how to extract substring from a string until finds a comma c# asp.net

Question

Hi,

I'm building a page and would like to know how to extract substring from a string until finds a comma in asp.net c#. Can someone help please?

Thanks,

Alina

Answer 1

myString = myString.Substring(0,myString.IndexOf(','));

Answer 2

string NoComma = "";
string example = "text before first comma, more stuff and another comma, there";
string result = example.IndexOf(',') == 0 ? NoComma  : example.Split(',')[0];

Answer 3

substring = str.Split(',')[0];

If str doesn't contain any commas, substring will be the same as str.

EDIT: as with most things, performance of this will vary for edge cases. If there are lots and lots of commas, this will create lots of String instances on the heap that won't be used. If it is a 5000 character string with a comma near the start, the IndexOf+Substring method will perform much better. However, for reasonably small strings this method will work fine.

Answer 4

You can use IndexOf() to find out where is the comma, and then extract the substring. If you are sure it will always have the comma you can skip the check.

        string a = "asdkjafjksdlfm,dsklfmdkslfmdkslmfksd";
        int comma = a.IndexOf(',');
        string b = a;
        if (comma != -1)
        {
            b = a.Substring(0, comma);
        }
        Console.WriteLine(b);

Answer 5

Alina, based on what you wrote above, then Split will work for you.

string[] a = comment.Split(',');

Given your example string, then a[0] = "aaa", a[1] = "bbbbb", a[2] = "cccc", and a[3] = "dddd"

Answer 6

var firstPart = str.Split(',', 2)[0]

Second parameter tells maximum number of parts. Specifying 2 ensures performance is fine even if there are lots and lots of commas.