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Using Type s methods and properties, it is possible to obtain detailed information about a type at runtime This is an extremely powerful feature, because once you have obtained information about a type, you can invoke its constructors, call its methods, and use its properties Thus, reflection enables you to use code that was not available at compile time The Reflection API is quite large, and it is not possible to cover the entire topic here (Complete coverage of reflection could easily fill an entire book!) However, because the Reflection API is logically designed, once you understand how to use a part of it, the rest just falls into place With this thought in mind, the following sections demonstrate four key reflection techniques: obtaining information about methods, invoking methods, constructing objects, and loading types from assemblies

5 Web Intelligence presents you with a list of States Choose the desired store location and click the double arrow to add it to the pane Value(s) Selected In this example, select New York and Texas

Once you have a Type object, you can obtain a list of the public methods supported by the type by using GetMethods( ) One form is shown here: MethodInfo[ ] GetMethods( ) It returns an array of MethodInfo objects that describe the methods supported by the invoking type MethodInfo is in the SystemReflection namespace MethodInfo is derived from the abstract class MethodBase, which inherits MemberInfo Thus, the properties and methods defined by all three of these classes are available for your use For example, to obtain the name of a method, use the Name property Two members that are of particular interest at this time are ReturnType and GetParameters( ) The return type of a method is found in the read-only ReturnType property, which is an object of Type The method GetParameters( ) returns a list of the parameters associated with a method It has this general form: ParameterInfo[ ] GetParameters( ); The parameter information is held in a ParameterInfo object ParameterInfo defines properties and methods that describe the parameter Two properties that are of particular value are Name, which is a string that contains the name of the parameter, and ParameterType, which describes the parameter s type The parameter s type is encapsulated within a Type object Here is a program that uses reflection to obtain the methods supported by a class called MyClass For each method, it displays the return type and name of the method, and the name and type of any parameters that each method may have

FIGURE 159 A micromechanical lock with a spiral groove cam (courtesy, Sandia National Labs MEMS, S&T Department, wwwmemssandiagov)

// Analyze methods using reflection using System; using SystemReflection; class MyClass { int x; int y;

6 Click OK to close the List of Values dialog and return to the query panel 7 Notice that in this dialog box, semicolons separate multiple values The two conditions are connected with an AND in the SQL statement In the SQL, the values are separate by commas

Part I:

another component If a wrong decision is made during the sequence, the pin gets stuck in the wheel This device is equipped with an antireverse spring so that an incorrect sequence cannot be corrected by trial and error A modi ed design with a translating groove cam is discussed next 1564 Micromechanical Lock II Translating Groove Cam The mechanical lock shown in Fig 1510a is more sophisticated than the one just discussed It has a slider in which there is a groove cam The slider also has rack teeth so that it can be actuated A pin runs in the groove and is actuated with an electrostatic comb drive The slider is engaged with an antireverse pinion to prevent backtracking The independent actuations of the slider and the pin are coordinated to permit the slider to move its entire course and to release another component A detailed view of the groove cam is shown in Fig 1510b 1565 Countermeshing Gear Discriminator Device Another MEMS device that acts like a mechanical lock is the gear discriminator shown in Fig 1511a It has three levels of gears with some teeth missing on each of them and the remaining teeth selectively placed These gears countermesh in the sense that the meshing gear teeth approach each other from opposite directions, unlike conventional gears where the approach for both teeth is in the same direction Consequently, they need