ASP.NET Web PDF Document Viewer/Editor Control Library

<endpoint contract="Strangelights.Services.IGreetingService" binding="mexHttpBinding" address="mex"/> </service> </services> <behaviors> <serviceBehaviors> <behavior name="MyServiceTypeBehaviors" > <serviceDebug includeExceptionDetailInFaults="true" /> <serviceMetadata httpGetEnabled="true" /> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> <system.web> <compilation debug="true"/> </system.web> </configuration> To create a client for the service, you use the utility SvcUtil.exe, which has a similar purpose to the utility wsdl.exe that I discussed in the Creating Web Services section. To use SvcUtil.exe to create a proxy for your service, you need to use the following command line, taking care to adapt the URL appropriately: svcutil.exe http://localhost:1033/WCFService/Service.svc wsdl This will generate a C# proxy file that can then be compiled into a .NET assembly that can be used from F#. It will also generate a .config file, which can be used to configure any client application. Using the proxy is straightforward, once you ve added a reference to the proxy .dll file. Simply create an instance of the proxy, and call its Greet method with the appropriate arguments. Listing 10-10 shows an example of a proxy; because it is important to call the proxy s Dispose method, I have created it wrapped in the using function. Listing 10-10. Invoking the WCF Service using (new GreetingServiceClient()) (fun client -> print_endline (client.Greet("Rob")) read_line() |> ignore) Listing 10-11 is an example of a generated configuration file that has had certain things removed from it to make the sample run more smoothly. The security settings have been removed, because these can cause the example to fail if it is run on a computer disconnected from its domain controller (a common case for programmers on the move!). Also, one of the two generated endpoints has been removed so there is no need to specify an endpoint in the code.

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Listing 10-11. The Configuration File for Invoking the WCF Service <configuration> <system.serviceModel> <bindings> <wsHttpBinding> <binding name="WSHttpBinding_IGreetingService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="http://localhost:8080/service" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IGreetingService" contract="IGreetingService" name="WSHttpBinding_IGreetingService"> </endpoint> </client> </system.serviceModel> </configuration> The results of executing Listing 10-10 are as follows: Hello: Rob

day-to-day work What we will focus on over the course of the next few hundred pages is the client-side techniques and technology you ll need to create rich browser-based applications While you can use any server-side technology you want, using Ajax involves a bit of a shift In a typical Web application, server-side code renders an entire page and involves an entire unit of work With Ajax, you might return only a small bit of text and might involve only a small subset of a business application For most experienced Web developers, this won t be much of an issue, but it s something you need to keep in mind Emerging frameworks will help shield developers from some of the ins and outs of Ajax; however, you will need some familiarity with JavaScript We know that JavaScript can be a real pain to use.

I Caution Although removing security settings is great for getting examples to run smoothly, security is an important aspect that you should consider carefully throughout the development life cycle. If you are involved in serious WCF development, I strongly recommend that you look at the appropriate security settings for your application (for example, what kind of authentication do you want your users to provide ) as soon as possible. For further information about WCF security, please see http://strangelights.com/FSharp/ Foundations/default.aspx/FSharpFoundations.WCFSecurity.

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Sorry, there s really no getting around it Most of us learned to use alerts as a type of system out for debugging purposes, and sadly this technique is still widely used However, we have new hammers in our toolkit Along with JavaScript, you will need some familiarity with other presentation-related technologies such as HTML, the DOM, and CSS You don t need to be an expert, but you need to know the basics We ll cover most of what you need to know in this book and supplement the text with various Web resources For the test driven among us (you do write unit tests, right ), we will cover JsUnit and Selenium (see Figure 1-8) These tools allow you to develop your JavaScript test first and check for browser compatibility testing.

To me, the most exciting aspect of WCF is the ability to host a service in any program without the need for a web server. One possibility this opens up is the ability to create services whose implementation can be changed dynamically because they are hosted in fsi.exe. Although it is necessary to make some modifications to the previous sample to get it running in fsi.exe, these modification are surprisingly straightforward. Listing 10-12 shows a modified version of the previous example, Listing 10-8, designed to run in fsi.exe. Listing 10-12. A Service Designed to be Hosted in F# Interactive #light #I @"C:\Program Files\Reference Assemblies\Microsoft\Framework\v3.0";; #r "System.ServiceModel.dll";; open System open System.ServiceModel open System.Runtime.Serialization let mutable f = (fun x -> "Hello: " + x) f <- (fun x -> "Bonjour: " + x) f <- (fun x -> "Goedendag: " + x) [<ServiceContract (Namespace = "http://strangelights.com/FSharp/Foundations/WCFServices")>] type IGreetingService = interface [<OperationContract>] abstract Greet : name:string -> string end

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