FILES, STREAMS, AND IO in C#

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The first byte of a signature identifies the type of the signature, which for historical reasons is called the calling convention of the signature, be it a method signature or some other signature. The CorHdr.h file defines the following calling convention constants in the enumeration CorCallingConvention: IMAGE_CEE_CS_CALLCONV_DEFAULT (0x0). Default ( normal ) method with a fixed-length argument list. ILAsm has no keyword for this calling convention. IMAGE_CEE_CS_CALLCONV_VARARG (0x5). Method with a variable-length argument list. The ILAsm keyword is vararg. IMAGE_CEE_CS_CALLCONV_FIELD (0x6). Field. ILAsm has no keyword for this calling convention. IMAGE_CEE_CS_CALLCONV_LOCAL_SIG (0x7). Local variables. ILAsm has no keyword for this calling convention.
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The next piece we re going to tackle is the custom properties for our activity. To make this activity work, we need three pieces of information: The URL of the SharePoint site that stores the ruleset documents The name of the document library on that site that stores the ruleset documents The name of the ruleset document to apply Listing 8-9 shows all of the code for the properties we ll use to capture this information. The SourceSiteURL property is the same as the properties we set up on our activity in 5 it just makes sense to use a dependency property. If you need a refresher on dependency properties, jump back to 5. Other than that, there is nothing special about this property. Listing 8-9. Setting Up Our Properties public static DependencyProperty SourceSiteURLProperty = DependencyProperty.Register("SourceSiteURL", typeof(string), typeof(KCD.Workflow.Rules.ExternalPolicy)); public string SourceSiteURL { get { return ((string)(base.GetValue( KCD.Workflow.Rules.ExternalPolicy.SourceSiteURLProperty))); }
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You can combine the values of an enum by using the C# logical operators that were described in 5. To do this, you create an enum where the numeric values assigned to each constant increase in powers of two, as shown in Listing 12-27. Listing 12-27. A Combinable Enum [Flags] public enum CarOptions { AlloyWheels = 1, CDPlayer = 2, SatNav = 4, Bluetooth = 8 } You should apply the Flags attribute when you define an enum like this; attributes are described in 17. Once you have created your enum, you can use the logical operators to combine and test enum values, as shown in Listing 12-28.
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CHAPTER 20 ENUMERATORS AND ITERATORS
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Figure 6-1. Classes and vtables Every instance of a class that has at least one virtual function contains a pointer to a vtable (vptr). When a virtual function is called via a pointer or a reference, this vtable pointer is used to determine the address of the most derived function at runtime. This implementation ensures that overrides provided by a derived class are called. However, virtual functions called on partially constructed objects are not always resolved to the most derived override. To understand this, it is necessary to discuss the construction order of native classes. Every constructor first calls its base class constructor until the root of the object hierarchy is reached. Instead of initializing the vtable pointer once to refer to the vtable of the most derived class, each base class constructor in the object hierarchy initializes the vtable pointer
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Listing 8-2 shows you how message information headers appear within a SOAP message. Listing 8-2. A SOAP Message with Message Information Headers <S:Envelope xmlns:S="http://www.w3.org/2002/12/soap-envelope" xmlns:wsa="http://schemas.xmlsoap.org/ws/2003/03/addressing" xmlns:st="http://www.bluestonepartners.com/schemas/StockTrader"> <S:Header> <wsa:MessageID>uuid:7ae86g-95d...</wsa:MessageID> <wsa:ReplyTo> <wsa:Address>http://investor123.com/client</wsa:Address> </wsa:ReplyTo> <wsa:FaultTo> <wsa:Address>http://investor123.com/faults</wsa:Address> </wsa:FaultTo> <wsa:To S:mustUnderstand="1">http://stocktrader.com/StockTrader</wsa:To> <wsa:Action>http://stocktrader.com/StockTrader#RequestQuote</wsa:Action> </S:Header> <S:Body> <st:RequestQuote> <Symbol>MSFT</Symbol> </st:RequestQuote> </S:Body> </S:Envelope> Listing 8-2 is a SOAP message that is being sent from a client at investor123.com to a stock trading service at stocktrader.com. The client is requesting a stock quote, using the RequestQuote operation. This operation is described in the StockTrader schema, as referenced in the envelope header. Note that the StockTrader schema is qualified using the XSD namespace reference http://www.bluestonepartners.com/schemas/StockTrader. This simple code listing displays the best aspect of SOAP messages: they are fully qualified and self-describing. Every element in this SOAP message is qualified by a specific XML namespace. And the addressing information for the message is self-contained. Nothing that is included in a SOAP message is allowed to exist in a vacuum.
