When Are Signature Types Checked in Visual Basic .NET

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When Are Signature Types Checked
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Signature types are checked after an implementation has been fully processed. This is unlike type annotations that occur directly in an implementation file, which are applied before an implementation fragment is processed. This means the type information in a signature file isn t used as part of the typeinference process when processing the implementation.
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CHAPTER 7 ENCAPSULATING AND PACKAGING YOUR CODE
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Note Each signature file must appear before its corresponding implementation file in the compilation order for
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an F# project. In Visual Studio, this means the signature file must come before the implementation file in the project listing. This is because the signature is required in order to check the contents of the implementation file after the implementation file is fully processed.
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Packaging Applications
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This section covers some of the more pragmatic issues involved in in designing applications and choosing how to package both your code and data. First, however, let s talk about the sorts of things you may be building with F#.
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Packaging Different Kinds of Code
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Table 7-2 lists some of the kinds of software implemented with F#. These tend to be organized in slightly different ways and tend to use encapsulation to varying degrees. For example, encapsulation is used heavily in frameworks but not when you re writing 100-line scripts. Table 7-2. Some Kinds of Software Built Using F#
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Script
Description
A program or set of program fragments, usually in a single file and less than 1,000 lines, usually with an .fsx extension, run through F# Interactive. Sometimes also compiled. Organized using functions and occasional type definitions. Freely uses static global state. Usually has no signature file or accessibility annotations. An EXE or a web application DLL, perhaps with some supporting DLLs. Organized using namespaces, modules, functions, and some abstract types. Often uses some static global state. Some internal files and data structures may have signatures, but often these aren t needed. A component that extends an application, often compiled as a DLL containing types along with an accompanying XML file that describes the plug-in to the application. The host application loads the DLLs using .NET reflection. Generally has no static state because this lets the application instantiate multiple instances of the plug-in. Example: the DLL plug-ins for Paint.NET, a popular .NET imagemanipulation program. A collection of related type definitions, functions, and algorithms organized according to established .NET and F# library-design guidelines. Usually compiled as a DLL, strong-name signed, installed into the GAC on the target machine, and versioned as an independent entity. Generally has no static state except where it mediates essential state on the host computer or operating system.
Application
Application extension (plug-in or add-on)
Framework
CHAPTER 7 ENCAPSULATING AND PACKAGING YOUR CODE
Software Entity
Framework extension
Description
A component that extends a framework, usually by defining types that implement particular interfaces. Organized in an appropriate namespace as a simple set of classes and functions that generate objects that implement the interfaces defined in a framework. Generally has no static state. Example: the Firebird.NET API, which provides implementations of the ADO.NET Data Access framework interfaces to enable access to Firebird databases.
Using Data and Configuration Settings
So far, this book has focused on code. In reality, almost every program comes with additional data resources that form an intrinsic part of the application. Common examples of the latter include the resource strings, sounds, fonts, and images for GUI applications. Applications typically select between different data resources based on language or culture settings. Often, programs also access additional parameters, such as environment variables derived from the execution context or registry settings recording user-configuration options. It can be useful to understand the idioms used by .NET to make managing data and configuration settings more uniform. Table 7-3 shows some of the terminology used for data resources. Table 7-3. Application Data: Terminology
Terminology
Static application data
Meaning
A data resource whose name/location is always known, whose value doesn t change during execution, and that your application can generally assume always exists. Data accessed as a named, typed .NET value through code written by you or generated by a tool you re using. The code hides the complexity of locating and decoding the resource. A string, a font, an icon, a bitmap, an image, a sound, or another binary resource that is attached to a Windows application or DLL using the Win32 .res format or .NET managed .resx format. Often dependent on language/culture settings.
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