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Shawn Wildermuth Reflection is a crucial tool in the toolboxes of most large application developers these days. In an application I created several years ago, I used reflection to detect whether some of the objects running in a system were using certain custom attributes that we had written. We used attributes to know how to serialize objects to and from the database by specifying whether an object was an atomic piece of data or whether each item in the object needed its own column. This approach allowed us to save data based on the developers needs without requiring them to change the database on every object they wrote.
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Reflection
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Lessons in this chapter:
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Lesson 1: Understanding Reflection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 831 Lesson 2: Assembly Attributes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 842 Lesson 3: Reflecting Types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 852 Lesson 4: Writing Dynamic Code. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 868 Lesson 5: Creating Code at Runtime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 876
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Before You Begin
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To complete the lessons in this chapter, you should be familiar with Microsoft Visual Basic or C# and be comfortable with the following tasks:
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Create a console application in Microsoft Visual Studio using Visual Basic or C#. Add references to system class libraries to a project. Create text files.
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Lesson 1: Understanding Reflection
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Lesson 1: Understanding Reflection
The reflection system in .NET is used to interrogate types in the type system as well as to create code on the fly. At its root, reflection presents code as an object model. From assemblies and models all the way down to the individual statements that are part of a line of code, reflection allows you to both interrogate and generate code in .NET.
After this lesson, you will be able to:
Use the Assembly class. Understand the relationship between assemblies and modules. Dynamically load an assembly. List the modules in an assembly.
Estimated lesson time: 15 minutes
Understanding Assemblies and Modules
Code in the CLR is packaged in an assembly. This metadata is the data that the CLR uses to load and execute code, and it includes type information for all the classes, structures, delegates, and interfaces in the assembly. The type information includes every method, property, event, delegate, and enumeration of each type. Additionally, there is even metadata about the actual code, including the size of the code and any local variables. Even though it is often thought of as a file, an assembly is actually a logical container for different parts of the data the CLR needs to execute code. These parts include the following:
Assembly metadata Type metadata Code (Intermediate Language code) Resources
Assembly metadata includes data that defined the assembly, such as the name, version, strong name, and culture information. The assembly metadata is also called the manifest. Type metadata is all the information that describes what a type looks like, including the namespace and type names (that is, class names), the individual members of a type (such as methods, properties, and constructors), and their parameters if any. The code is the actual Intermediate Language (IL) code that is compiled to
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