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This abstract class contains a number of static methods that allow you to load, investigate, and manipulate an assembly. This class allows you to discover numerous details behind an assembly s identity (version information, culture information, and so forth). This abstract class holds information for a given event. This abstract class holds information for a given field. This is the abstract base class that defines common behaviors for the EventInfo, FieldInfo, MethodInfo, and PropertyInfo types. This abstract class contains information for a given method. This abstract class allows you to access a given module within a multi-file assembly. This class holds information for a given parameter. This abstract class holds information for a given property.

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To understand how to leverage the System.Reflection namespace to programmatically read .NET metadata, you need to first come to terms with the System.Type class.

The System.Type class defines a number of members that can be used to examine a type s metadata, a great number of which return types from the System.Reflection namespace. For example, Type.GetMethods() returns an array of MethodInfo objects, Type.GetFields() returns an array of FieldInfo objects, and so on. The complete set of members exposed by System.Type is quite expansive; however, Table 15-2 offers a partial snapshot of the members supported by System.Type (see the .NET Framework 4.0 SDK documentation for full details).

The contact table stores the contact form category settings. Table A-28. contact (contact module)

IsAbstract IsArray IsClass IsCOMObject IsEnum IsGenericTypeDefinition IsGenericParameter IsInterface IsPrimitive IsNestedPrivate IsNestedPublic IsSealed IsValueType GetConstructors() GetEvents() GetFields() GetInterfaces() GetMembers() GetMethods() GetNestedTypes() GetProperties() FindMembers() GetType() InvokeMember()

These properties (among others) allow you to discover a number of basic traits about the Type you are referring to (e.g., if it is an abstract entity, an array, a nested class, and so forth).

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These methods (among others) allow you to obtain an array representing the items (interface, method, property, etc.) you are interested in. Each method returns a related array (e.g., GetFields() returns a FieldInfo array, GetMethods() returns a MethodInfo array,etc.). Be aware that each of these methods has a singular form (e.g.,GetMethod(), GetProperty(), etc.) that allows you to retrieve a specific item by name, rather than an array of all related items. This method returns a MemberInfo array based on search criteria. This static method returns a Type instance given a string name. This method allows late binding for a given item. You ll learn about late binding later in this chapter.

Obtaining a Type Reference Using System.Object.GetType()

Primary key: unique category ID Category name Comma-separated list of recipient e-mail addresses Text of the automatic reply message

You can obtain an instance of the Type class in a variety of ways. However, the one thing you cannot do is directly create a Type object using the new keyword, as Type is an abstract class. Regarding your first choice, recall that System.Object defines a method named GetType(), which returns an instance of the Type class that represents the metadata for the current object: // Obtain type information using a SportsCar instance. SportsCar sc = new SportsCar(); Type t = sc.GetType(); Obviously, this approach will only work if you have compile-time knowledge of the type you wish to reflect over (SportsCar in this case) and currently have an instance of the type in memory. Given this restriction, it should make sense that tools such as ildasm.exe do not obtain type information by directly

Note I have called this script dname rather than dirname because it doesn t follow the POSIX specification for the dirname command. In the next chapter, there is a shell function called dirname that does implement the POSIX command.

calling System.Object.GetType() for each type, given the ildasm.exe was not compiled against your custom assemblies!

Obtaining a Type Reference Using typeof()

The category s weight Flag to indicate whether the category is selected by default (1 for yes and 0 for no)

The next way to obtain type information is using the C# typeof operator: // Get the Type using typeof. Type t = typeof(SportsCar); Unlike System.Object.GetType(), the typeof operator is helpful in that you do not need to first create an object instance to extract type information. However, your code base must still have compiletime knowledge of the type you are interested in examining, as typeof expects the strongly typed name of the type.

Obtaining a Type Reference Using System.Type.GetType()

The date_format_locale table stores configured date formats for each locale. Table A-30. date_format_locale