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Make QR Code in Visual C#.NET is overloaded to allow you to pass in a lambda, just as you operator can when you use the
is overloaded to allow you to pass in a lambda, just as you operator can when you use the
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6: Quer y Operators
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Last and LastOrDefault You can use the operator to retrieve the last item from a sequence operator also work for Here is a call to the All the features of the operator that returns the name from the list:
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You can pass in a predicate to lter a list:
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This returns the value Claudius If you wrote a query that returned nothing, you would throw an excep/ block: tion, which you could capture in a
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You can call
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to sidestep this problem:
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Because this query returns zero elements, returns the for a reference type such as In the default value of statement, the conditional operator is used to determine whether the query returned an instance of
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Element Operators
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Single The operator returns one, and only one, element from a sequence If your sequence contains only one element, you can use the operator with zero parameters, as shown here:
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The point is that forces execution of the query If we did not call , the return value would be an enumeration with one element By , we get the result of the query without having to explicitly calling enumerate the list with on a sequence that contains more than It is a runtime error to call one element:
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If you have multiple elements in your sequence, you may write a simple predicate that acts as a lter to return only the element you want Your lambda must return only one element, or you receive an at runtime
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6: Quer y Operators
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ElementAt Here is how to pull Claudius name from the list:
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Element Operators and Composition I have been showing the Element operators in the context of a query expression, but you can use them directly on any type that supports :
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These queries produce the following output:
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Or you can use them on the results of a query:
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The query expression found at the beginning of the method retrieves the list of Julio-Claudian emperors from our collection:
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Element Operators
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It then uses The operator to pull the rst two items: Augustus and Caligula to pull the name Augustus from the list to pull the name Tiberius from the list to pull our friend Claudius name from the list
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This ability to reuse the results of a query is a form of composition, as described in 3, The Essence of LINQ
DefaultIfEmpty Use the operator if you want to be sure that a result sequence has at least one element Consider this query:
It returns an empty list with zero elements This query, on the other hand, returns a list with one element that is set to null:
The output from these lines of code looks like this:
If a query returns a normal result sequence with one or more elements, does nothing It is as if you never called it Here a call to is an example:
6: Quer y Operators
This query returns the names of our ve male emperors You can specify a default value so that the single item in the list returned contains a valid class rather than null: by
This code uses our following:
implementation in the
class to return the
Set Operators
Continuing our tour of the LINQ operators, we can now turn our attention to the Set operators, which are shown in Table 65 They allow you to perform set operations on various sequences You can apply the Set operators All the set operators to any two sequences that implement operator is also discussed in this section are deferred The
Table 65 Set Operators Description
Operator Name
Shows the distinct elements in a sequence Shows the unique items obtained by combining two sets Shows the elements that two sets have in common
Set Operators
Operator Name Description
Shows all the members of one set except those in a second set Concatenates two sequences * Tests if two sequences are equal
Union The operator shows the unique items from two lists, as shown in Listing 63 Here we have two lists one containing the numbers 1, 2, and 3, and the other 3, 4, 5, and 6 The union of these two lists is the numbers 1, 2, 3, 4, 5, and 6