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Figure 7-9. Call sequence for cross-domain access over TCP sockets All of this happens behind the scenes as far as your Silverlight code is concerned, so no specific design or code consideration is necessary on the client side for either your HTTP or sockets-based code. However, if you are also implementing the sockets-based server, you need to implement a listener on port 943 and be prepared to serve the policy file when the request comes in. The request is in the form of a special string constant of the value <policy-file-request/>.

Listing 7-28 shows a sample policy file for HTTP resource access. Listing 7-28. Sample clientaccesspolicy.xml for HTTP Access < xml version="1.0" encoding="utf-8" > <access-policy> <cross-domain-access> <policy> <allow-from http-request-headers="MyHeader, X-API-*"> <domain uri="http://subdomain1.mydomain.com"/> <domain uri="http://subdomain2.mydomain.com"/> <domain uri="http://mydomain.com:8181"/>

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</allow-from> <grant-to> <resource path="/images "/> <resource path="/services" include-subpaths="True"/> </grant-to> </policy> </cross-domain-access> </access-policy> Multiple domain entries can be used to specify specific subdomains on a root domain or nonstandard HTTP ports that are allowed to be accessed. If your domain does not have subdomains or nonstandard ports, or if you want to grant access to the entire domain regardless, include one domain entry, as shown here: <allow-from> <domain uri="*"/> </allow-from> Each resource entry specifies a resource for which access permission is granted, with the path property containing the root relative path to the resource. The optional include-subpaths defaults to False and can be left out. If you want to grant access to subpaths for a specific path as well, set includesubpaths to True, as shown in Listing 7-28. Specifying one resource entry with the path value set to / and include-subpaths set to True allows full access to all resources in the site, as shown here: <grant-to> <resource path="/" include-subpaths="True"/> </grant-to> The optional http-request-headers attribute on the allow-from element can be a commaseparated list of allowed HTTP request headers, where you can use an asterisk (*) as a part of a header name to indicate a wildcard. You can also replace the entire list and use the * wildcard to allow all possible headers. If the attribute is left out, no HTTP headers are allowed. Listing 7-29 shows a clientaccesspolicy.xml file for sockets-based access. Listing 7-29. Sample clientaccesspolicy.xml for sockets-based access < xml version="1.0" encoding ="utf-8" > <access-policy> <cross-domain-access> <policy> <allow-from> <domain uri="*" /> </allow-from> <grant-to> <socket-resource port="4502-4534" protocol="tcp" /> </grant-to> </policy>

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</cross-domain-access> </access-policy> The difference here is in the use of the socket-resource element. The socket-resource element has two attributes. The port attribute can be used to specify the range of ports allowed, where the range has to be within 4502 4534. The protocol attribute allows tcp as the only possible value in this version of Silverlight. They are both required attributes. For complete details on the policy syntax, refer to the related MSDN documentation at msdn.microsoft.com/en-us/library/cc645032(VS.95).aspx.

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{ return (this.ProductInventories == null || this.ProductInventories.Count == 0) new SolidColorBrush(Colors.Gray) : (this.ProductInventories[0].Quantity > this.SafetyStockLevel new SolidColorBrush(Colors.Green) : (this.ProductInventories[0].Quantity > this.ReorderPoint new SolidColorBrush(Colors.Yellow) : new SolidColorBrush(Colors.Red))); } set { //no actual value set here - just property change raised //can be set to null in code to cause rebinding, when //ProductInventories changes RaisePropertyChanged("InventoryLevelBrush"); } } private string _InventoryLevelMessage; public string InventoryLevelMessage { get { return (this.ProductInventories == null || this.ProductInventories.Count == 0) "Stock Level Unknown" : (this.ProductInventories[0].Quantity > this.SafetyStockLevel "In Stock" : (this.ProductInventories[0].Quantity > this.ReorderPoint "Low Stock" : "Reorder Now")); } set { //no actual value set here - just property change raised //can be set to null in code to cause rebinding, //when ProductInventories changes RaisePropertyChanged("InventoryLevelMessage"); } } } } You set the ItemsSource properties for both lbxStandard and lbxCustom to a list of Product data items obtained from the AdventureWorks WCF service, as shown in the GetData() method in Listing 5-4. You also populate inventory information for each Product instance from the same service as a collection of ProductInventory instances.

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