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FSharp.Compiler.CodeDom, Version=1.9.2.9, Culture=neutral, PublicKeyToken=a19089b1c74d0809"/> </compilers> </system.codedom> </configuration> In the configuration file, you first configure the connection string referenced by name as NorthwindData, which you used earlier in the module that contains the data-access functionality. Connection strings describe the connection details to the database and are discussed in 15. In the second section, you need to reference the additional .NET and F# Linq assemblies that we are using in the project. These assemblies are installed in the GAC, so you can just add a reference to them. The additional assemblies, namely, the FSharp.Linq.dll file, which includes the F# Linq implementation, and northwind.dll, which includes the generated Northwind type, can simply be copied to the Bin directory of the application, and ASP.NET will discover them automatically. Finally, the web.config file also has to include a configuration of the F# CodeDom provider.
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So far you ve seen some very simple kinds of web applications with ASP.NET and F#. In practice, ASP.NET offers an enormously powerful framework for all aspects of server-side web development. In the following sections we ll explore some additional aspects, though for full details we recommend you consult some of the excellent books dedicated to the topic of ASP.NET. Some of these books are listed at http://www.expert-fsharp.com/Topics/WebProgramming.
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ASP.NET Directives
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The first line of an .aspx file usually contains special markup embedded inside <%@ ... %> ... %> containing a number of ASP.NET directives, which are instructions given to the processing environment, indicating, among other things, which scripting language is used. Table 14-4 explains the most important directives and some of their attributes.
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Table 14-4. Some ASP.NET Directives and Their Attributes
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Directive/Attribute
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Page or Control AutoEventWireup CodeFile Inherits Language Import
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Wires page events that follow the Page_ naming convention automatically if true (default). If false, event handlers need to be wired explicitly. Specifies the path to the code-behind file. Specifies the name of the class that goes together with the page. Specifies the language used for writing inline code in the page. Opens a namespace specified by the Namespace attribute and makes it available to all code in the page.
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Table 14-4. Some ASP.NET Directives and Their Attributes
Directive/Attribute
Register OutputCache
Description
Registers a user control for use with the page. See the section Creating Custom ASP.NET Server Controls later in this chapter. Declaratively controls caching; if present, ASP.NET keeps the rendered output of a page or a control in a cache for a specified amount of time. References an external assembly. The Name attribute can be used to specify the name of the assembly (without the extension). Specifies that the page implements the interface specified in the Interface attribute. Associates another page or user control with the current one. The Control, Page, or VirtualPath attribute can be used to identify the component to be referenced, causing it to be compiled together.
Assembly Implements Reference
Server Controls
Ordinary HTML markup in web forms such as <strong>, <ul>, and <h2> is treated as text and is passed to the browser verbatim (via the LiteralControl server control class). On the other hand, explicit server controls (those with the runat="server" attribute) are processed on the server and translated to HTML markup (just to illustrate, there are server controls that equate to hundreds of HTML tags, and many can be mapped nearly one to one). All server controls can be programmatically managed, which typically means you customize the way they respond to various events or how they appear or behave visually. Categorically speaking, there are two main types of server controls: HTML server controls that directly correspond to an HTML element and web server controls. The second type can be divided into several groups depending on the use of the control. There are, for example, validation controls that ensure that entered values fulfill some criteria, data source controls similar to the ObjectDataSource mentioned earlier, membership controls for handling user login and registration, and many others. In Listing 14-2 you saw server controls such as labels and buttons, both of which are web server controls. It is beyond the scope of this book to discuss the great number of web server controls available in ASP.NET 2.0 and above. As a reference, Table 14-5 shows some of the ones most commonly used.
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