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The next task is to define the module set for your new assembly. Given that the assembly is a single file unit, you need to define only a single module. If you were to build a multi-file assembly using the DefineDynamicModule() method, you would specify an optional second parameter that represents the name of a given module (e.g., myMod.dotnetmodule). However, when creating a single-file assembly, the name of the module will be identical to the name of the assembly itself. In any case, once the DefineDynamicModule() method has returned, you are provided with a reference to a valid ModuleBuilder type: // The single-file assembly. ModuleBuilder module = assembly.DefineDynamicModule("MyAssembly", "MyAssembly.dll");

ModuleBuilder is the key type used during the development of dynamic assemblies. As you would expect, ModuleBuilder supports a number of members that allow you to define the set of types contained within a given module (classes, interfaces, structures, etc.) as well as the set of embedded resources (string tables, images, etc.) contained within. Table 17-11 describes a few of the creation-centric methods. (Do note that each method will return to you a related type that represents the type you wish to construct.) Table 17-11. Select Members of the ModuleBuilder Type

Internal name of the field used in the form HTML and URLs Explanation of the field to end users Profile category that the field will be grouped under Title of page used for browsing by the field s value Type of form field

DefineEnum() DefineResource() DefineType()

Used to emit a .NET enum definition Defines a managed embedded resource to be stored in this module Constructs a TypeBuilder, which allows you to define value types, interfaces, and class types (including delegates)

The key member of the ModuleBuilder class to be aware of is DefineType(). In addition to specifying the name of the type (via a simple string), you will also make use of the

Weight of field in relation to other profile fields Whether the user is required to enter a value (0 for no and 1 for yes) Whether the field is visible in the user registration form (1for yes and 0 for no) The level of visibility for the field (0for hidden, 1for private, 2 for public on profile pages but not on member list pages, and 3 for public on profile and list pages) Whether form automatic completion is enabled (0 for disabled and 1 for enabled) List of options to be used in a list selection field

System.Reflection.TypeAttributes enum to describe the format of the type itself. Table 17-12 lists some (but not all) of the key members of the TypeAttributes enumeration. Table 17-12. Select Members of the TypeAttributes Enumeration

Specifies that the type is abstract Specifies that the type is a class Specifies that the type is an interface Specifies that the class is nested with assembly visibility and is thus accessible only by methods within its assembly Specifies that the class is nested with assembly and family visibility, and is thus accessible only by methods lying in the intersection of its family and assembly Specifies that the class is nested with family visibility and is thus accessible only by methods within its own type and any subtypes Specifies that the class is nested with family or assembly visibility, and is thus accessible only by methods lying in the union of its family and assembly Specifies that the class is nested with private visibility Specifies that the class is nested with public visibility Specifies that the class is not public Specifies that the class is public Specifies that the class is concrete and cannot be extended Specifies that the class can be serialized

Table A-73. profile_value (profile module)

Now that you have a better understanding of the role of the ModuleBuilder.CreateType() method, let s examine how you can emit the public HelloWorld class type and the private string variable: // Define a public class named "MyAssembly.HelloWorld". TypeBuilder helloWorldClass = module.DefineType("MyAssembly.HelloWorld", TypeAttributes.Public);