Stringbuilder append form from multiple arrays

Question

I have a StringBuilder and I'm trying to append parameters from multiple lists like this:

var sb = new StringBuilder();
var list1 = new List<string>() { "a", "b", "c" }
var list2 = new List<string>() { "d", "e" }
sb.AppendFormat(" {0}, {1}, {2}, {3}, {4} ", list1, list2);

I get an exception :

Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

What I did to make it work is create a temporary list

var temp = new List<string>();
temp.AddRange(list1);
temp.AddRange(list2);
sb.AppendFormat(" {0}, {1} ,{2}  ,{3}  ,{4} ", new List().Add);

Is there a more elegant way to do this ?

Yacoub Massad · Accepted Answer · 2016-06-28 20:25:41Z

8

You can do something as simple as this:

var result = string.Join(",", list1.Concat(list2));

You can append this to the string builder like this:

sb.Append(result);

answered Jun 28, 2016 at 20:25

Yacoub Massad

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Botond Botos · Accepted Answer · 2016-06-28 20:25:04Z

0

Try this one:

var sb = new StringBuilder();
var list1 = new List<string>() {"a", "b", "c"};
var list2 = new List<string>() {"d", "e"};
sb.AppendFormat(" {0}, {1}, {2}, {3}, {4} ", list1.Concat(list2).ToArray());
Console.WriteLine(sb.ToString());

answered Jun 28, 2016 at 20:25

Botond Botos

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