barcode scanner in asp.net web application C HAPTE R 6 BUSINES S FRAM EWORK IMPLEMENTA TION in C#.net

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In addition to supporting these methods, the XMLHttpRequest object supports a number of properties, as listed in Table 1-1.

JSON is very easy to construct and has the advantage that JavaScript frameworks understand JSON objects, allowing you to easily access properties with code like this: alert(Film.Title); JSON is also a lot less verbose than a typical SOAP request, which might look like this: < xml version="1.0" encoding="utf-8" > <soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"> <soap:Body> <AddFilm xmlns="http://tempuri.org/"> <objFilm> <FilmID>1</FilmID> <Title>Kung Fu Panda</Title> </objFilm> </AddFilm> </soap:Body> </soap:Envelope> Currently, JSON support in .NET is a bit limited (although expect this to be an area Microsoft develops in the future). The ASP.NET MVC framework, however, has a special action type for working with the JSON requests you will use in the next example. Let's see how to submit a form using JQuery. 1. 2. Right-click the Views folder and add a loosely typed view called EditJSON. Replace the Content2 place holder with the following code: <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <script> function submit() { //Get values from form var InputFilmID = $("#FilmID").val(); var InputTitle = $("#Title").val(); var InputDescription = $("#Description").val(); //Submit client side $.ajax({ type: "POST", dataType: "json", url: "EditJSON",

Listing 2-5. Implementation of the Class AddressTableService using using using using using using System; System.Collections.Generic; System.Linq; System.Web; System.Data.Services.Client; System.Configuration; CloudTableStorageService_WebRole.CloudTableStorageDataService Microsoft.Samples.ServiceHosting.StorageClient; CloudTableStorageService_WebRole.CloudTableStrorageDataEntity; CloudTableStorageService_WebRole.CloudTableStorageDataContext;

A slightly more complex variation is where the rule method needs extra information beyond that provided by the basic RuleArgs parameter. In these cases, the RuleArgs class must be subclassed to create a new object that adds the extra information. A rule method to enforce a maximum length on a string, for instance, requires the maximum length value.

You saw earlier that interface implementations can be inherited from base classes. But an interface itself can inherit from one or more other interfaces. To specify that an interface should inherit from other interfaces, place the names of the base interfaces in a comma-separated list after a colon, following the interface name in the interface declaration, as follows: Colon Base interface list interface IDataIO : IDataRetrieve, IDataStore, IDataRestore { ... Unlike a class, which can only have a single class name in its base class list, an interface can have any number of interfaces in its base interface list. The interfaces in the list can themselves have inherited interfaces. The resulting interface contains all the members it declares, as well as all those of its base interfaces. The code in Figure 17-10 shows the declaration of three interfaces. Interface IDataIO is derived from the first two. The figure on the right shows IDataIO encompassing the other two interfaces.

Notice the parameter EXTERNAL_TABLE passed to SQL*Loader. It causes SQL*Loader, in this case, to not load data, but rather to generate a CREATE TABLE statement for us in the log file. This CREATE TABLE statement looked as follows (this is an abridged form; I ve edited out repetitive elements to make the example smaller): CREATE TABLE "SYS_SQLLDR_X_EXT_BIG_TABLE" ( "ID" NUMBER, ... "EDITION_NAME" VARCHAR2(30) ) ORGANIZATION external ( TYPE oracle_loader DEFAULT DIRECTORY my_dir ACCESS PARAMETERS ( RECORDS DELIMITED BY NEWLINE CHARACTERSET US7ASCII BADFILE "SYS_SQLLDR_XT_TMPDIR_00001":"big_table.bad" LOGFILE "big_table.log_xt" READSIZE 1048576 FIELDS TERMINATED BY "|" LDRTRIM REJECT ROWS WITH ALL NULL FIELDS ( "ID" CHAR(255) TERMINATED BY "|", ... "EDITION_NAME" CHAR(255) TERMINATED BY "|" ) ) location (

The metadata streams #~ and #- begin with the header described in Table 5-5. Table 5-5. Metadata Table Stream Header Structure