ssrs code 39

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Raises an error that halts the transformation. The first argument, if supplied, identifies the error; if it s not supplied (there s no argument or the first argument is an empty sequence), it defaults to the qualified name {http://www.w3.org/2004/07/xqt-errors}FOER0000. The first argument may be mapped to a URL in the form namespaceURI#localName by a processor. The second argument is a description of the error, and the third argument supplies additional items that provide information about the error.

[ServiceContract] public interface IRegistrationService { [OperationContract, WebGet] void Register(string uri); [OperationContract, WebGet] void Unregister(string uri); }

error() error(xs:QName) error(xs:QName , xs:string) error(xs:QName , xs:string, item()*)

The tag s TLD entry follows:

escape-uri()

<tag> <name>href</name> <tagclass>com.portalbook.forums.tags.HrefTag</tagclass> <bodycontent>NONE</bodycontent> <info> Rewrite a relative URL so that it refers to the position in the page relative to the portlet (this will remove any path information donated by the portal to manage the portlet's state). </info> <attribute> <name>path</name> <required>true</required> <rtexprvalue>true</rtexprvalue> </attribute> </tag>

Note how you defined two operations for the service to perform: Register new Windows Phone 7 clients for push notifications and Unregister them. Now it s time to add the implementation of the Register and Unregister methods. 5. Double-click the RegistrationService.cs file that Visual Studio added to your project. Make the RegistrationService.cs file look like the code here.

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Returns the string specified by the first argument with those characters that are significant in URIs escaped. The second argument should be true if the string will be used to form only part of a URI (such as a search parameter), and false if the string is a whole URI. If the first argument is an empty sequence, returns an empty string. xs:string escape-uri(xs:string , xs:boolean) See also resolve-uri(). From XPath 2.0.

exactly-one()

13

Returns the argument if and only if it contains exactly one item; otherwise raises an error. item() exactly-one(item()*) See also exists(), zero-or-one(), one-or-more(). From XPath 2.0.

public class RegistrationService : IRegistrationService { private static List<Uri> subscribers = new List<Uri>(); private static object obj = new object(); public void Register(string uri) { Uri channelUri = new Uri(uri, UriKind.Absolute); Subscribe(channelUri); } public void Unregister(string uri) { Uri channelUri = new Uri(uri, UriKind.Absolute); Unsubscribe(channelUri); } private void Subscribe(Uri channelUri) { lock (obj) { if (!subscribers.Exists((u) => u == channelUri)) { subscribers.Add(channelUri); } } } public static void Unsubscribe(Uri channelUri) { lock (obj) { subscribers.Remove(channelUri); } } public static List<Uri> GetSubscribers() { return subscribers; } } Take a look closer look at the code that you just added to the RegistrationService.cs file. Notice that the RegistrationService class implements the IRegistrationService interface on the very first line this is important! Aside from that, the code is pretty straightforward: a collection of push notification URIs is maintained in the static subscribers variable, and every client that calls the Register method of the service gets added to that list of subscribers. The lock function is used to prevent multiple

Note that we have flagged that the tag requires the path field (there s no point using the tag without specifying a path to rewrite), that it does not process any body content, and that it should permit the evaluation of runtime expressions for the path attribute, allowing the following sort of invocation:

exists()

Returns true if the argument is not an empty sequence; otherwise returns false. xs:boolean exists(item()*) See also empty(), boolean(), exactly-one(), one-or-more(). From XPath 2.0.

This last point is essential, since we are adapting an existing application, which may well generate paths for resources at runtime. By permitting runtime evaluation of the path attribute, we enable the generated path to be used directly.

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