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When a *.dll or *.exe has been created using a .NET-aware compiler, the binary blob is termed an assembly. You will examine numerous details of .NET assemblies in 14. However, to facilitate the discussion of the .NET runtime environment, you do need to understand some basic properties of this new file format. As mentioned, an assembly contains CIL code, which is conceptually similar to Java bytecode in that it is not compiled to platform-specific instructions until absolutely necessary. Typically, absolutely necessary is the point at which a block of CIL instructions (such as a method implementation) is referenced for use by the .NET runtime. In addition to CIL instructions, assemblies also contain metadata that describes in vivid detail the characteristics of every type living within the binary. For example, if you have a class named SportsCar, the type metadata describes details such as SportsCar s base class, which interfaces are implemented by SportsCar (if any), as well as a full description of each member supported by the SportsCar type. .NET metadata is always present within an assembly, and is automatically generated by a .NET-aware language compiler. Finally, in addition to CIL and type metadata, assemblies themselves are also described using metadata, which is officially termed a manifest. The manifest contains information about the current version of the assembly, culture information (used for localizing string and image resources), and a list of all externally referenced assemblies that are required for proper execution. You ll examine various

By deriving from StringDictionary, you gain the ability to use the EncryptedQueryString like an ordinary string collection As a result, you can add information to the EncryptedQueryString in the same way you add information to the RequestQueryString collection Here s an example: encryptedQueryString("value1") = "Sample Value" Best of all, you get this functionality for free, without needing to write any additional code So, with just this rudimentary class, you have the ability to store a collection of name/value strings But how do you actually place this information into the query string The EncryptedQueryString class provides a ToString() method that examines all the collection data and combines it in a single encrypted string First, the EncryptedQueryString class needs to combine the separate collection values into a delimited string so that it s easy to split the string back into a collection on the destination page.

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tools that can be used to examine an assembly s types, metadata, and manifest information over the course of the next few chapters.

Like SQL, Hibernate supports passing parameters in HQL queries. This means that you can retrieve a User via a passed ID attribute. For this example, we need a method to extract a User by his e-mail address, so let's add the method to the UserDao interface and then implement it into the UserDaoHibernateImpl class with the following code: public User findUserByEmail(String email){ String HQL = "from User u where u.email = :email"; Query query = getSession().createQuery(HQL); query.setString("email", email); return (User)query.uniqueResult(); } As you can see in the code above and in Table 5-2 the Query object provides lots of methods to define the parameter name, type, and value.

In this case, the ToString() method uses the conventions of the query string, separating each value from the name with an equal sign (=) and separating each subsequent name/value pair with the.

In a great number of cases, there is a simple one-to-one correspondence between a .NET assembly and the binary file (*.dll or *.exe). Thus, if you are building a .NET *.dll, it is safe to consider that the binary and the assembly are one and the same. Likewise, if you are building an executable desktop application, the *.exe can simply be referred to as the assembly itself. As you ll see in 14, however, this is not completely accurate. Technically speaking, if an assembly is composed of a single *.dll or *.exe module, you have a single-file assembly. Single-file assemblies contain all the necessary CIL, metadata, and associated manifest in an autonomous, single, well-defined package. Multi-file assemblies, on the other hand, are composed of numerous .NET binaries, each of which is termed a module. When building a multi-file assembly, one of these modules (termed the primary module) must contain the assembly manifest (and possibly CIL instructions and metadata for various types). The other related modules contain a module-level manifest, CIL, and type metadata. As you might suspect, the primary module documents the set of required secondary modules within the assembly manifest.

Visual Studio 2005 is available in several versions. This chapter assumes you are using the full Visual Studio 2005 Professional or Visual Studio 2005 Team System. If you are using the scaled-down Visual Web Developer 2005 Express Edition, you will lose some features. Most notably, you won t be able to create separate components with class library projects.

Note 14 will examine the distinction between single-file and multi-file assemblies in detail. Be aware,

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