ASP.NET Web PDF Document Viewer/Editor Control Library

Developing Ajax applications can be done in two ways when using F#: You can manually write and serve additional JavaScript files as part of your web application. You can use the F# Web Tools to write both client and server code purely in F#. Developing Ajax applications by the first technique follows a fairly standard path mostly independent of F#. You can find more details on this technique at http://www.expert-fsharp.com/ Topics/WebProgramming.

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CREATE XML SCHEMA COLLECTION CustomerSchemaCollection AS N'< xml version="1.0" encoding="utf-16" > <!-- Put your schema here! --> </xs:schema>'; Content vs. Document Storage Typed XML columns come in two varieties: content and document. Surprisingly, the default is content, which means that a column can store XML with multiple top-level elements. To explicitly define content storage, specify it when declaring the XML column: CREATE TABLE Customer( CustomerID int, CustomerData xml (CONTENT CustomerSchemaCollection) ) Alternatively, you can constrain the XML column to accept only XML documents that have a single top-level element. You do this using the DOCUMENT keyword, as we shown in the following example: CREATE TABLE Customer3( CustomerID int, CustomerData xml (DOCUMENT CustomerSchemaCollection) )

Table 7-5 shows the actual data used in Figure 7-1. The third column shows the percentage of the elapsed time for the current fetch size as compared to the previous fetch size. For example, the elapsed time for a fetch size of 20 was 50.61% of the elapsed time for a fetch size of 10. Table 7-5. Elapsed Times with Changing Fetch Sizes

F# Web Tools is an open source project at http://www.codeplex.com/fsharpwebtools. These tools represent an extremely powerful way of writing robust, efficient, integrated client/server applications in a single, type-checked framework. In particular, they draw on several advanced features of F#, the combination of which offers a unique programming experience for web applications: Client-side and server-side code is authored in one project, and code to handle clientside events can be written in the same way as server-side event handlers that we used in many places in this chapter. The program runs initially as a server-side application. The client-side code is written as an F# workflow and is automatically translated to JavaScript using F# quotations and reflection and is served to the client. (See 9 for details on F# quotations and workflows.) The client side can also use some .NET and F# libraries. The calls are mapped to a corresponding JavaScript functionality through fairly straightforward techniques. The client side may make asynchronous calls to the server using variations on the techniques described in 13. Some type safety is guaranteed by making modal distinctions using F# workflows. These tools were under development at the time the book was written, and some details of their use are likely to change. For this reason we don t give detailed code using these tools in this book, though this chapter gives a good grounding in the ASP.NET techniques on which the tools are based. Figure 14-4 shows part of one sample web application written using F# Web Tools. In this sample, which is authored entirely in F#, all symbolic computation is executed as JavaScript on the client side. The image displaying the curve is generated on the server side, since JavaScript has relatively weak abilities for image generation in a portable fashion.

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Much like an object, the XML data type exposes several methods you can use to query and modify the XML data. These methods are listed in Table 11-8. Table 11-8. XML Data Type Methods