Build a Currency Converter with jQuery Mobile and. To discover the reasoning behind using. Metadata Exchange By default. Selection from Programming WCF Services, 3rd Edition. Enabling metadata exchange behavior using a config file <system. Windows Communication Foundation Services and WCF Data Services in Visual Studio. This topic provides an introduction to services from a Visual Studio perspective. For the full documentation, see WCF Data Services 4. Windows Communication Foundation (WCF) is a unified framework for creating secure, reliable, transacted, and interoperable distributed applications. Currency Converter Using Wcf ServiceIt replaces older interprocess communication technologies such as ASMX Web services, . NET Remoting, Enterprise Services (DCOM), and MSMQ. WCF brings together the functionality of all those technologies under a unified programming model. This simplifies the experience of developing distributed applications. What are WCF Data Services. WCF Data Services is an implementation of the Open Data (OData) Protocol standard. On the server side, WCF Data Services are being superseded by ASP. NET Web API for creating new OData services.
The WCF Data Services client library continues to be a good choice for consuming OData services in a . NET application from Visual Studio (Project . For more information, see WCF Data Services 4. WCF Programming Model. Currency Converter Using Wcf With MvcThe WCF Programming model is based on communication between two entities: a WCF service and a WCF client. The programming model is encapsulated in the System. Service. Model namespace in the . NET Framework. WCF Service. A WCF service is based on an interface that defines a contract between the service and the client. It is marked with a Service. Contract. Attribute attribute, as shown in the following code. In addition, you can expose serialized data by marking a composite type with a Data. Contract. Attribute attribute. This enables data binding in a client. After an interface and its methods are defined, they are encapsulated in a class that implements the interface. A single WCF service class can implement multiple service contracts. A WCF service is exposed for consumption through what is known as an endpoint. The endpoint provides the only way to communicate with the service; you cannot access the service through a direct reference as you would with other classes. An endpoint consists of an address, a binding, and a contract. The address defines where the service is located; this could be a URL, an FTP address, or a network or local path. A binding defines the way that you communicate with the service. WCF bindings provide a versatile model for specifying a protocol such as HTTP or FTP, a security mechanism such as Windows Authentication or user names and passwords, and much more. A contract includes the operations that are exposed by the WCF service class. Multiple endpoints can be exposed for a single WCF service. This enables different clients to communicate with the same service in different ways. For example, a banking service might provide one endpoint for employees and another for external customers, each using a different address, binding, and/or contract. WCF Client. A WCF client consists of a proxy that enables an application to communicate with a WCF service, and an endpoint that matches an endpoint defined for the service. The proxy is generated on the client side in the app. For services that expose multiple endpoints, the client can select the one that best fits its needs, for example, to communicate over HTTP and use Windows Authentication. After a WCF client has been created, you reference the service in your code just as you would any other object. For example, to call the Get. Data method shown earlier, you would write code that resembles the following: privatevoid button. For a walkthrough that demonstrates the tools, see Walkthrough: Creating a simple WCF Service in Windows Forms. Creating and Testing WCF Services. You can use the WCF Visual Studio templates as a foundation to quickly create your own service. You can then use WCF Service Auto Host and WCF Test Client to debug and test the service. These tools together provide a fast and convenient debug and testing cycle, and eliminate the requirement to commit to a hosting model at an early stage. WCF Templates. WCF Visual Studio templates provide a basic class structure for service development. Several WCF templates are available in the Add New Project dialog box. These include WCF Service Library projects, WCF Service Web Sites, and WCF Service Item templates. When you select a template, files are added for a service contract, a service implementation, and a service configuration. All necessary attributes are already added, creating a simple . You will, of course, want to add code to provide functions and methods for your real world service, but the templates provide the basic foundation. To learn more about WCF templates, see WCF Visual Studio Templates. WCF Service Host. When you start the Visual Studio debugger (by pressing F5) for a WCF service project, the WCF Service Host tool is automatically started to host the service locally. WCF Service Host enumerates the services in a WCF service project, loads the project. It provides a convenient service testing experience when you combine it with WCF Service Host. The tool can be found in the \Common. IDE folder, which for Visual Studio 2. C: is here: C: \Program Files (x. Microsoft Visual Studio 1. Common. 