Web Services in Visual Studio .NET

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The CookieContainer property returns a collection of cookies, so you can read the cookies it contains and you can add your own cookies. In particular, you can read the special session cookie named ASP.NET_SessionId, save it in a variable or on disk, and add it to the cookies collection in a subsequent call:
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Dim saveCookie As Cookie Sub CallStatefulWebServiceMethod() Dim service As New localhost.SampleService() Make the proxy object a cookie container. service.CookieContainer = New CookieContainer() If we already have the cookie, let s add it to the cookies collection. If Not (saveCookie Is Nothing) Then service.CookieContainer.Add(saveCookie) End If Call the Web service method. Label1.Text = service.IncrementCounter() Save the cookie if this is the first call. If saveCookie Is Nothing Then Replace the argument with the actual Web service s URL. Dim cookieUri As New Uri( http://localhost ) Save the ASP.NET_SessionId cookie belonging to the localhost URI. saveCookie = service.CookieContainer.GetCookies(cookieUri).Item _ ( ASP.NET_SessionId ) End If End Sub
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This technique has two important applications. First, two Windows Forms applications can share the same session, regardless of whether they re running on the same or dif ferent client machines, as long as they have a means for exchanging the contents of the session cookie. Second, all the pages in a Web Forms ASP.NET application can invoke methods in a Web service and share the same set of session variables. (In this case, the individual .aspx pages should save the cookie in a Session or Application variable.)
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Web services methods can throw exceptions, either directly with a Throw statement or indirectly when they perform an invalid operation. When interacting with a Web ser vice, you must account for other types of errors as well, such as those caused by a cli ent using an outdated version of the WSDL contract (and of the proxy class). Whenever an error occurs while a Web service is processing a request, the SOAP mes sage returned to the client contains a <soap:Fault> block inside its body instead of the usual <soap:Body> block. On the client side, this fault block is translated into a SoapException object, which is the type to look for in the Catch clause of the Try...End Try block. The SoapException class inherits from SystemException all the usual
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properties, to which it adds a few specific ones. The most significant members of the SoapException class are the following:
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Message is the message property of the original exception. Actor is the URL of the Web service that threw the exception. Code is an XmlQualifiedName object that specifies the SOAP fault code that describes the general cause of the error. Detail is an XmlNode object representing application-specific error information. This property is set only if the error occurred when the Web service was process ing the body of the message and is Nothing in other cases (such as when the prob lem was in the header or in the format of the message).
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Most of the time, the properties you should focus your attention on are Message and Code. A minor problem is that the original error string is buried inside the value returned by the Message property. For example, if the Web service method throws a NullReferenceException, this is the string you ll find in the Message property:
System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.NullReferenceException: Object reference not set to an instance of an object. at MoneyConverter.SampleService.ThrowAnException() --- End of inner exception stack trace ---
The simplest way to extract the name of the real exception is to use regular expres sions. Here s a reusable routine that does the job:
Extract the name of the inner exception. Function GetWSException(ByVal ex As SoapException) As String Parse the exception s Message property. Dim mc As MatchCollection = Regex.Matches(ex.Message, ---> ([^:]+): ) If mc.Count >= 1 Then We ve found a match - the first group contains the value. Return mc.Item(0).Groups(1).Value End If End Function
You can use the GetWSException function inside a Try End Try block that uses a When clause, as follows:
Try Dim service As New localhost.SampleService() service.ThrowAnException() Catch ex As SoapException _ When GetWSException(ex) = System.NullReferenceException" A null reference exception Catch ex As SoapException _ When GetWSException(ex) = System.DivideByZeroException" A divide-by-zero exception End Try
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