It's a simple question; I am a newbie in C#, how can I perform the following
- I want to convert an array of integers to a comma-separated string.
I have
int[] arr = new int[5] {1,2,3,4,5};
I want to convert it to one string
string => "1,2,3,4,5"
Add a comment
|
5 Answers
var result = string.Join(",", arr);
This uses the following overload of string.Join:
public static string Join<T>(string separator, IEnumerable<T> values);
4 Comments
leppie
You do not need to pass the explicit generic argument in this case. It will be inferred.
TPAKTOPA
Pre .NET 4 string.Join(",", Array.ConvertAll(arr, i => i.ToString()))
Kory
Is there a simple way to do the reverse of this? Take the string and put it into an array?
Cheng Chen
@Kory: Using String.Split method, see msdn.microsoft.com/en-us/library/…
.NET 4
string.Join(",", arr)
.NET earlier
string.Join(",", Array.ConvertAll(arr, x => x.ToString()))
2 Comments
Luis Tellez
just realized i couldn't use the .net 4 version and i didn't understood why i was having an error until i saw your answer , thanks.
Prasanth G
I am using .NET 4.5. I tried to concat the comma separated numbers with a string. I got an error saying "cannot convert string[] to char". So the earlier version worked flawlessly.
int[] arr = new int[5] {1,2,3,4,5};
You can use Linq for it
String arrTostr = arr.Select(a => a.ToString()).Aggregate((i, j) => i + "," + j);
Comments
You can have a pair of extension methods to make this task easier:
public static string ToDelimitedString<T>(this IEnumerable<T> lst, string separator = ", ")
{
return lst.ToDelimitedString(p => p, separator);
}
public static string ToDelimitedString<S, T>(this IEnumerable<S> lst, Func<S, T> selector,
string separator = ", ")
{
return string.Join(separator, lst.Select(selector));
}
So now just:
new int[] { 1, 2, 3, 4, 5 }.ToDelimitedString();
Comments
Use LINQ Aggregate method to convert array of integers to a comma separated string
var intArray = new []{1,2,3,4};
string concatedString = intArray.Aggregate((a, b) =>Convert.ToString(a) + "," +Convert.ToString( b));
Response.Write(concatedString);
output will be
1,2,3,4
This is one of the solution you can use if you have not .net 4 installed.
2 Comments
Simon Belanger
It performs poorly due to the string concatenation, though
sushil pandey
yes it will perform poorly but before .net 4.0 String.join only take string array as parameter.Thus in that case we also need to convert in string .we can use ToString it perform better but there is problem of null exception