7\IDE\. When you press F5 to debug a WCF service project, WCF Test Client opens and displays a list of service endpoints that are defined in the configuration file. You can test the parameters and start the service, and repeat this process to continuously test and validate your service. To learn more about WCF Test Client, see WCF Test Client (Wcf. Test. Client. exe). Accessing WCF Services in Visual Studio. Visual Studio simplifies the task of creating WCF clients, automatically generating a proxy and an endpoint for services that you add by using the Add Service Reference dialog box. All necessary configuration information is added to the app. Most of the time, all that you have to do is instantiate the service in order to use it. The Add Service Reference dialog box enables you to enter the address for a service or to search for a service that is defined in your solution. The dialog box returns a list of services and the operations provided by those services. It also enables you to define the namespace by which you will reference the services in code. The Configure Service References dialog box enables you to customize the configuration for a service. You can change the address for a service, specify access level, asynchronous behavior, and message contract types, and configure type reuse. Some Windows Communication Foundation (WCF) services expose multiple endpoints through which a client may communicate with the service. For example, a service might expose one endpoint that uses an HTTP binding and user name / password security and a second endpoint that uses FTP and Windows Authentication. The first endpoint might be used by applications that access the service from outside a firewall, whereas the second might be used on an intranet. In such a case, you can specify the endpoint. Configuration. Name as a parameter to the constructor for a service reference. Note. Your computer might show different names or locations for some of the Visual Studio user interface elements in the following instructions. The Visual Studio edition that you have and the settings that you use determine these elements. For more information, see Personalizing the IDE. To select a service endpoint. Add a reference to a WCF service by right- clicking the project node in Solution Explorer and choosing Add service reference. In the Code Editor, add a constructor for the service reference. Service. Reference. Service. 1Client proxy = new Service. Reference. Service. Client(. . Select the endpoint. Configuration. Name As String overload. Following the overload, type =. The file will appear in the Code Editor. Search for the < Client> tag in the file. Search underneath the < Client> tag for a tag that starts with < Endpoint>. If the service reference provides multiple endpoints, there will be two or more < Endpoint tags. Inside the < End. Point> tag you will find a name=. This is the name for the endpoint that can be passed to the endpoint. Configuration. Name As String overload of a constructor for a service reference. Most methods in Windows Communication Foundation (WCF) services may be called either synchronously or asynchronously. Calling a method asynchronously enables your application to continue to work while the method is being called when it operates over a slow connection. By default, when a service reference is added to a project it is configured to call methods synchronously. You can change the behavior to call methods asynchronously by changing a setting in the Configure Service Reference dialog box. If one method for a service is called asynchronously, all methods must be called asynchronously. Note. Your computer might show different names or locations for some of the Visual Studio user interface elements in the following instructions. The Visual Studio edition that you have and the settings that you use determine these elements. For more information, see Personalizing the IDE. To call a service method asynchronously. In Solution Explorer, select the service reference. On the Project menu, click Configure Service Reference. In the Configure Service Reference dialog box, select the Generate asynchronous operations check box. You can bind data returned by a Windows Communication Foundation (WCF) service to a control just as you can bind any other data source to a control. When you add a reference to a WCF service, if the service contains composite types that return data, they are automatically added to the Data Sources window. To bind a control to single data field returned by a WCF service. On the Data menu, click Show Data Sources. The Data Sources window will appear. In the Data Sources window, expand the node for your service reference. Any composite types returned by the service will be displayed. Expand a node for a type. The data fields for that type will be displayed. ASP. NET Real- time Currency Converter using API (Google, Yahoo), Web service, and j. Query Ajax< o: p /> Google, Yahoo provides many APIs that can be used in our applications. Click here to view Available APIs from Google. Click here to view Available APIs from Yahoo. For this article I have created a web application from scratch that will pull data from Google/Yahoo and will display in user interface using j. Query Ajax and Web service. For your reference I have attached the source code with this article. Your votes , suggestions and feedback are highly appreciated to improve the quality of this and upcoming articles, please don't forget. Why it's hidden,because this API doesn't come with an official document. Once you click on the Convert button it will call a j. Query Ajax method which calls a webmethod internally. You can get the country list and codes from the attached file. By using $. ajax we are making a j. Query Ajax call to a . NET webservice. If the call is success then the currency rate will display in the result cell else the error will display. By using val() function of j. Query the html controls values are stored to a variable and that variable is passed to the Web service method. We are calling the j. Query Ajax call by the $. Query. ajax() function. I have tried to handle some of the errors in j. Query Ajax Call. The parameters are amount, from. Currency and to. Currency Convert. GOOG Web Method is used to handle the Google API call to return the currency rate. The recieved response is parsed and only the rate part is returned from this function. For your quick reference I have given the Debugging Screen shot below. So that you can see the response and the url passed from this method. The recieved response is parsed and only the rate part is returned from this function. For your quick reference I have given the Debugging Screen shot below. So that you can see the response and the url passed from this method. The expected format of the rate is a proper decimal number, if any other format (eg: 9 4.
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