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The EditableRootListBase class is the base from which collections of editable root business objects can be created. This stereotype and base class exist to support a very specific scenario where the list is data bound to a Windows Forms grid control, allowing the user to do in-place editing of the data in the grid. In that data bound grid scenario, when using a dynamic root list, all changes to data on a row in the grid are committed as soon as the user moves off that row. If the user deletes a row, the object is immediately deleted. If the user edits a value and moves up or down to another row, that change is immediately saved. This is fundamentally different from an editable root list, where the user s changes to items in the list aren t committed to the database until the UI saves the entire list. Given a CategoryList object with a collection of CategoryEdit objects, EditableRootListBase will be the base for creating that collection: [Serializable] public class CategoryList : EditableRootListBase<CategoryEdit> { } When creating a subclass, the business developer must provide the specific type of the objects the collection contains. The contained objects should be editable root objects, with one variation. Rather than implementing DataPortal_Fetch(), they will typically implement Child_Fetch() so they can be loaded into memory by the containing collection. Like BusinessListBase, EditableRootListBase inherits from BindingList<T> and so supports all the rich data binding behaviors provided by .NET. A dynamic root list will usually implement only one data access method: DataPortal_Fetch(). Again, this stereotype and base class exist to serve a very specific function; but when dynamic in-place editing of data in a Windows Forms grid is required, this is a very useful approach.

Diagnostics to determine the name of the property, is as follows: If CanReadProperty("Id") Then Return mId Else ' take appropriate action End If Notice that in this case, the name of the property is specified as literal text This reduces the maintainability of the code, but has a marginal performance benefit by avoiding the System Diagnostics call used by the previous overloads You can determine whether the performance gain is worth the maintainability loss for your particular application..

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be exposed to the end user, it makes it easier for accidental bugs or malicious back-door code to creep into your website This is why I use Session to store the principal object in PTWeb The user s credentials are validated, and the resulting principal object is placed in a Session field named CslaPrincipal On all subsequent page requests, this value is retrieved from Session and is used to set both the current Thread and HttpContext object s principals The work occurs in Globalasax, as this file contains the event handlers for all events leading up to a page being processed In this case, it is the AcquireRequestState event that is used: protected void Application_AcquireRequestState( object sender, EventArgs e) { SystemSecurityPrincipalIPrincipal principal; try { principal = (SystemSecurityPrincipalIPrincipal) HttpContextCurrent.

// consume_outattr.cs // compile with: csc /r:outattribute.dll consume_outattr.cs using System; using OutAttrClass; public class C { public static void Main() { C1 c1 = new C1(); String str = "old value"; c1.Func(out str); Console.WriteLine(str); } }; The output of Listing 10-10 is as follows:

Session["CslaPrincipal"]; } catch { principal = null; } if (principal == null) { // didn't get a principal from Session, so // set it to an unauthenticted PTPrincipal ProjectTrackerLibrarySecurityPTPrincipalLogout(); } else { // use the principal from Session CslaApplicationContextUser = principal; } } The reason for using the AcquireRequestState event, rather than the more obvious AuthenticateRequest event, is that Session isn t initialized when AuthenticateRequest is raised, but it usually is initialized when AcquireRequestState is raised The code first attempts to retrieve the principal object from Session This can result in an exception if Session doesn t exist, and so the value would end up being null Also, if this is the first page request by the user, the Session field will return null So the outcome is either a valid PTPrincipal object or null If the resulting principal value is null, PTPrincipal.

Technically, this is a misuse of the null value, which is intended to differentiate between a value that was never entered, and one that s empty. Unfortunately, we re typically left with no choice, because there s no way to put an empty date value into a date data type.

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