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Part IV
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The System.Type type offers the following instance methods: GetNestedType and GetNestedTypes . The System.Reflection.Assembly type offers the following instance methods: GetType, GetTypes, and GetExportedTypes . The System.Reflection.Module type offers the following instance methods: GetType, GetTypes, and FindTypes .
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Note Microsoft has defined a Backus-Naur Form grammar for type names and assemblyqualified type names that is used for constructing strings that will be passed to reflection methods . Knowledge of the grammar can come in quite handy when you are using reflection, specifically if you are working with nested types, generic types, generic methods, reference parameters, or arrays . For the complete grammar, see the FCL documentation or do a Web search for Backus-Naur Form Grammar for Type Names . You can also look at Type s MakeArrayType, MakeByRefType, MakeGenericType, and MakePointerType methods .
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Many programming languages also offer an operator that allows you to obtain a Type object from a type name that is known at compile time . When possible, you should use this operator to obtain a reference to a Type instead of using any of the methods in the preceding list, because the operator generally produces faster code . In C#, the operator is called typeof, and you use this operator typically to compare late-bound type information with early-bound (known at compile time) type information . The following code demonstrates an example of its use:
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private static void SomeMethod(Object o) { // GetType returns the type of the object at runtime (late-bound) // typeof returns the type of the specified class (early-bound) if (o.GetType() == typeof(FileInfo)) { ... } if (o.GetType() == typeof(DirectoryInfo)) { ... } }
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Note The first if statement in the code checks if the variable o refers to an object of the
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FileInfo type; it does not check if o refers to an object that is derived from the FileInfo type .
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In other words, the code above tests for an exact match, not a compatible match, which is what you would get if you use a cast or C# s is or as operators .
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Once you have a reference to a Type object, you can query many of the type s properties to learn more about it . Most of the properties, such as IsPublic, IsSealed, IsAbstract, IsClass, IsValueType, and so on, indicate flags associated with the type . Other properties, such as Assembly, AssemblyQualifiedName, FullName, Module, and so on, return the name of the type s defining assembly or module and the full name of the type . You can also query the BaseType property to obtain the type s base type, and a slew of methods will give you even more information about the type .
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23 Assembly Loading and Reflection
The FCL documentation describes all of the methods and properties that Type exposes . Be aware that there are a lot of them . In fact, Type offers about 60 public instance properties . This doesn t even include the methods and fields that Type also defines . I ll be covering some of these methods in the next section .
Building a Hierarchy of Exception-Derived Types
The code shown below uses many of the concepts discussed already in this chapter to load a bunch of assemblies into the AppDomain and display all of the classes that are ultimately derived from System.Exception . By the way, this is the program I wrote to build the exception hierarchy displayed in the FCL-Defined Exception Classes section in 20, Exceptions and State Management .
public static void Go() { // Explicitly load the assemblies that we want to reflect over LoadAssemblies(); // Recursively build the class hierarchy as a hyphen-separated string Func<Type, String> ClassNameAndBase = null; ClassNameAndBase = t => "-" + t.FullName + ((t.BaseType != typeof(Object)) ClassNameAndBase(t.BaseType) : String.Empty); // Define query to find all public Exception-derived types in this AppDomain's assemblies var exceptionTree = (from a in AppDomain.CurrentDomain.GetAssemblies() from t in a.GetExportedTypes() where t.IsClass && t.IsPublic && typeof(Exception).IsAssignableFrom(t) let typeHierarchyTemp = ClassNameAndBase(t).Split('-').Reverse().ToArray() let typeHierarchy = String.Join("-", typeHierarchyTemp, 0, typeHierarchyTemp.Length - 1) orderby typeHierarchy select typeHierarchy).ToArray(); // Display the Exception tree Console.WriteLine("{0} Exception types found.", exceptionTree.Length); foreach (String s in exceptionTree) { // For this Exception type, split its base types apart String[] x = s.Split('-'); // Indent based on # of base types and show the most-derived type Console.WriteLine(new String(' ', 3 * (x.Length - 1)) + x[x.Length - 1]); } }
private static void LoadAssemblies() { String[] assemblies = { "System, PublicKeyToken={0}", "System.Core, PublicKeyToken={0}", "System.Data, PublicKeyToken={0}", "System.Design, PublicKeyToken={1}",
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