how to create barcode in vb.net 2012 Deeper Reflection in C#.NET

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Deeper Reflection
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Examples in 22 showed how to use reflection to determine the attributes attached to a class. You can also use reflection to find all the types in an assembly or dynamically locate and call functions in an assembly. You can even use it to emit the .NET intermediate language on the fly to generate code that can be executed directly. The documentation for the .NET CLR contains more details on using reflection.
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Listing All the Types in an Assembly
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The following example looks through an assembly and locates all the types in that assembly: using System; using System.Reflection; enum MyEnum { Val1, Val2, Val3 } class MyClass { } struct MyStruct { } class Test { public static void Main(String[] args) { // list all types in the assembly that is passed // in as a parameter Assembly a = Assembly.LoadFrom (args[0]); Type[] types = a.GetTypes(); // look through each type, and write out some information // about them. foreach (Type t in types) { Console.WriteLine ("Name: {0}", t.FullName); Console.WriteLine ("Namespace: {0}", t.Namespace); Console.WriteLine ("Base Class: {0}", t.BaseType.FullName); } } }
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CHAPTER 38 DEEPER INTO C#
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If this example runs, passing the name of the .exe in, it will generate the following output: Name: MyEnum Namespace: Base Class: System.Enum Name: MyClass Namespace: Base Class: System.Object Name: MyStruct Namespace: Base Class: System.ValueType Name: Test Namespace: Base Class: System.Object
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Finding Members
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This example lists the members of a type: using System; using System.Reflection; class MyClass { MyClass() {} static void Process() { } public int DoThatThing(int i, Decimal d, string[] args) { return(55); } public int value = 0; public float log = 1.0f; public static int value2 = 44; } class Test { public static void Main(String[] args) { // Iterate through the fields of the class Console.WriteLine("Fields of MyClass"); type t = typeof (MyClass); foreach (MemberInfo m in t.GetFields()) { Console.WriteLine("{0}", m); }
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CHAPTER 38 DEEPER INTO C#
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// and iterate through the methods of the class Console.WriteLine("Methods of MyClass"); foreach (MethodInfo m in t.GetMethods()) { Console.WriteLine("{0}", m); foreach (ParameterInfo p in m.GetParameters()) { Console.WriteLine(" Param: {0} {1}", p.ParameterType, p.Name); } } } } This example produces the following output: Fields of MyClass Int32 value Single log Int32 value2 Methods of MyClass Void Finalize () Int32 GetHashCode () Boolean Equals (System.Object) Param: System.Object obj System.String ToString () Void Process () Int32 DoThatThing (Int32, System.Decimal, System.String[]) Param: Int32 i Param: System.Decimal d Param: System.String[] args System.Type GetType () System.Object MemberwiseClone () For information on how to reflect over an enum, see 21. When iterating over the methods in MyClass, the standard methods from object also show up.
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Invoking Functions
In this example, reflection will open the names of all the assemblies on the command lines to search for the classes in them that implement a specific interface and then to create an instance of those classes and invoke a function on the instance. This is useful to provide a late-bound architecture, where a component can be integrated with other components runtimes. This example consists of four files. The first one defines the IProcess interface that will be searched for. The second and third files contain classes that implement this interface, and each is compiled to a separate assembly. The last file is the driver file; it opens the assemblies passed
CHAPTER 38 DEEPER INTO C#
on the command line and searches for classes that implement IProcess. When it finds one, it instantiates an instance of the class and calls the Process() function.
IProcess.cs
IProcess defines that interface that you ll search for: // file=IProcess.cs namespace MamaSoft { interface IProcess { string Process(int param); } }
process1.cs
This is the process1.cs file: // file=process1.cs // compile with: csc /target:library process1.cs iprocess.cs using System; namespace MamaSoft { class Processor1: IProcess { Processor1() {} public string Process(int param) { Console.WriteLine("In Processor1.Process(): {0}", param); return("Raise the mainsail! "); } } } This should be compiled with the following: csc /target:library process1.cs iprocess.cs
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