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Six named streams can be present in the metadata: #Strings: A string heap containing the names of metadata items (class names, method names, field names, and so on). The stream does not contain literal constants defined or referenced in the methods of the module. #Blob: A blob heap containing internal metadata binary objects, such as default values, signatures, and so on. #GUID: A GUID heap containing all sorts of globally unique identifiers. #US: A blob heap containing user-defined strings. This stream contains string constants defined in the user code. The strings are kept in Unicode (UTF-16) encoding, with an additional trailing byte set to 1 or 0, indicating whether there are any characters with codes greater than 0x007F in the string. This trailing byte was added to streamline the encoding conversion operations on string objects produced from user-defined string constants. This stream s most interesting characteristic is that the user strings are never referenced from any metadata table but can be explicitly addressed by the IL code (with the ldstr instruction). In addition, being actually a blob heap, the #US heap can store not only Unicode strings but any binary object, which opens some intriguing possibilities. #~: A compressed (optimized) metadata stream. This stream contains an optimized system of metadata tables. #-: An uncompressed (unoptimized) metadata stream. This stream contains an unoptimized system of metadata tables, which includes at least one intermediate lookup table (pointer table). The streams #~ and #- are mutually exclusive that is, the metadata structure of the module is either optimized or unoptimized; it cannot be both at the same time or be something in between. If no items are stored in a stream, the stream is absent, and the iStreams field of the storage header is correspondingly reduced. At least three streams are guaranteed to be present: a metadata stream (#~ or #-), a string stream (#Strings), and a GUID stream (#GUID). Metadata items must be present in at least a minimal configuration in even the most trivial module, and these metadata items must have names and GUIDs.
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Note To increase code readability throughout this book, all ILAsm keywords within the code listings
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ne of the first mainstream uses of AJAX in web applications was mapping. AJAXenhanced maps are significantly more user friendly because they enable the user to have a much richer, smoother, and interactive experience with the maps. Mapping functionality based on Virtual Earth packaged in script files was shipped with some of the earlier beta bits of ASP.NET AJAX (also known as Atlas) but was removed from the final release of the product. Microsoft Virtual Earth, which is now part of the Windows Live family of products, provides a comprehensive SDK (available at http://dev.live.com/ virtualearth/sdk/) for developers to integrate AJAX style maps right into their web applications. This includes support for all the cool features, including 3D maps and bird s eye view (where available). In this chapter, we will examine the Virtual Earth SDK along with some of its basic functionality and discuss how you can leverage it in your own applications.
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Description
// Create the document. // Create the root element.
Visibility and Naming Conventions
Can the compilation model be used for extending existing projects with .NET features Can the assembly export functions to native clients Can the compilation model be used for wrapping native libraries
The chapter closed by defining the namespaces that contain the framework classes. This way, they re organized so that they re easily understood and used. 3 will implement the portions of the framework primarily geared toward supporting the UI and data binding. Then, 4 will implement the data portal and object persistence. 5 will wrap up loose ends by implementing the helper classes, such as SmartDate, SafeDataReader, and others. With the framework complete, the rest of the book will walk through the design and implementation of a sample application using object-oriented concepts and the CSLA .NET framework. Those chapters will explore how the framework functions and how it meets the goals set forth in this chapter.
Summary
Note This code example uses Windows Communication Foundation to contact an application server and have it instantiate an object on the server. In 15, you ll see how CSLA .NET abstracts this code into a much simpler form, effectively wrapping and hiding the complexity of WCF.
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