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machine code as the assembly is executed. Finally, resources are objects (such as strings, images, or files) that are used from the code. Most of the time, all these parts of an assembly are compiled into a single file, as shown in Figure 14-1.
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Single File Assembly AnAssembly.dll Assembly Metadata Type Metadata Code (IL) Resources
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Figure 14-1
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There is no requirement that an assembly be contained in a single file. In fact, in some instances you might want to separate your assembly into multiple files. (For example, when they are deployed in a click-once application, the parts of the assembly will be pulled down only as they are used.) The assembly metadata needs to be in the main assembly file. You can keep some type metadata, code, and resources in the main assembly file as well, but you can refer to other files for additional type metadata and code and have some resources outside the assembly file. This multifile approach is shown in Figure 14-2.
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Multi-file Assembly AnAssembly.dll Assembly Metadata Type Metadata Code (IL) Resources Foo.netmodule Type Metadata Code (IL)
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Figure 14-2
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Multifile assembly
Lesson 1: Understanding Reflection
Modules, on the other hand, are containers for types within an individual assembly. A module can be a container within a single assembly, or more likely it is part of a multifile assembly. In general, you will use multiple modules per assembly only in very special cases where you need to do things like mix source languages within a single assembly or provide support for modular downloading of modules. Visual Studio does not support multiple modules per assembly, so piecing together multimodule assemblies is a task that must be done either at the command line or from other tools (for example, MSBuild).
Examining an Assembly
Before we can start to examine an assembly, we need to get an instance of the Assembly class. The Assembly class supports a number of static methods to create instances of the class. Table 14-1 shows these static methods.
Table 14-1 Assembly Class Static Methods
Name GetAssembly GetCallingAssembly GetEntryAssembly GetExecutingAssembly Load LoadFile LoadFrom ReflectionOnlyLoad ReflectionOnlyLoadFrom
Description Returns an Assembly that contains a specified type Returns the Assembly that contains the code that called the current method Returns the Assembly that contains the code that started up the current process Returns the Assembly that contains the currently executing code Loads an Assembly into the current AppDomain Loads an Assembly by specifying the path Loads an Assembly into the current AppDomain located at a specific path Loads an Assembly, but allows only interrogation of the assembly, not execution Loads an Assembly located at a specific path, but allows only interrogation of the assembly, not execution
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Reflection
The static methods shown in Table 14-1 all return instances of a particular Assembly. Using GetAssembly or any of the Load methods allows you to load an Assembly that is not currently loaded. More interesting are the GetCallingAssembly, GetEntryAssembly, and GetExecutingAssembly calls. These methods allow you to retrieve an instance of the Assembly class for assemblies that are part of the current call stack. GetEntryAssembly returns an instance of the assembly that contains the start-up method (usually the executable assembly for a desktop application), as shown in the following example:
' VB Dim theAssembly As Assembly = Assembly.GetExecutingAssembly // C# Assembly theAssembly = Assembly.GetExecutingAssembly();
You can retrieve the assembly for the currently running code by calling GetExecutingAssembly. In contrast, the GetCallingAssembly retrieves an instance of the Assembly class for the method one level up in the call stack. In other words, it retrieves the assembly that contains the method that called the currently executing code. Once you have an instance of the Assembly class, you can interrogate the properties of the assembly itself. The Assembly class s instance properties and methods are detailed in Table 14-2 and Table 14-3, respectively.
Table 14-2
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