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This creates a class type that has three public read-only properties: Count, Max, and Min These are given the values 10, 100, and 0, respectively These properties can be referred to by name by other code Notice that an anonymous type uses object initializers to initialize the properties As explained in 8, object initializers provide a way to initialize an object without explicitly invoking a constructor This is necessary in the case of anonymous types because there is no way to explicitly call a constructor (Recall that constructors have the same name as their class In the case of an anonymous class, there is no name So, how would you invoke the constructor ) Because an anonymous type has no name, you must use an implicitly typed variable to refer to it This lets the compiler infer the proper type For example,

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var myOb = new { Count = 10, Max = 100, Min = 0 }

creates a variable called myOb that is assigned a reference to the object created by the anonymous type expression This means that the following statements are legal:

ConsoleWriteLine("Count is " + myObCount); if(i <= myObMax && i >= myObMin) //

Part I:

9 1 = ( e2 e) [sin 4 sin 2] 2 4

Remember, when an anonymous type is created, the identifiers that you specify become read-only public properties Thus, they can be used by other parts of your code Although the term anonymous type is used, it s not quite completely true! The type is anonymous relative to you, the programmer However, the compiler does give it an internal name Thus, anonymous types do not violate C# s strong type checking rules To fully understand the value of anonymous types, consider this rewrite of the previous program that demonstrated join Recall that in the previous version, a class called Temp was needed to encapsulate the result of the join Through the use of an anonymous type, this placeholder class is no longer needed and no longer clutters the source code to the program The output from the program is unchanged from before

1 I want to inform employees about the date of the summer picnic 2 I want employees to RSVP regarding the summer picnic by the fteenth of the month

// Use an anonymous type to improve the join demo program using System; using SystemLinq; // A class that links an item name with its number class Item { public string Name { get; set; } public int ItemNumber { get; set; } public Item(string n, int inum) { Name = n; ItemNumber = inum; } } // A class that links an item number with its in-stock status class InStockStatus { public int ItemNumber { get; set; } public bool InStock { get; set; } public InStockStatus(int n, bool b) { ItemNumber = n; InStock = b; } } class AnonTypeDemo { static void Main() { Item[] items = { new Item("Pliers", 1424), new Item("Hammer", 7892), new Item("Wrench", 8534), new Item("Saw", 6411) }; InStockStatus[] statusList = new InStockStatus(1424, new InStockStatus(7892, new InStockStatus(8534, new InStockStatus(6411, }; { true), false), true), true)

19:

1 3

// Create a query that joins Item with InStockStatus to // produce a list of item names and availability // Now, an anonymous type is used var inStockList = from item in items join entry in statusList on itemItemNumber equals entryItemNumber select new { Name = itemName, InStock = entryInStock }; ConsoleWriteLine("Item\tAvailable\n"); // Execute the query and display the results foreach(var t in inStockList) ConsoleWriteLine("{0}\t{1}", tName, tInStock); } }

Pay special attention to the select clause:

select new { Name = itemName, InStock = entryInStock };