Reflection XmlSerializer, ValueType, and DataBinder are a few of the classes in the in C#

Printing PDF-417 2d barcode in C# Reflection XmlSerializer, ValueType, and DataBinder are a few of the classes in the
Reflection XmlSerializer, ValueType, and DataBinder are a few of the classes in the
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framework that use reflection for portions of their implementation as well
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Accessing Metadata Using SystemType The key to reading a type s metadata is to obtain an instance of SystemType that represents the target type instance SystemType provides all the methods for retrieving the information about a type You can use it to answer questions such as the following
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What is the type s name (TypeName) Is the type public (TypeIsPublic) What is the type s base type (TypeBaseType) Does the type support any interfaces (TypeGetInterfaces()) Which assembly is the type defined in (TypeAssembly) What are a type s properties, methods, fields, and so on (TypeGetProperties(), TypeGetMethods(), TypeGetFields(), and so on) What attributes decorate a type (TypeGetCustomAttributes())
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There are more such members, but in summary, they all provide information about a particular type The key, obviously, is to obtain a reference to a type s Type object The two primary ways to do this are through objectGetType() and typeof()
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GetType()
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object includes a GetType() member, and therefore, all types include
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this function You call GetType() to retrieve an instance of SystemType corresponding to the original object Listing 171 demonstrates this, using a Type instance from DateTime Output 171 shows the results
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Listing 171: Using TypeGetProperties() to Obtain an Object s Public Properties
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DateTime dateTime = new DateTime(); Type type = dateTimeGetType(); foreach ( SystemReflectionPropertyInfo property in typeGetProperties()) {
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17: Reflection and Attributes
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ConsoleWriteLine(propertyName); }
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OUTPUT 171:
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Date Day DayOfWeek DayOfYear Hour Kind Millisecond Minute Month Now UtcNow Second Ticks TimeOfDay Today Year
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After calling GetType(), you iterate over each SystemReflectionPropertyInfo instance returned from TypeGetProperties() and display the property names The key to calling GetType() is that you must have an object instance However, sometimes no such instance is available Static classes, for example, cannot be instantiated, so there is no way to call GetType()
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typeof()
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Another way to retrieve a Type object is with the typeof expression typeof binds at compile time to a particular Type instance, and it takes a type directly as a parameter Listing 172 demonstrates the use of typeof with EnumParse()
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Listing 172: Using typeof() to Create a SystemType Instance
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using SystemDiagnostics; // ThreadPriorityLevel priority; priority = (ThreadPriorityLevel)EnumParse( typeof(ThreadPriorityLevel), "Idle"); //
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Reflection EnumParse() takes a Type object identifying an enum and then converts a
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string to the specific enum value In this case, it converts "Idle" to SystemDiagnosticsThreadPriorityLevelIdle
Member Invocation The possibilities with reflection don t stop with retrieving the metadata The next step is to take the metadata and dynamically invoke the members it references Consider the possibility of defining a class to represent an application s command line The difficulty with a CommandLineInfo class such as this has to do with populating the class with the actual commandline data that started the application However, using reflection, you can map the command-line options to property names and then dynamically set the properties at runtime Listing 173 demonstrates this example
Listing 173: Dynamically Invoking a Member
using System; using SystemDiagnostics; public partial class Program { public static void Main(string[] args) { string errorMessage; CommandLineInfo commandLine = new CommandLineInfo(); if (!CommandLineHandlerTryParse( args, commandLine, out errorMessage)) { ConsoleWriteLine(errorMessage); DisplayHelp(); } if (commandLineHelp) { DisplayHelp(); } else { if (commandLinePriority != ProcessPriorityClassNormal) { // Change thread priority } }
17: Reflection and Attributes
// } private static void DisplayHelp() { // Display the command-line help } }
using System; using SystemDiagnostics; public partial class Program { private class CommandLineInfo { public bool Help { get { return _Help; } set { _Help = value; } } private bool _Help; public string Out { get { return _Out; } set { _Out = value; } } private string _Out; public ProcessPriorityClass Priority { get { return _Priority; } set { _Priority = value; } } private ProcessPriorityClass _Priority = ProcessPriorityClassNormal; } }
using System; using SystemDiagnostics; using SystemReflection; public class CommandLineHandler {
Reflection
public static void Parse(string[] args, object commandLine) { string errorMessage; if (!TryParse(args, commandLine, out errorMessage)) { throw new ApplicationException(errorMessage); } } public static bool TryParse(string[] args, object commandLine, out string errorMessage) { bool success = false; errorMessage = null; foreach (string arg in args) { string option; if (arg[0] == '/' || arg[0] == '-') { string[] optionParts = argSplit( new char[] { ':' }, 2); // Remove the slash|dash option = optionParts[0]Remove(0, 1); PropertyInfo property = commandLineGetType()GetProperty(option, BindingFlagsIgnoreCase | BindingFlagsInstance | BindingFlagsPublic); if (property != null) { if (propertyPropertyType == typeof(bool)) { // Last parameters for handling indexers propertySetValue( commandLine, true, null); success = true; } else if ( propertyPropertyType == typeof(string)) { propertySetValue( commandLine, optionParts[1], null); success = true; } else if (propertyPropertyTypeIsEnum) { try { propertySetValue(commandLine, EnumParse( typeof(ProcessPriorityClass), optionParts[1], true), null); success = true; }