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When the compiler encounters the object initializer of an anonymous type, it creates a new class type with a private name that it constructs. For each member initializer, it infers its type and creates a private variable of that type in the new class, and it creates a read/write property to access the variable. The property has the same name as the member initializer. Once the anonymous type is constructed, the compiler creates an object of that type. Besides the assignment form of member initializers, anonymous type object initializers also allow two other forms: simple identifiers and member access expressions. These two forms are called projection initializers. The following variable declaration shows all three forms. The first member initializer is in the assignment form. The second is an identifier, and the third is a member access expression. var student = new { Age = 19, Major, Other.Name }; For example, the following code uses all three types. Notice that the projection initializers must be defined before the declaration of the anonymous type. Major is a local variable, and Name is a static field of class Other. class Other { static public string Name = "Mary Jones"; } class Program { static void Main() { string Major = "History"; Assignment form Identifier var student = new { Age = 19, Other.Name, Major}; Member access Console.WriteLine("{0}, Age {1}, Major: {2}", student.Name, student.Age, student.Major); } } This code produces the following output: Mary Jones, Age 19, Major: History The projection initializer form of the object initializer just shown has exactly the same result as the assignment form shown here: var student = new { Age = Age, Name = Other.Name, Major = Major}; Although your code cannot see the anonymous type, it s visible to object browsers. If the compiler encounters another anonymous type with the same parameter names, with the same inferred types, and in the same order, it will reuse the type and create a new instance not create a new anonymous type.
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INTRODUCTION TO LINQ
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Query Syntax and Method Syntax
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There are two syntactic forms you can use when writing LINQ queries query syntax and method syntax. Query syntax is a declarative form that looks very much like an SQL statement. Query syntax is written in the form of query expressions. Method syntax is an imperative form, which uses standard method invocations. The methods are from a set called the standard query operators, which will be described later in the chapter. You can also combine both forms in a single query.
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Microsoft recommends using query syntax because it s more readable, more clearly states your query intentions, and is therefore less error-prone. There are some operators, however, that can be written only using method syntax.
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Note Queries expressed using query syntax are translated by the C# compiler into method invocation form. There is no difference in runtime performance between the two forms.
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The following code shows all three query forms. In the method syntax part, you might find that the parameter of the Where method looks a bit odd. It s a lambda expression, as was described in 15. I ll cover its use in LINQ a bit later in the chapter. static void Main( ) { int[] numbers = { 2, 5, 28, 31, 17, 16, 42 }; var numsQuery = from n in numbers where n < 20 select n; var numsMethod = numbers.Where(x => x < 20); int numsCount = (from n in numbers where n < 20 select n).Count(); foreach (var x in numsQuery) Console.Write("{0}, ", x); Console.WriteLine(); foreach (var x in numsMethod) Console.Write("{0}, ", x); Console.WriteLine(); Console.WriteLine(numsCount); } This code produces the following output: 2, 5, 17, 16, 2, 5, 17, 16, 4 // Query syntax
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