i have a list of string
Emails = new List<string>() { "[email protected]", "[email protected]" }
now i want to pass string.empty to first value of list
something like
policy.Emails = new List<string>(){string.Empty};
how to put a loop for e.g. for each value of list do something.
you can directly set the first element as string.Empty:
policy.Emails[0]=string.Empty;
You can use indexof function for finding a string in the list as below,
List<string> strList = new List<string>() { "[email protected]", "[email protected]" };
int fIndex = strList.IndexOf("[email protected]");
if(fIndex != -1)
strList[fIndex] = string.Empty;
Or if you want to replace first item with string.Empty then as dasblinkenlight mentioned you can do using the index directly,
strList[0] = string.Empty
Hope it helps.
You can prepend string.Empty to an existing list with concat:
var emails = new List<string> {"[email protected]", "[email protected]"};
policy.Emails = new[] {string.Empty}.Concat(emails).ToList();
Now policy.Emails looks like this:
{"", "[email protected]", "[email protected]"}
If you would like to replace the first item, use Skip(1) before concatenating:
policy.Emails = new[] {string.Empty}.Concat(emails.Skip(1)).ToList();
To generalize, replacing the initial n values with empty strings would look like this:
policy.Emails = Enumerable.Repeat(string.Empty, 1).Concat(emails.Skip(n)).ToList();
Note: It goes without saying that if you do not mind modifying the list in place, the simplest solution is to do
emails[0] = string.Empty;
"[email protected]" because it is the first item on the list?If you want to add an empty string at the beginning of a list you could do:
emails.Insert(0, string.Empty);
