Difference between revisions of "Zh/Documentation/DevGuide/ProUNO/CLI/Lifetime Management and Obtaining Interfaces"
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Latest revision as of 03:15, 14 May 2009
CLR 与 Java 运行时类似,它跟踪对象的生存期而不会将任务留给开发者。只要不再引用某对象(存取不到),CLR 就会删除该对象。因此,不需要 C++ 中所使用的引用计数。因此,不需要 com.sun.star.uno.XInterface:acquire 和 com.sun.star.uno.XInterface:release。
XInterface 有第三种方法 queryInterface,该方法用于查询特定接口的对象。此语言绑定不使用 queryInterface。相反,将会把对象强制转换成所需的接口。例如:
// C# try { XFoo bar = (XFoo) obj; } catch (System.InvalidCastException e) { // obj does not support XFoo } // using keywords is and as if (obj is XFoo) { // obj supports XFoo } XFoo foo = obj as XFoo; if (foo != null) { // obj supports XFoo } // C++ with managed extensions XFoo * pFoo = dynamic_cast< XFoo * >( obj ); if (XFoo != 0) { // obj supports XFoo } try { XFoo * pFoo = __try_cast< XFoo * >( obj ); } catch (System::InvalidCastException * e) { // obj does not support XFoo }
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