Using Reflection with Generic Types in Visual C#

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Listing 146 Using Reflection with Generic Types
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using System; using SystemCollectionsGeneric; Stack<int> s = new Stack<int>(); Type t = sGetType(); foreach(Type types in tGetGenericArguments()) { SystemConsoleWriteLine( "Type parameter: " + typesFullName); }
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Output 144
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Type parameter SystemInt32
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Attributes
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Before delving into details on how to program attributes, you should consider a use case that demonstrates its utility In the CommandLineHandler example in Listing 143, you dynamically set a class's properties based on the command-line option matching the property name This approach is insufficient, however, when the command-line option is an invalid property name / , for example, cannot be supported Furthermore, this mechanism doesn't provide any way of identifying which options are required versus which are optional Instead of relying on an exact match between the option name and the property name, attributes provide a way of identifying additional metadata about the decorated constructin this case, the option that the attribute decorates With attributes, you can decorate a property as Required and provide a / option alias In other words, attributes are a means of associating additional data with a property (and other constructs) Attributes appear within square brackets preceding the construct they decorate For example, you can modify the CommandLineInfo class to include attributes as shown in Listing 147
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Listing 147 Decorating a Property with an Attribute
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class CommandLineInfo { [CommandLineSwitchAlias (" ")] public bool Help { get { return _Help; } set { _Help = value; } } private bool _Help; [CommandLineSwitchRequired] public string Out { get { return _Out; } set { _Out = value; } } private string _Out; public SystemDiagnosticsProcessPriorityClass Priority { get { return _Priority; } set { _Priority = value; } } private SystemDiagnosticsProcessPriorityClass _Priority = SystemDiagnosticsProcessPriorityClassNormal; }
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In Listing 147, the Help and Out properties are decorated with attributes The purpose of these attributes is to allow an alias of / for /Help, and to indicate that /Out is a required parameter The idea is that from within the CommandLineHandlerTryParse() method, you enable support for option
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aliases and, assuming the parsing was successful, you can check that all the required switches were specified There are two ways to combine attributes on the same construct You can either separate the attributes with commas within the same square brackets, or place each attribute within its own square brackets, as shown in Listing 148
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Listing 148 Decorating a Property with Multiple Attributes
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[CommandLineSwitchRequired] [CommandLineSwitchAlias("FileName")] public string Out { get { return _Out; } set { _Out = value; } } [CommandLineSwitchRequired, CommandLineSwitchAlias("FileName")] public string Out { get { return _Out; } set { _Out = value; } }
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In addition to decorating properties, developers can use attributes to decorate classes, interfaces, structs, enums, delegates, events, methods, constructors, fields, parameters, return values, assemblies, type parameters, and modules For the majority of these, applying an attribute involves the same square bracket syntax shown in Listing 148 However, this syntax doesn't work for return values, assemblies, and modules Assembly attributes are used to add additional metadata about the assembly Visual Studio's Project Wizard, for example, generates an AssemblyInfocs file that includes a host of attributes about the assembly Listing 149 is an example of such a file
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Listing 149 Assembly Attributes within AssemblyInfocs
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using SystemReflection; using SystemRuntimeCompilerServices; using SystemRuntimeInteropServices; // General information about an assembly is controlled // through the following set of attributes Change these // attribute values to modify the information // associated with an assembly [assembly: AssemblyTitle("CompressionLibrary")] [assembly: AssemblyDescription("")] [assembly: AssemblyConfiguration("")] [assembly: AssemblyCompany("Michaelisnet")] [assembly: AssemblyProduct("CompressionLibrary")] [assembly: AssemblyCopyright("Copyright Michaelisnet 2006")] [assembly: AssemblyTrademark("")] [assembly: AssemblyCulture("")] // Setting ComVisible to false makes the types in this // assembly not visible to COM components If you need to // access a type in this assembly from COM, set the ComVisible // attribute to true on that type [assembly ComVisible(false)] // The following GUID is for the ID of the typelib if this // project is exposed to COM [assembly Guid("417a9609-24ae-4323-b1d6-cef0f87a42c3")] // Version information for an assembly consists // of the following four values: // // Major Version // Minor Version // Build Number // Revision // // You can specify all the values or you can // default the Revision and Build Numbers // by using the '*' as shown below: [assembly AssemblyVersion("1000")] [assembly AssemblyFileVersion("1000")]
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The assembly attributes define things like company, product, and assembly version number Similar to assembly , identifying an attribute usage as module requires prefixing it with module The restriction on assembly and module attributes is that they appear after the using directive but before any namespace or class declarations Return attributes, such as the one shown in Listing 1410, appear before a method declaration but use the same type of syntax structure
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