Then I created an implementation for the API in a Rails controller like so:<\/p>\n
\r\nrequire 'date'\r\nclass WsTstController < ApplicationController\r\nwsdl_service_name 'WsTst'\r\nweb_service_api WsTstApi\r\nweb_service_scaffold :invoke\r\n\r\ndef get_time\r\nreturn DateTime.now.strftime(\"%H:%M:%S\")\r\nend\r\n\r\nend\r\n<\/pre>\nThis allowed Rails to generate the following WSDL (abbreviated for clarity) when calling the when requested through http:\/\/***mywebservicedomain***\/ws_tst\/service.wsdl:<\/p>\n
\r\n<definitions name=\"WsTst\" xmlns:typens=\"urn:ActionWebService\" ...>\r\n\r\n<message name=\"GetTime\"\/>\r\n<message name=\"GetTimeResponse\">\r\n<part name=\"return\" type=\"xsd:string\"\/>\r\n<\/message>\r\n\r\n<portType name=\"WsTstWsTstPort\">\r\n\r\n<operation name=\"GetTime\">\r\n<input message=\"typens:GetTime\"\/>\r\n<output message=\"typens:GetTimeResponse\"\/>\r\n<\/operation>\r\n\r\n<\/portType>\r\n\r\n<binding name=\"WsTstWsTstBinding\" type=\"typens:WsTstWsTstPort\">\r\n<soap:binding transport=\"http:\/\/schemas.xmlsoap.org\/soap\/http\" style=\"rpc\"\/>\r\n\r\n<operation name=\"GetTime\">\r\n<soap:operation soapAction=\"\/ws_tst\/api\/GetTime\"\/>\r\n\r\n<input>\r\n<soap:body namespace=\"urn:ActionWebService\" use=\"encoded\" encodingStyle=\"http:\/\/schemas.xmlsoap.org\/soap\/encoding\/\"\/>\r\n<\/input>\r\n\r\n<output>\r\n<soap:body namespace=\"urn:ActionWebService\" use=\"encoded\" encodingStyle=\"http:\/\/schemas.xmlsoap.org\/soap\/encoding\/\"\/>\r\n<\/output>\r\n\r\n<\/operation>\r\n\r\n<\/binding>\r\n\r\n<service name=\"WsTstService\">\r\n<port name=\"WsTstWsTstPort\" binding=\"typens:WsTstWsTstBinding\">\r\n<soap:address location=\"http:\/\/***mywebservicedomain***\/ws_tst\/api\"\/>\r\n<\/port>\r\n<\/service>\r\n<\/definitions>\r\n<\/pre>\nI then created a Silverlight project and added a service reference to http:\/\/***mywebservicedomain***\/ws_tst\/service.wsdl to generate the web service proxy.
\nHowever, it seemed like Visual Studio only knew how to generate a proxy assuming a WCF scenario as opposed to a Silverlight-specific WCF stack. This unfortunately generated an serialization attribute (below the statement with the OperationContractAttribute) such as:<\/p>\n\r\n[System.ServiceModel.XmlSerializerFormatAttribute(Style=System.ServiceModel.OperationFormatStyle.Rpc, Use=System.ServiceModel.OperationFormatUse.Encoded)]\r\n<\/pre>\nThe Silverlight ServiceModel library did not implement the XML serializer feature or offer any alternatives.
\nI tried to comment those out and play around with a different set of attributes but at the end of the day I could not set the serialization to be XML RPC-based.
\nMicrosoft indicated at the time in the Silverlight forums that WSI compatibility would be implemented in beta 2.<\/p>\nWell now the wait is over. So this morning I started a brand new Silverlight 2 project. I added my service reference and looked at the generated proxy. Same problem! The XmlSerializerFormatAttribute is not implemented. So I went back to MSDN to look at the new beta 2 documentation for ServiceModel. And oh surprise, there is now an equivalent feature called DataContractFormatAttribute. I replaced the name and rebuilt. Well it seems that the Use property is not implemented so I removed it. So now my full web service proxy decoration looks like this:<\/p>\n
\r\n[System.ServiceModel.OperationContractAttribute(AsyncPattern=true, Action=\"\/ws_tst\/api\/GetTime\", ReplyAction=\"*\")]\r\n[System.ServiceModel.DataContractFormatAttribute (Style=System.ServiceModel.OperationFormatStyle.Rpc)]\r\nSystem.IAsyncResult BeginGetTime(System.AsyncCallback callback, object asyncState);\r\n\r\n[return: System.ServiceModel.MessageParameterAttribute(Name=\"return\")]\r\nstring EndGetTime(System.IAsyncResult result);\r\n<\/pre>\nThe solution now built successfully. I modified added a button and a text box to my Page.xaml, then implemented the button click handler to do the following:
\n1. Instantiate the generated SOAP port client
\n2. Subscribe to the asynchronous web service call response event
\n3. Call the web service asynchronously<\/p>\nThe code looks like this:<\/p>\n
\r\nprivate void btnTest_Click(object sender, RoutedEventArgs e)\r\n{\r\nbtnTest.IsEnabled = false; \/\/ Disable the button while the web service call is in progress\r\nWsTstWsTstPortClient client = new WsTstWsTstPortClient();\r\ntry\r\n{\r\nclient.GetTimeCompleted += new EventHandler<GetTimeCompletedEventArgs>(client_GetTimeCompleted);\r\nclient.GetTimeAsync();\r\ntxtResults.Text = \"Calling web svc ...\";\r\n}\r\ncatch (Exception ex)\r\n{\r\ntxtResults.Text = string.Format(\"Error calling web svc: {0}\", ex.ToString());\r\n}\r\n}\r\n<\/pre>\nI then implemented the web service response event handler so that it gets the Result value from the web service response as follows:<\/p>\n
\r\nvoid client_GetTimeCompleted(object sender, GetTimeCompletedEventArgs e)\r\n{\r\nstring results = string.Empty;\r\n\r\ntry\r\n{\r\nresults = (e == null)\r\n? \"Received null response!\"\r\n: ((e.Result == null)\r\n? \"Received some data but Result is null!\"\r\n: e.Result);\r\n}\r\ncatch (Exception ex)\r\n{\r\nresults = string.Format(\"Error: {0}\", ex.ToString());\r\n}\r\n\r\ntxtResults.Text = string.Format(\"Web svc call completed at: {0}nResults: [{1}]\",\r\nDateTime.Now.ToString(),\r\nresults);\r\nbtnTest.IsEnabled = true;\r\n}\r\n<\/pre>\n
![\"Silverlight](\"https:\/\/blog.monnet-usa.com\/wp-content\/uploads\/2008\/06\/sl2rorws.Png\")
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