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It s not possible to bind directly to basic data types such as Int32 and string, so we need at least one containing class, such as WebDeveloper, shown here: public class WebDeveloper { public string FirstName { get; set; } public string LastName { get; set; } public string Email { get; set; } public string Website { get; set; } } This class contains several properties that will be used in the data binding If we have a TextBlock control and want to display the FirstName property, we first bind the Text property of the TextBlock control to the FirstName property <TextBlock x:Name="nameTextBlock" Text="{Binding FirstName}"/> This gets us halfway there The other step is to set the DataContext property of the TextBlock control to the WebDeveloper object.

names. But more commonly, the source object will be a business object, in which case the list of public properties and fields is returned.

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If we compile and run the sample, we ll receive this output: A:Foo B:Bar A:Baz The method A::Foo is nonvirtual; hence, declaring B::Foo does not affect A::Foo in any way So when we cast B to A and call A::Foo, B::Foo does not enter the picture it s a different method The A::Bar method is virtual, as is B::Bar, so when we create an instance of B, B::Bar replaces A::Bar in the v-table Casting B to A after that does not change anything: B::Bar is sitting in the v-table of the class instance, and A::Bar is gone Hence, when we call A::Bar using virtual dispatch, the usurper B::Bar is called instead Both the A::Baz and B::Baz methods are virtual, but B::Baz is marked newslot Thus, instead of replacing A::Baz in the v-table, B::Baz takes a new entry and peacefully coexists with A::Baz.

This step is necessary only when it isn t possible to set the data context in XAML, and a simple object like this is one of those cases The Binding markup extension provides support for three modes of operation: OneTime, OneWay, and TwoWay These modes of operation control how data is bound and controls the flow between the data source and user interface elements The following list describes each of these modes: OneTime: The data binding happens exactly once, meaning that any changes to the data source after the initial binding will not be reflected in the user interface..

We alter the table to add a constraint on the primary key column: ops$tkyte@ORA11GR2> alter table emp add constraint emp_pk 2 primary key(empno) 3 / Table altered.

Since A::Baz is still present in the v-table of the instance, the situation is practically (oops, almost wrote virtually ; I should watch it; we can t have puns in such a serious book) identical to the situation with A::Foo and B::Foo, except that the calls are done through the v-table The Visual Basic NET compiler likes this concept and uses it rather extensively If we don t want a virtual method to be overridden in the class descendants, we can mark it with the final flag If you try to override a final method, the loader fails and throws a TypeLoad exception Instances of unboxed value types don t have pointers to v-tables It is perfectly legal to declare the virtual methods as members of a value type, but these methods can be virtually called only from a boxed instance of the value type: class public value XXX { .

FGAC predicates applied, but for performance optimization, the actual query executed is needed in order to analyze the performance problem. There are several ways to identify the predicates applied by FGAC: Check the ACCESS and FILTER predicate section of the execution plan. Although the query text associated with the execution plan does not show the additional FGAC predicates, the additional predicates should appear in the Predicate Information section of the execution plan when DBMS_XPLAN is used to display execution plans. Use V$VPD_POLICY. The FGAC predicates applied to SQL statements currently in the library cache are visible in the V$VPD_POLICY view. Enable event 10730. Diagnostic event 10730 may be enabled, which will write additional information about the virtual private database (VPD) activity to the trace file when a 10046 SQL trace is also enabled.

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