can someone tells me what is .First ?

Tangara G

10y903.NET

Hi experts,

I have this rather stupid question yet I duno the answer. Hope someone can let me know the answer :

Can I know why do we need to put .First ?

6 Replies

Know the answer? Post it — somebody with the same question will find it here.

Tangara G10y ago
Thank you Tapan.
This LINQ is really mysterious....
Tapan Patel10y ago
Without LINQ,
foreach(var item in db.Accounts)
{
   if(item.userName==userName && item.type==type)
   {
   account=item;
   break;
   }
}
if(account==null)return null;
else   return account;
Tangara G10y ago
Tks Mihun and Vasu for clarifying my doubt.
I had no idea that statement I had doubt is a LINQ....
Wonder if it is possible not to use LINQ and we can get the same result also ?
Vasu Gadhiya10y ago
as Midhun T Tp Says
first() return first element from result of expression
but if you dont want to raise Exception than use .FirstOrDefault() function instead of using .First()
----------------------------------------------
try
{
account = db.Accounts.where(e => e.userName == userName && e.type == type).FirstOrDefault();
if(account == null)
{
// consider that your account is null
}
else
{
// your account object have some data
}
}
catch
{
}
Midhun Tp10y ago
Hi Karen,
First() returns the first element from the result of expression. If there is no record corresponding to the expression, First() method will throw an exception.
Just go through below links for more details -
https://msdn.microsoft.com/en-us/library/bb291976(v=vs.110).aspx
http://www.c-sharpcorner.com/blogs/difference-between-first-and-firstordefault-in-linq1
Mark Tabor10y ago
I think google can assists you batter its not an issue to define some thing :) happy Googling