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Query Expressions
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14 showed a query using standard query operators for GroupJoin(), SelectMany(), and Distinct(), in addition to the creation of two anonymous types The result was a statement that spanned multiple lines and was fairly complex to comprehend, certainly much more complex than statements typically written in C# 20, even though it appears fully compatible with C# 20 syntax The introduction of standard query operators facilitated a far greater likelihood of scenarios where such complex statements were desirable even though the resultant code may not be In addition, the queries that standard query operators implemented were functionally very similar to queries generally implemented in SQL
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HE END OF CHAPTER
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Introducing Query Expressions
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15: Query Expressions
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The culmination of these two factors resulted in the C# language designers adding a new syntax to C# 30: query expressions With query expressions, many standard query operator statements are transformed into more readable code, code that looks very much like SQL In this chapter, I introduce the new syntax of query expressions and use this syntax to explain how to express many of the queries from the preceding chapter
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Introducing Query Expressions
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Besides iterating over all the items within a collection, two of the most frequent operations developers perform is filtering the collection so there are fewer items to iterate over or projecting the collection so the items take a different form For example, given a collection of files, we could filter it vertically to create a new collection of only the files with a cs extension, or only the ten largest files Alternatively, we could project across the file collection to create a new collection of paths to the directories the files are located in and the corresponding directory size There are many ways to perform this type of operation, but one of the easiest was introduced in C# 30: query expressions Query expressions generally begin and end with the from and select clauses, which use the contextual keywords from and select (Technically, query expressions can also end with a groupby clause, as shown later in this chapter) Listing 151 shows a query expression example and Output 151 shows the results
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Listing 151: Simple Query Expression
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using System; using SystemCollectionsGeneric; using SystemLinq; // static string[] Keywords = { "abstract", "add*", "as", "ascending*", "base", "bool", "break", "by*", "byte", "case", "catch", "char", "checked", "class", "const", "continue", "decimal", "default", "delegate", "do", "double", "descending*",
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"else", "enum", "event", "explicit", "extern", "false", "finally", "fixed", "from*", "float", "for", "foreach", "get*", "group*", "goto", "if", "implicit", "in", "int", "into*", "interface", "internal", "is", "lock", "long", "join*", "let*", "namespace", "new", "null", "object", "operator", "orderby*", "out", "override", "params", "partial*", "private", "protected", "public", "readonly", "ref", "remove*", "return", "sbyte", "sealed", "select*", "set*", "short", "sizeof", "stackalloc", "static", "string", "struct", "switch", "this", "throw", "true", "try", "typeof", "uint", "ulong", "unchecked", "unsafe", "ushort", "using", "value*", "virtual", "void", "volatile", "where*", "while", "yield*"}; private static void ShowContextualKeywords1() { IEnumerable<string> selection = from word in Keywords where !wordContains('*') select word; foreach (string keyword in selection) { ConsoleWrite(" " + keyword); } } //
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OUTPUT 151:
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abstract as base bool break byte case catch char checked class const continue decimal default delegate do double else enum event explicit extern false finally fixed float for foreach goto if implicit in int interface internal is lock long namespace new null object operator out override params private protected public readonly ref return sbyte sealed short sizeof stackalloc static string struct switch this throw true try typeof uint ulong unchecked unsafe ushort using virtual void volatile while
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In this query expression, selection is assigned the collection of C# keywords but not contextual keywords The query expression in this example includes a where clause that filters out the noncontextual keywords Developers familiar with SQL will notice that query expressions have a syntax that is similar to that of SQL so as to be familiar to the thousands of programmers who know SQL In spite of the similarities, however, there are some obvious inconsistencies The most notable of these is that rather
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