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C# 30: A Beginner s Guide
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// Use a let clause and a nested from clause using System; using SystemLinq; class LetDemo { static void Main() { string[] strs = { "alpha", "beta", "gamma" }; // Create a query that obtains the characters in the // strings, returned in sorted order Notice the use // of a nested from clause var chrs = from str in strs chrArray refers to an array of characters let chrArray = strToCharArray() obtained from str from ch in chrArray orderby ch select ch; ConsoleWriteLine("The individual characters in sorted order:"); // Execute the query and display the results foreach(char c in chrs) ConsoleWrite(c + " "); ConsoleWriteLine(); } }
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The output is shown here:
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The individual characters in sorted order: a a a a a b e g h l m m p t
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In the program, notice how the let clause assigns to chrArray a reference to the array returned by strToCharArray( ):
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let chrArray = strToCharArray()
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After the let clause, other clauses can make use of chrArray Furthermore, because all arrays in C# implement IEnumerable<T>, chrArray can be used as a data source for a second, nested from clause This is what happens in the example It uses the nested from to enumerate the individual characters in the array, sorting them into ascending sequence and returning the result You can also use a let clause to hold a non-enumerable value For example, the following is a more efficient way to write the query used in the IntoDemo program shown in the preceding section
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var webAddrs = from addr in websites let idx = addrLastIndexOf("") where idx != -1
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Call LastIndexOf( ) only once, storing the result in idx
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14: Introducing LINQ
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group addr by addrSubstring(idx) into ws where wsCount() > 2 select ws;
In this version, the index of the last occurrence of a period is assigned to idx This value is then used by Substring( ) This prevents the search for the period from having to be conducted twice
Join Two Sequences with join
When working with databases, it is common to want to create a sequence that correlates data from two different data sources For example, an online store might have one database that associates the name of an item with its item number and a second database that associates the item number with its in-stock status Given this situation, you might want to generate a list that shows the in-stock status of items by name, rather than by item number You can do this by correlating the data in the two databases Such an action is easy to accomplish in LINQ through the use of the join clause The general form of join is shown here (in context with the from clause): from range-varA in data-sourceA join range-varB in data-sourceB on range-varAproperty equals range-varBproperty The key to using join is to understand that each data source must contain data in common and that data can be compared for equality Thus, in the general form, data-sourceA and datasourceB must have something in common that can be compared The items being compared are specified by the on section Thus, when range-varAproperty is equal to range-varBproperty, the correlation succeeds In essence, join acts like a filter, allowing only those elements that share a common value to pass through When using join, often the sequence returned is a composite of portions of the two data sources Thus, join lets you generate a new list that contains elements from two different data sources This enables you to organize data in a new way The following program creates a class called Item, which encapsulates an item s name with its number It creates another class called InStockStatus, which links an item number with a Boolean property that indicates whether or not the item is in stock It also creates a class called Temp, which has two fields, one string and one bool Objects of this class will hold the result of the query The query uses join to produce a list in which an item s name is associated with its in-stock status
// Demonstrate join using System; using SystemLinq; // A class that links an item name with its number class Item {
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