C# 0 The Complete Reference

int

 called 

nums

 is declared. All arrays in C# are implicitly convertible 

to

IEnumerable

. This makes any C# array usable as a LINQ data source.

Next, a query is declared that retrieves those elements in 

nums

 that are positive. It is 

shown here:

var posNums = from n in nums

              where n > 0

              select n;

The variable 

posNums

 is called the 

query variable.

 It refers to the set of rules defined by the 

query. Notice it uses 

var

 to implicitly declare 

posNums

. As you know, this makes 

posNums

an implicitly typed variable. In queries, it is often convenient to use implicitly typed 

variables, although you can also explicitly declare the type (which must be some form 

of