Xml and webservice
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The document discusses XML, web services, and the System.Web.Services namespace in .NET. XML is a markup language used to store and transport data, and was designed to be self-descriptive. Web services use XML, SOAP, and WSDL to enable modular applications across companies. The System.Web.Services namespace contains classes for creating XML web services in ASP.NET like WebMethodAttribute and WebService, and consuming web services.
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A Web service is a software application that can be accessed over the web by other software applications using standard internet protocols like HTTP. Web services use XML and SOAP to exchange data over HTTP. In the .NET framework, a Web service is implemented as a normal class with public methods. The class is defined in a file with an .asmx extension. When a client calls a method on the Web service, SOAP messages are used to exchange XML data between the client and service over HTTP.
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This document discusses creating consumable web services for mobile devices. It covers understanding web services and common web service languages like XML and JSON. XML is useful for describing structured data but can be verbose. JSON is more lightweight. The document also discusses encoding binary data like images for transmission using Base64 encoding which increases file size and processing overhead.
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Xml and webservice
- 1. Xml and webservice By miss saba sumreen
- 2. xml • XML is a software- and hardware-independent tool for storing and transporting data. • What is XML? • XML stands for eXtensible Markup Language • XML is a markup language much like HTML • XML was designed to store and transport data • XML was designed to be self-descriptive • XML is a W3C Recommendation
- 3. • <hasnanin> • <hobby>kch nhi</hobby> • <profession>kch n</profession> • </hasnain>
- 14. System.Web.Services Namespace • The System.Web.Services namespace consists of the classes that enable you to create XML Web services using ASP.NET and XML Web service clients. XML Web services are applications that provide the ability to exchange messages in a loosely coupled environment using standard protocols such as HTTP, XML, XSD, SOAP, and WSDL. XML Web services enable the building of modular applications within and across companies in heterogeneous environments
- 15. Classes Class Description WebMethodAttribute Adding this attribute to a method within an XML Web service created using ASP.NET makes the method callable from remote Web clients. This class cannot be inherited. WebService Defines the optional base class for XML Web services, which provides direct access to common ASP.NET objects, such as application and session state. WebServiceAttribute Used to add additional information to an XML Web service, such as a string describing its functionality. WebServiceBindingAttribu te Declares a binding that defines one or more XML Web service methods. This class cannot be inherited.
- 16. Important points • hTTP is a widely used protocl by the web service. • SOAP message in the form of XML format • There are three aspect of developing web service development. o creating the web service o creating a proxy o consuming the web service Web service extension is .asmx If a method needs to expose to a client that should be declare with [web method] attribute. And the method must be public • .
- 17. • public class my1stwebservice : System.Web.Services.WebService • { • [WebMethod (Description="this method for multplication")] • public int multiplication(int a,int b) • { • return (a*b); • } • [WebMethod(Description="this method for sum")] • public int sum(int a, int b) • { • return (a + b); • } • [WebMethod] • public int minus(int a, int b) • { • return (a - b); • } • }