built System.String or LINQ method which I can use for this?

I think the best way is probably to loop through like you said — annonymously, Dec 02 '11 at 07:59
http://stackoverflow.com/questions/559415/concat-all-strings-inside-a-liststring-using-linq — Piotr Auguscik, Dec 02 '11 at 08:00
There is nothing wrong with the question. Probably, you wouldn't have asked it here since the solution is very simple. — Zaldy Baguinon, Dec 02 '11 at 08:12
This can be simple for someone, but I have never used this hence asked about that. Does simple solution mean down votes? — Maheep, Dec 02 '11 at 08:19
by that logic http://stackoverflow.com/users/22656/jon-skeet should down vote every question he answers. — Maheep, Dec 02 '11 at 08:20
@Zaldy Baguinon There are no simple questions. The very fact that it is a question means that it needs an answer and hence has been asked. A question that you find difficult might be simple to others. raison d'etre for stackoverflow is not classifying questions easy or hard but to answer questions. — P.K, Dec 02 '11 at 11:48
@P.K.: I thought that is the reason they down voted. I didn't down vote Maheeps question. I'm still new here perhaps some members think that way. — Zaldy Baguinon, Dec 05 '11 at 08:26

score 5 · Answer 1 · answered Dec 02 '11 at 07:59

5

String.Join(Environment.NewLine, Errors.ToArray());

answered Dec 02 '11 at 07:59

fixagon

5,506
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In .NET 4 you don't need the `ToArray`: [`String.Join`](http://msdn.microsoft.com/en-us/library/dd783876.aspx) has overloads that take `IEnumerable` for the second parameter. – Richard Dec 02 '11 at 08:08
Not necessary to use `.ToArray()`, .Join method also allow IList type data. – Elias Hossain Dec 02 '11 at 08:10
there are still some environments which use 3.5 (even 2.0 imagine!) --> no overload for IList – fixagon Dec 02 '11 at 08:14

score 2 · Accepted Answer · answered Dec 02 '11 at 07:59

2

Try String.Join(Environment.NewLine, Errors.ToArray()) (for .NET 4 and up you don't need the ToArray)

More Info: http://msdn.microsoft.com/en-us/library/57a79xd0.aspx

answered Dec 02 '11 at 07:59

Botz3000

39,020
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score 1 · Answer 3 · answered Dec 02 '11 at 08:09

1

public String ErrorMessage
{
    get 
    { 
        //Use your appropriate separator instead of ','
        return string.Join(",", Errors); 
        //return string.Join("", Errors); // Just concatenating all message 
    }
}

answered Dec 02 '11 at 08:09

Elias Hossain

4,410
1
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score 0 · Answer 4 · answered Dec 02 '11 at 08:03

0

Errors.Aggregate((left, right) => string.Format(@"{0}\n{1}", left, right));

answered Dec 02 '11 at 08:03

Harps

640
8
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Hiren Visavadiya · Answer 5 · 2011-12-02T09:10:50.997

 public static class MyExtensions
{
    public static string ErrorMessage(this IList<String> strList)
    {
        string retMessage = null;
        for (int i = 0; i < strList.Count; i++)
        {
            retMessage += strList[i].ToString() + Environment.NewLine;
        }
        return retMessage;
    }

}

you can use the above code snippest to make an extended method to generate single string from list data.

How to create one string from list of String?

5 Answers5