birt code 39

birt code 39

birt code 39

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the web. For example, it s increasingly common for people to want to be able to tell their friends on Facebook about their latest purchase. Between Facebook, Live Services, OpenID (and its differing implementations), and all the various enterprise identity-management systems, access control has now became a complex task. AppFabric ACS abstracts away the nuances of the various third-party providers by using a simple rules-based authentication service that manages authentication across multiple providers for users with multiple credentials. We ll look more closely at ACS in chapter 17 and show you how to use it in a couple of key scenarios.

Where IsSelfDirty provides the status for one object, IsDirty is often more useful because it provides the status for the object and all its child objects.

As with all base classes, this one is serializable and abstract. To support both data binding and collection behaviors, it inherits from System.ComponentModel.BindingList<T>: [Serializable()] public abstract class BusinessListBase<T, C> : System.ComponentModel.BindingList<C>, Core.IEditableCollection, ICloneable where T : BusinessListBase<T, C> where C : Core.BusinessBase { }

In the previous section, we looked at a LINQ query that included a WHERE clause, restricting the data returned from the Table service to include only those shirts in the Shirts partition. We ll now look at how you can modify your use of the REST API to perform server-side filtering.

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Notice that in addition to inheriting from BindingList<T>, this class implements Csla.Core. IEditableCollection and System.ICloneable. Also take a look at the generic type parameters, T and C. The T type is constrained, just as with Csla.BusinessBase, ensuring that T will be the type of the business collection subclassing BusinessListBase. The C type represents the type of child object contained within the collection. It is constrained to be of type Csla.Core.BusinessBase, ensuring that the collection will only contain business objects. The end result is that a business collection is declared like this: [Serializable()] public class LineItems : Csla.BusinessListBase<LineItems, LineItem> { } This indicates that the collection contains business objects defined by a LineItem class that inherits from Csla.BusinessBase<LineItem>. With this basis established, let s move on and discuss each functional area in the class.

As stated previously, the combination of the PartitionKey and RowKey uniquely identifies an entity in a table. If you wish to return a single entity from a table, and you know these two values, you can efficiently return the entity. The following URI would return the RedShirt entity from the Shirts partition:

An object is considered to be valid if it has no currently broken validation rules. The Csla.Validation namespace is covered in 11 and provides management of the business rules. The IsSelfValid property merely exposes a flag indicating whether the object currently has broken rules or not. There s also an IsValid property that reflects whether the current object, or any of its child objects, are invalid. Here s the IsSelfValid code, which returns a value for only this object, not counting its child objects: [Browsable(false)] public virtual bool IsSelfValid { get { return ValidationRules.IsValid; } } As with IsSelfDirty, this property is marked with the Browsable attribute so data binding defaults to ignoring the property. There are no methods to directly control whether an object is valid. The validity of an object is managed by the business and validation rules subsystem discussed in 11. However, this method is virtual, so it is possible to replace or extend the way CSLA .NET manages the concept of validity if you so desire.

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