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Table 7-5 shows the different macros and their values depending on the compilation model: Table 7-5. Predefined Macros for Managed Code
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.assembly extern mscorlib { auto } defines a metadata item named Assembly Reference (or AssemblyRef), identifying the external managed application (assembly) used in this program. In this case, the external application is Mscorlib.dll, the main assembly of the .NET Framework classes. (The topic of the .NET Framework class library itself is beyond the scope of this book; for further information, consult the detailed specification of the .NET Framework class library published as Partition IV of the Ecma International/ISO standard.) The Mscorlib.dll assembly contains declarations of all the base classes from which all other classes are derived. Although theoretically you could write an application that never uses anything from Mscorlib.dll, I doubt that such an application would be of any use. (One obvious exception is Mscorlib.dll itself.) Thus, it s a good habit to begin a program in ILAsm with a declaration of AssemblyRef to Mscorlib.dll, followed by declarations of other AssemblyRefs (if any). The scope of an AssemblyRef declaration (between the curly braces) can contain additional information identifying the referenced assembly, such as the version or culture (previously known as locale). Because this information is not relevant to understanding this sample, I have omitted it here. ( 5 describes this additional information in detail.) Instead, I used the keyword auto, which prompts ILASM to automatically discover the latest version of the referenced assembly. Note that the assembly autodetection feature is specific to ILASM 2.0 and newer. Versions 1.0 and 1.1 have no autodetection, but they allow referencing Mscorlib.dll (and only it) without additional identifying information. So when using older versions of ILASM, just leave the AssemblyRef scope empty. Note also that although the code references the assembly Mscorlib.dll, AssemblyRef is declared by filename only, without the extension. Including the extension causes the loader to look for Mscorlib.dll.dll or Mscorlib.dll.exe, resulting in a run-time error. .assembly OddOrEven { } defines a metadata item named Assembly, which, to no one s surprise, identifies the current application (assembly). Again, you could include additional information identifying the assembly in the assembly declaration see 6 for details but it is not necessary here. Like AssemblyRef, the assembly is identified by its filename, without the extension. Why do you need to identify the application as an assembly If you don t, it will not be an application at all; rather, it will be a nonprime module part of some other application (assembly) and as such will not be able to execute on its own. Giving the module an .exe extension changes nothing; only assemblies can be executed. .module OddOrEven.exe defines a metadata item named Module, identifying the current module. Each module, prime or otherwise, carries this identification in its metadata. Note that the module is identified by its full filename, including the extension. The path, however, must not be included.
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First, you ll need to load a model, together with a custom effect with which you want to render the model. Both should be loaded using the content pipeline: protected override void LoadContent(bool loadAllContent) { if (loadAllContent) { device = graphics.GraphicsDevice; basicEffect = new BasicEffect(device, null); myModel = content.Load<Model>("forklift"); modelTransforms = new Matrix[myModel.Bones.Count]; customEffect = content.Load<Effect>("bwcolor"); } } The simple custom effect in this example will render the model using grayscale values. Because the effects are stored in the ModelMeshes of a Model, you can easily overwrite them with your custom effect. However, all information held in the original effect will be lost! Such information includes textures and material color information. Before overwriting the default effect of the model, you ll want to store this information, because your custom effect will need to know, for example, which textures to use. You will create a method that takes in a Model and a custom effect. It will replace all effects in the model with copies of your custom effect. Finally, to demonstrate how to store the original data, the method will return an array of all textures used by the original effects, so you can feed them to your own effect. In this example, all effects are overridden by your custom effect, but a small adaptation suffices to override only the effect of a particular ModelMeshPart: private Texture2D[] ChangeEffect(ref Model model, Effect newEffect) { }
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Silverlight exists in a connected world. Its network support is primarily focused on communication over HTTP(S), which enables it to easily invoke services on the World Wide Web and download documents such as syndication feeds. In this chapter, you ve learned about the support for HTTP(S) communication provided by the WebClient and HttpWebRequest classes. Silverlight also supports raw socket communication, albeit with severe restrictions. The support for UDP multicast opens up many avenues to effectively implement video conferencing and video gaming applications with the use of network resources. The next chapter will utilize the networking support built into Silverlight to retrieve data for consumption by Silverlight.
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of the UNDO tablespace (any undo generated for that table in the CLEAR tablespace will be around), nor will it remove it from the REDO stream, and definitely not from the archived logs you have, nor the backups. It will not even remove it from TEMP where it might be recorded due to a large sort. I bring up these facts that the move leaves behind many copies of the data from before the move because many people think that if they encrypt the data, they are done and it is secured. That is just the first step when employing encryption; you have to think about all of the legacy places this data might appear and do something to secure each of those. For example, if you move one table out of a tablespace into an encrypted tablespace in order to secure it, you may well consider moving all segments out of that tablespace into other tablespaces so you can ultimately drop that tablespace and wipe (erase) the datafiles. Then you have to think about what you want to do with the data that exists in old backups. You might have to take some action with those copies as well (or maybe not; only you can decide what level you need to go to protect your data). In a later section Implementing Tablespace Encryption, we ll look at the details of how it is implemented in the Oracle database. We ll look at what restrictions tablespace encryption might impose on your application and how it might affect performance. Do not expect any hard and fast tablespace encryption will affect your performance by X% numbers. The impact of tablespace encryption on your processing requirements will vary based on how your application uses the database. Having information about how Oracle implements tablespace encryption will allow you to judge to what degree it will impact your performance.
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This allows Visual Studio to properly set up the directory as needed for ASP.NET.
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The retrieval of a child object is quite different from the retrieval of a root object, because the data portal isn t directly involved. Instead, as stated earlier, the root object s DataPortal_Fetch() method is responsible for loading not only the root object s data, but also the data for all child objects. It then calls methods on the child objects, passing the preloaded data as parameters so the child objects can load their fields with data. The sequence of events goes like this: 1. The root object s DataPortal_Fetch() creates the child collection using a static factory method on the collection class (scoped as internal), and it passes a data reader object as a parameter. 2. The child collection implements a private constructor to load its data. This method uses the data reader provided as a parameter. 3. The child collection s constructor loops through the records in the data reader, performing the following steps for each record. a. The child collection creates a child object by calling a factory method on the child class, passing the data reader as a parameter. b. The child object s factory method calls its own private constructor, passing the data reader as a parameter, to load itself with data. c. The collection object adds the child object to its collection. 4. At the end of the data reader, the child collection and all child objects are fully populated. Figure 7-5 is a sequence diagram that illustrates how this works. Note that this diagram occurs during the process of loading the root object s data. This means that this diagram is really an expansion of the previous sequence diagram for retrieving a root object!
I ve entitled this brief section Advanced Deployment only because it deals with a couple of topics that you ll find to be a next step in your deployment education. As I mentioned earlier in the chapter, your future deployment endeavors will most definitely involve multiple envi-
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