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loop pulls out the following data:
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Our code prints the , which in this case is a method name, followed by the names of the parameters of each overload These names are retrieved eld of the object For instance, from the is the name of the rst operator It has three overloads, and the rst and overload takes two parameters called
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Group-by Clauses and the into Keyword clauses can also be used in the middle lines of a properly formatted query expression In this scenario, you always combine clauses with the keyword Listing 51 shows an example
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Listing 51 This Query Is Found in the GroupByOperators Program That Accompanies This
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5: Writing Quer y Expre ssions
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If you over the computation returned by this deferred query, you will nd that the rst few items in the result sequence look like this:
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This query shows examples of using , , , - , and clauses That s ve of the seven possible types of LINQ clauses Here is a line-by-line description of the clauses in this query: The in the clause de nes a range variable called of type and a data source that can enumerate all the methods class
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clause lters out all the inherited methods that are not The This ensures that we are dealing declared inside class with only the 49 LINQ operators including the three utility methods clause sorts the sequence alphabetically on the name The of each method clause folds all the overloads into groups One group The called and contains a sequence of s has a operator The next that describe the overloads for the and a series of objects that group has a key called operator, and so on de ne the overloads for the clause de nes a projection that consists of an anony The extension method is used to mous class with two elds The does not expose get the number of overloads because this information These are the ve most commonly used LINQ clauses, along with the things they do best: clauses introduce a range variable and a data source clauses lter data clauses sort data
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clauses set up a set of keys and an associated list of items clauses project a result based on the range variables that are still in scope
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You ve just seen that clauses can be used to end a query Here, clause does not end the query, but it nevertheless forms a the divide in the middle of this query In many cases the range variables on one side of this divide cannot be mixed with the range variables on the other side keyword that is part of this clause is used to link or The splice the two halves of this query As such, it marks the boundary in the midst of the query over which range variables typically cannot climb The keyword go out of scope in the last part of range variables above the cannot be used in this query For instance, the range variable called clause the As the old range variables go out of scope, a new range variable called is introduced It holds the results of the rst half of this query Nevertheless, this query is still deferred, and neither half is enumerated until code is written to iterate over the elements in the computation Typically, the loop similar to the code that performs that task is some type of ones you have seen in previous chapters contextual keyword feeds the results of the rst part of the The query into the second part of the query This is called a continuation, and it keyword is most commonly used with is a form of composability The operator, but I will also show you how it can be used with the the operator
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Let Clauses clauses allow you to introduce a range variable into your program They play a role in a query expression that is very similar to that played by variable declarations in a standard C# method In fact, they are the functional programming equivalent of a type declaration in imperative code Listing 52 shows a modi cation of the re ection query we ve been is working with in the past few sections A range variable called clause and is reused in two subsequent portions of the introduced in a
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