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An Interesting Case
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Suppose we begin our series with a number that is not evenly divisible by 7, such as 8,000:
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Now we ask for all the values in this list that are evenly divisible by 11, using the query just shown The result is a list of numbers that
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6: Quer y Operators
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begins like this: , , , , If you divide any of these numbers by 7, you end up with a repeating set of decimal values:
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As I say, it s an interesting case
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SkipWhile The operator is very much like , except that it skips the items from the beginning of a list that don t meet a particular condition We don t want to use this operator with an in nite list, because it would never de ne a closing condition We can, however, use it with a method that could potentially generate a fairly long list:
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The sequence generated by this method runs in increments of 7 from 1001 to 1000, but it could easily be extended to range over all integers expressible and on a 64-bit system that is, the numbers between : Here is a query run against
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Partitioning Operators
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This code retrieves all the positive numbers from the list that are divisible by 11 The rst viewed elements in the result sequence look like this:
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Something about these operators tempts you to show how they can be used to manipulate numbers Nevertheless, it would probably be wise to nish this section with a query against string data:
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This query asks for all the female Romans from our list but asks that we skip those whose name begins with the letter A:
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In reading this section you may have sensed three things: Although you have seen only a few LINQ operators so far, it should be clear that, taken together, these operators form a complete language for querying data One senses the team s desire to be sure to include a way to express all the possible ways to query data Some of these operators can be useful for writing mathematical formulas or expressing mathematical ideas LINQ is quite at home working with in nite lists You might, for instance, use LINQ to query an in nite stream of data coming in over the Internet, a stream of bytes from a network, a sequence of numbers such as primes, and so on
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6: Quer y Operators
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Element Operators
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As shown in Table 64, there are nine Element operators Except for , which is deferred, their purpose is to force execution of a query and immediately return a single item from an enumeration Examples of using all of these operators are found in the ElementOperators sample program available on the book s web site
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Table 64 Element Operators Description
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Operator Name
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* * * * * * * *
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Retrieves the rst item from an enumeration Gets the rst element or a default value for the list type Retrieves the last item from an enumeration Gets the last item or a default value for the list type Returns the only element from a sequence that satis es a condition Returns a single element or a default value for the list type Retrieves an element at a speci ed offset in a list Retrieves an element at a speci ed offset or a default value Retrieves a default value if the list is empty or null
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The Element operators allow you to access individual items from a , none of these operators sequence With the exception of are deferred
First and FirstOrDefault The following query uses the a query:
operator to return the initial item from
Element Operators
When enumerated, this query returns Augustus operator: Here is another common way to call the
Pass a predicate to
to specify a lter:
If the sequence you are querying is empty, throws an If you think this probably will happen, call This operator returns the default value for the type of element in your sequence The default value for Reference types is null; for numeric Value types, it is 0 For instance, if you are working with a sequence of string, it returns null Because the lter in this query causes it to return a result sequence with operator throws an exception when zero elements, this call to the enumerated:
This query, however, does not throw an exception and returns null: