Convert List<int> to delimited string list [duplicate]

Question

Possible Duplicate:
most elegant way to return a string from List<int>

I'm not sure the easiest way to do this. I simply want to add a ; between each value and spit it out as one string. I don't see that you can do this with ToString(). I'd have to loop through and create a stringbuilder and append & add a ";".

Billiot

sorry that is an List<int> not List<string> – Billiot

I need to convert a List<string> to a delmited string. So "123;343;222" – Billiot

@coffeeaddict: It's OK to edit your original question. That's better than hoping people will read all the details in the comments. – Camail

I think this is probably an exact duplicate of #1334572 – Diapositive

Except that there is now a better (.NET 4.0 only) answer. – Dulsea

Answer 1

UPDATED to use List<int> instead of List<string>

Use string.Join:

List<int> data = ..;
var result = string.Join(";", data); // (.NET 4.0+)
var result = string.Join(";", data.Select(x => x.ToString()).ToArray()); // (.NET 3.5)

Dulsea

sorry I have changed the question, my mistake – Billiot

I've updated the answer to match. – Dulsea

+1 for .Net 4 enumerable string.Join – Antwanantwerp

interesting. I had also tried myIntList.ToString().ToArray() but must be doing something wrong – Billiot

var result = data.ConvertAll(c=>c.ToString()); where data is List<int> – Accoucheur

Answer 2

string.Join(";", myList.ToArray());

Arthurarthurian

Answer 3

Just use the join

string combinedString = String.Join(";", arrayName);

Currie

Answer 4

List<String> list = new List<String>() { "A", "B", "C", "D", "E" };
String joindString1 = String.Join(";", list.ToArray());
String joindString2 = list.Aggregate((s1, s2) => s1 + ";" + s2);

Spherical

Answer 5

You can also use Enumerable.Aggregate which can give extra flexibility.

var data = new List<int> { 1,2,3 };
var sb = new StringBuilder(100);

// do some other stuff with sb

sb = data.Aggregate(sb, (b, d) => b.Append(d).Append(';'));
if( data.Count > 0 ) sb.Length--;

//do some more stuff with sb

var str = sb.ToString();

Agnusago