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becausewewanttoemphasizeLINQasamanipulatorofobjectsets,butperiodically we will show both, for we do not wish to imply that one style is better than the other Although the preceding example was quite simple, a LINQ statement might be as complex as the one shown in Listing 71
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Listing 71: A Long and Complex LINQ Query
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cbxOrdersDisplayMember = "Text"; cbxOrdersValueMember = "Id"; cbxOrdersDataSource = ( employeeOrders Where(order => (OrderEntryDataIsActive(orderobjectState))) OrderBy(active => activeparentCustomerCompanyName) ThenByDescending(active => activeNetValue) ThenByDescending(active => activeOrderDate) Select(sorted => new { Id = sortedOrderID, Text = sortedparentCustomerCustomerID + " - " + sortedNetValueToString("c") PadLeft(9)Substring(0, 9) + " - " + sortedOrderDate ToString("dd-MMM-yy") }) ) ToList();
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The code in Listing 71 comes from one of this chapter s sample programs It does the following: 1 Extracts all the active orders from the Orders dictionary object referenced by employeeOrders 2 Sorts them into descending order date within descending net value within customer sequence 3 Converts each order into an object of an unnamed class containing a An order ID property named Id
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b A new property named Text that is the concatenation of the customer ID / net value / order date propertys 4 Converts that collection into a List 5 Assigns that List to the data source property of a ComboBox such that the OrderId of the order subsequently selected by the user can be easily determined Listing 72 shows the alternative syntax for the statement shown in Listing 71
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Listing 72: The Same LINQ Query Alternative Syntax
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cbxOrdersDisplayMember = "Text"; cbxOrdersValueMember = "Id"; cbxOrdersDataSource = (from order in employeeOrders where AppDataIsActive(orderobjectState) orderby orderparentCustomerCompanyName, orderNetValue descending, orderOrderDate descending select new { Id = orderOrderID, Text = StringFormat("{0} - {1} - {2}", orderparentCustomerCustomerID, orderNetValueToString("c") PadLeft(9)Substring(0, 9), orderOrderDate ToString("dd-MMM-yy")) })ToList(); }
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One look at the code in Listing 71 or Listing 72 should make anyone who is new to LINQ realize that some additional information about these LINQ methods and their syntax will be necessary before we can begin programming But we need to start our LINQ programming discussion even further back than LINQ itself Since LINQ provides for the manipulation of sets of objects, we must be sure that we understand the set classes that are provided with NET and the specific capabilities of those classes upon which LINQ is built
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711 Set Classes in NET The NET set class fall into a variety of differing groups, such as arrays versus collections or generic collection classes versus specialty collection
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classes LINQ doesn t care what category a set class falls into What it does need, however, is for the class to have implemented the IEnumerable interface If the class has implemented IEnumerable, LINQ, like foreach, can work with objects of that class If the class also implements IList, LINQ may be able to provide performance optimization for certain operators But the functionality aspect of LINQ is dependent upon the target class having implemented IEnumerable, whether that class is an ADONET DataTable, a List<Employee>, or a class of your own design The most commonly used general-purpose set classes, the SystemArray class and the SystemCollectionsGeneric classes, provide the following capabilities that you will often draw upon when writing your LINQ expressions
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The items within the set can be restricted to objects of a certain class
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Thus, we can speak of an array of strings or a list of customers and be assured that our array will contain only strings and our list will contain only customers Because, as we mentioned earlier, the set class must implement IEnumerable, the items within the set can be enumerated That is, they can be accessed one at a time We often take advantage of enumeration through the use of the foreach statement Even collection classes that do not provide indexing, such as Queue and Stack, provide enumeration through the IEnumerable interface and thus provide foreach capability The set can determine whether an object is in the set The testing method may be named Contains or it may be named Exists, but there is always a way to test As we write our LINQ code, you will see these common features manifesting themselves within the various LINQ functions that we will be using
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712 LINQ in the Compact Framework In NET 35, there are five major variations on LINQ: LINQ to SQL, LINQ to Entities, LINQ to Dataset, LINQ to Objects, and LINQ to XML The first two, LINQ to SQL and LINQ to Entities, are primarily intended for accessing relational databases and are not available in the Compact Framework This is why we stated earlier that, in the Compact Framework, LINQ is not primarily a tool for simplifying the access of relational databases, but
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