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Operator Type Partitioning
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* * * Join *
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Ordering Element * * * Set * *
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Locating and Grouping the LINQ Operators
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Operator Type Operator Name Operator Type Operator Name
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* * Projection + Aggregate * * *, * * * Grouping Equality Restriction * + + * *
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These operators provide support for set operations, joins, ordering, grouping, and aggregation Other operators, such as the Element and Partitioning types, allow you to easily access individual elements returned by a query Don t look at the list of operators shown in Table 61 as a democratic brotherhood of equals As you learned in the previous chapter, you must , , , , and master ve core operators if you want to understand LINQ The clauses based on these operators, and , are the body and limbs of a query plus those formed with expression They are the structure on which a query expression is built When trying to decide which LINQ operator to use, there is no need to scan the list of all the operators to nd the one that ts your current needs Instead, you should rst master the big ve and then learn to pick and choose from the others as you nd the need Do you need to perform a calculation If so, take a look at the Aggregate operators Do you need to nd
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6: Quer y Operators
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the union or intersection of two sequences Take a look at the Set operators to a Take a look at the Do you want to convert an Conversion operators The LINQ operators form a rich and varied API Studying them can help you reach a level of pro ciency suf cient to support writing sophisticated LINQ queries If you can create simple queries quickly and ef ciently, you will nd that the small gaps in your knowledge will be lled in automatically during the course of your daily work
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Code Reuse Throughout this chapter I will need to repeat the loop that displays the data returned from a LINQ to Objects query Because the lines of code for this process rarely change, I have created the following simple method, loop repeatedly: which I will call instead of showing you the same
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I will also frequently use this code to display a title to the console:
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Locating and Grouping the LINQ Operators
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Locating the LINQ Operators The LINQ to Objects operators are implemented in a class called You have already seen how to use LINQ to Objects to write a Re ection query that enumerates these methods You can also nd their declarations, but not their full source code, by using the tools built into the Visual Studio IDE To nd the declarations, rst start a standard , console application In the main block, type in , and press F12 Alternatively, you put the cursor on the word can right-click and select Go to De nition You are taken to the metadata for class, as shown in Figure 61 the
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6: Quer y Operators
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The IDE uses metadata to display the members of the
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You can learn a lot about these operators simply by looking at these declarations After a time, you may even nd that you can implement some of the simpler operators yourself just by looking at their declaration and having a little knowledge of how they behave When looking through these operators, you might notice that all but three of them are extension methods The exceptions are a set of three util, , and , which clearly ities Here are the declarations for are not extension methods:
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If you re curious, the following query nds the three utility methods, , , and returning the declaration for
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Generation Operators
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This query is found in the sample program called LinqRe ectionQuery that accompanies this book
Generation Operators
The simple Generation operators shown in Table 62 allow you to create enumerations and test the contents of existing sequences that implement Some of these operators are designed to act as helper methods that you might use in test code, or for highly targeted scenarios in production code The samples in this section are found in the GenerationOperators program that is available on the book s web site None of the , , and are operators in the Generation group is deferred not implemented as extension methods
Table 62 Generation Operators Description Creates an enumeration with a range of values, such as the integers 1 to 10