open source qr code library vb.net Part III Essential Types in .NET

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Part III Essential Types
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incredibly powerful mechanism that s useful at both application design time and runtime . Anyone can define and use custom attributes, and all compilers that target the common language runtime (CLR) must be designed to recognize custom attributes and emit them into the resulting metadata . The first thing you should realize about custom attributes is that they re just a way to associate additional information with a target . The compiler emits this additional information into the managed module s metadata . Most attributes have no meaning for the compiler; the compiler simply detects the attributes in the source code and emits the corresponding metadata . The .NET Framework Class Library (FCL) defines literally hundreds of custom attributes that can be applied to items in your own source code . Here are some examples:
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Applying the DllImport attribute to a method informs the CLR that the implementation of the method is actually in unmanaged code contained in the specified DLL . Applying the Serializable attribute to a type informs the serialization formatters that an instance s fields may be serialized and deserialized . Applying the AssemblyVersion attribute to an assembly sets the version number of the assembly . Applying the Flags attribute to an enumerated type causes the enumerated type to act as a set of bit flags .
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Following is some C# code with many attributes applied to it . In C#, you apply a custom attribute to a target by placing the attribute in square brackets immediately before the target . It s not important to understand what this code does . I just want you to see what attributes look like .
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using System; using System.Runtime.InteropServices; [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] internal sealed class OSVERSIONINFO { public OSVERSIONINFO() { OSVersionInfoSize = (UInt32) Marshal.SizeOf(this); } public public public public public UInt32 UInt32 UInt32 UInt32 UInt32 OSVersionInfoSize MajorVersion MinorVersion BuildNumber PlatformId = = = = = 0; 0; 0; 0; 0;
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[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)] public String CSDVersion = null; }
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18 Custom Attributes
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internal sealed class MyClass { [DllImport("Kernel32", CharSet = CharSet.Auto, SetLastError = true)] public static extern Boolean GetVersionEx([In, Out] OSVERSIONINFO ver); }
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In this case, the StructLayout attribute is applied to the OSVERSIONINFO class, the MarshalAs attribute is applied to the CSDVersion field, the DllImport attribute is applied to the GetVersionEx method, and the In and Out attributes are applied to GetVersionEx s ver parameter . Every programming language defines the syntax a developer must use in order to apply a custom attribute to a target . Microsoft Visual Basic .NET, for example, requires angle brackets (<, >) instead of square brackets . The CLR allows attributes to be applied to just about anything that can be represented in a file s metadata . Most commonly, attributes are applied to entries in the following definition tables: TypeDef (classes, structures, enumerations, interfaces, and delegates), MethodDef (including constructors), ParamDef, FieldDef, PropertyDef, EventDef, AssemblyDef, and ModuleDef . Specifically, C# allows you to apply an attribute only to source code that defines any of the following targets: assembly, module, type (class, struct, enum, interface, delegate), field, method (including constructors), method parameter, method return value, property, event, and generic type parameter . When you re applying an attribute, C# allows you to specify a prefix specifically indicating the target the attribute applies to . The following code shows all of the possible prefixes . In many cases, if you leave out the prefix, the compiler can still determine the target an attribute applies to, as shown in the previous example . In some cases, the prefix must be specified to make your intentions clear to the compiler . The prefixes shown in italics below are mandatory .
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