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Convert/truncate to sbyte Convert/truncate to byte Convert/truncate to int16 Convert/truncate to uint16 Convert/truncate to int32 Convert/truncate to uint32 Convert/truncate to int64 Convert/truncate to uint64 Convert to float32/single Convert to float/double

Still another option is the classic UNIX client-server approach, whereby the Business Logic and Data Access layers are merged, keeping the presentation, UI, and Data Storage tiers as dumb as possible (see Figure 1-12).

Now loop through the abbreviations array: for (var i=0; i<abbreviationslength; i++) { To get the definition provided by the current abbreviation, use the getAttribute method on the title attribute Store the value in a variable called definition: var definition = abbreviations[i]getAttribute("title"); To get the abbreviation within the abbr tag, use the nodeValue property We want the value of the text node within the abbr element In all the occurrences of the abbr element in explanationhtml, the text node is the first (and only) node within the element; in other words, the text node is the first child of the abbr element node: abbreviations[i]firstChild However, it s possible that the text node could be nested within other elements Consider this piece of markup: <abbr title="Document Object Model"><em>DOM</em></abbr> In this case, the first child of the abbr element node is the em element node.

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Unfortunately, once again, this approach falls afoul of the non-interactive user experience problem: the data must round-trip to the Business Logic/Data Access tier for any validation or manipulation. This is especially problematic if the Business Logic/Data Access tier is running on a separate application server, because then you re faced with network latency and contention issues, too. Also, the central application server can become a performance bottleneck, because it s the only machine doing any work for all the users of the application.

sbyte (-17) byte 255 int16 0 uint16 65535 int 17.8 uint32 12 int64 (-100.4) uint64 1 float32 65 float 65

I wish this book included the secret that allows you to write all your logic in one central location, thereby avoiding all of these awkward issues. Unfortunately, that s not possible with today s technology: putting the business logic only on the client, application server, or database server is problematic, for all the reasons given earlier. But something needs to be done about it, so what s left What s left is the possibility of centralizing the business logic in a Business Logic layer that s deployed on the client (or web server), so that it s accessible to the UI layer; and in a Business Logic layer that s deployed on the application server, so that it s able to interact efficiently with the Data Access layer. The end result is the best of both worlds: a rich and interactive user experience and efficient high-performance back-end processing when interacting with the database (or other data source). In the simple cases in which there is no application server, the Business Logic layer is deployed only once: on the client workstation or web server, as shown in Figure 1-13. Ideally, this business logic will run on the same machine as the UI code when interacting with the user, but on the same machine as the data access code when interacting with the database. (As discussed earlier, all of this could be on one machine or a number of different machines, depending on your physical architecture.) It must provide a friendly interface that the UI developer can use to invoke any validation and manipulation logic, and it must also work efficiently with the Data Access tier to get data in and out of storage.

These conversions are all unchecked in the sense that they will not raise exceptions. Again, the Microsoft.FSharp.Core.Operators.Checked module has corresponding definitions of these operators. An alternative is to use the .NET static methods contained in the type System.Convert, such as System.Convert.ToDouble( ). These do perform checking, which means they raise an exception if the source number can t be represented within the numeric range of the target type. As with many .NET constructs, uses of System.Convert methods may require type annotations to resolve overloading, discussed further in 5 and 6.

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