Generic List

[shapper]

Hello,

How can I convert a Generic.List(Of String) to a single string where
all elements are separated by a comma?

My string would become:

"item1,item2,item3"

Thanks,

Miguel

 

[Grant Merwitz]

C# example

List<string> Strlist = new List<string>();

StrList.Add("1");
StrList.Add("2");
StrList.Add("3");

string SingleString = "";
foreach(string s in Strlist.ToArray())
SingleString += s + ",";

You can then either remove the last ","
or in the loop work out which is the first item or last

 

[Guest]

Howdy,

I'd would not recommend this approach as is inefficient (first copy to
array, and then string concatenation). This is much faster:

public static string ConcatList<T>(
System.Collections.Generic.IList<T> list, char separator)
{
System.Text.StringBuilder text =
new System.Text.StringBuilder();

for (int i = 0; i < list.Count; i++)
{
text.Append(list);
text.Append(separator);
}

if (text.Length > 0)
text.Length -= 1;

return text.ToString();
}

 

[Grant Merwitz]

thanks for a more efficient method.

I'll be sure to use that in future

Howdy,

I'd would not recommend this approach as is inefficient (first copy to
array, and then string concatenation). This is much faster:

public static string ConcatList<T>(
System.Collections.Generic.IList<T> list, char separator)
{
System.Text.StringBuilder text =
new System.Text.StringBuilder();

for (int i = 0; i < list.Count; i++)
{
text.Append(list);
text.Append(separator);
}

if (text.Length > 0)
text.Length -= 1;

return text.ToString();
}
--
Milosz

C# example

List<string> Strlist = new List<string>();

StrList.Add("1");
StrList.Add("2");
StrList.Add("3");

string SingleString = "";
foreach(string s in Strlist.ToArray())
SingleString += s + ",";

You can then either remove the last ","
or in the loop work out which is the first item or last