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How do i do this in one statement vs breaking up in two?
var newpeople= _rep.GetPeople().Where(p=>p.personID).Select(new KindoFPerson...id=p.id etc)
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While the LINQ methods always return a new collection, they don't create a new set of objects: Both the input collection (customers, in my example) and the output collection (validCustomers, in my previous example) are just sets of pointers to the same objects.
So performance-wise, there's no difference whatsoever between the two. Which one you should use is mostly personal preference, many people prefer lambda expressions because they're shorter and more concise, but personally I prefer the query syntax having worked extensively with SQL.
A lambda expression is a convenient way of defining an anonymous (unnamed) function that can be passed around as a variable or as a parameter to a method call. Many LINQ methods take a function (called a delegate) as a parameter.
All lambda expressions use the lambda operator =>, that can be read as “goes to” or “becomes”. The left side of the lambda operator specifies the input parameters and the right side holds an expression or a code block that works with the entry parameters.
var newpeople= _rep.GetPeople().Where(p=>p.personID)
.Select(p => new KindoFPerson...id=p.id etc)
Note the new "p =>".
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