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When you take advantage of the NET features described in this chapter the memory management, the use of assemblies, type-safety, and so on the runtime is said to manage your code execution This is often referred to as managed execution Your code is said to be managed code Everything you do in this book is managed code However, NET supports unmanaged execution as well You can choose to go off the managed reservation and do your own thing with memory pointers, native Windows API calls, and explicit memory management Using unmanaged code is a risky business The nice and shiny NET managed features are there to make your life simpler and your code better But if you need the absolute highest performance, or if you need to access a custom hardware device or some legacy C or C++ code in an old DLL, then unmanaged code can be useful.

Obviously, people can resist this trend and make UI-focused design work, but it takes a great deal of discipline. The reality is that a lot of great applications end up crippled because this technique is used.

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I mention unmanaged code for completeness; it is a term you will often see in descriptions of NET I don t explain how to use unmanaged code in this book since it is a very advanced topic which is prone to creating errors and bugs For your purposes, what s interesting about the unmanaged support is that it is used extensively in the NET Framework Class Library to create some very rich features that you can use in managed code For example, the classes responsible for networking in the library have to work extensively with the native networking features of Windows These are C APIs that don t offer the convenience and protection of the managed features The NET classes act as wrappers around this functionality and, in effect, act as mediators between the happy world of managed code and the minefield of unmanaged code.

Using multiple AppDomains isn t as simple as it seems, but once explained, you ll see it s logical and understandable As an illustration, let s look at a banking example Don t concern yourself too much with the logic of the banking application, as that will be discussed in the section Micro-Kernel Pattern The banking application requires servers, as the servers implement accounts The client doesn t interface with server-based accounts directly, but interacts with an interface or an abstract base class The definitions that are implemented by the servers are as follows: public abstract class Account { } public interface IAccount { } For the time being, accept that there are two definitions that serve the same purpose, but are defined using either an abstract class or interface.

(As an aside, I cover the NET support for networking in 21)..

So, let s create an empty table: ops$tkyte%ORA11GR2> create table t 2 as 3 select * 4 from all_objects 5 where 1=0; Table created. And now we ll query it, with AUTOTRACE enabled in SQL*Plus to measure the I/O.

C() { Console::WriteLine(name); } void Print() { Console::WriteLine(name); } }; int main() { C^ c = gcnew C(); c->Print(); } You can use literal values (e.g., 100 or 'a'), string literals, compile-time constants, and previously defined literal fields in the initialization of literal fields. Literal fields are not static; do not use the keyword static for them. However, because they are not instance data, they may be accessed through the class like a static field, as in Listing 6-5. Listing 6-5. Accessing Literals // literal_public.cpp using namespace System; ref class C { public: literal String^ name = "Bob"; C() { Console::WriteLine(name); } void Print() { Console::WriteLine(name); } };

The implementation of either definition is as follows: internal class AbstractClassImpl : Account { } internal class InterfaceImpl : IAccount { } The objective of the dynamic dispatcher architecture is to be able to instantiate the types AbstractClassImpl or InterfaceImpl, and get in return the types Account or IAccount, respectively The interfaces are defined in the definitionsdll assembly, and the implementations are defined in the implementationsdll assembly In simple terms, the way to instantiate the types is to create a new AppDomain using the method AppDomainCreateDomain, and then instantiate the type using the method AppDomain CreateInstanceAndUnwrap Returned is a proxy instance to an object that is executing in another AppDomain What is a gotcha with AppDomains is the metadata The definitionsdll assembly defines the interface metadata and needs to be loaded in the new and original AppDomains The implementations.

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