C Sharp Reflection

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C# Reflection

In C#, reflection is a process to get metadata of a type at runtime. The System.Reflection namespace contains required classes for reflection such as:

  • Type
  • MemberInfo
  • ConstructorInfo
  • MethodInfo
  • FieldInfo
  • PropertyInfo
  • TypeInfo
  • EventInfo
  • Module
  • Assembly
  • AssemblyName
  • Pointer etc.

The System.Reflection.Emit namespace contains classes to emit metadata.


C# Type class

C# Type class represents type declarations for class types, interface types, enumeration types, array types, value types etc. It is found in System namespace. It inherits System.Reflection.MemberInfo class.

C# Type Properties

A list of important properties of Type class are given below:

Property Description
Assembly Gets the Assembly for this type.
AssemblyQualifiedName Gets the Assembly qualified name for this type.
Attributes Gets the Attributes associated with the type.
BaseType Gets the base or parent type.
FullName Gets the fully qualified name of the type.
IsAbstract is used to check if the type is Abstract.
IsArray is used to check if the type is Array.
IsClass is used to check if the type is Class.
IsEnum is used to check if the type is Enum.
IsInterface is used to check if the type is Interface.
IsNested is used to check if the type is Nested.
IsPrimitive is used to check if the type is Primitive.
IsPointer is used to check if the type is Pointer.
IsNotPublic is used to check if the type is not Public.
IsPublic is used to check if the type is Public.
IsSealed is used to check if the type is Sealed.
IsSerializable is used to check if the type is Serializable.
MemberType is used to check if the type is Member type of Nested type.
Module Gets the module of the type.
Name Gets the name of the type.
Namespace Gets the namespace of the type.

C# Type Methods

A list of important methods of Type class are given below:

Method Description
GetConstructors() Returns all the public constructors for the Type.
GetConstructors(BindingFlags) Returns all the constructors for the Type with specified BindingFlags.
GetFields() Returns all the public fields for the Type.
GetFields(BindingFlags) Returns all the public constructors for the Type with specified BindingFlags.
GetMembers() Returns all the public members for the Type.
GetMembers(BindingFlags) Returns all the members for the Type with specified BindingFlags.
GetMethods() Returns all the public methods for the Type.
GetMethods(BindingFlags) Returns all the methods for the Type with specified BindingFlags.
GetProperties() Returns all the public properties for the Type.
GetProperties(BindingFlags) Returns all the properties for the Type with specified BindingFlags.
GetType() Gets the current Type.
GetType(String) Gets the Type for the given name.

C# Reflection Example: Get Type

 
  1. using System;  
  2. public class ReflectionExample  
  3. {  
  4.    public static void Main()  
  5.     {  
  6.         int a = 10;  
  7.         Type type = a.GetType();  
  8.         Console.WriteLine(type);  
  9.     }  
  10. }  

Output:

System.Int32

C# Reflection Example: Get Assembly

 
  1. using System;  
  2. using System.Reflection;  
  3. public class ReflectionExample  
  4. {  
  5.    public static void Main()  
  6.     {  
  7.         Type t = typeof(System.String);  
  8.         Console.WriteLine(t.Assembly);   
  9.    }  
  10. }  

Output:

mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

C# Reflection Example: Print Type Information

 
  1. using System;  
  2. using System.Reflection;  
  3. public class ReflectionExample  
  4. {  
  5.     public static void Main()  
  6.     {  
  7.         Type t = typeof(System.String);  
  8.         Console.WriteLine(t.FullName);  
  9.         Console.WriteLine(t.BaseType);  
  10.         Console.WriteLine(t.IsClass);  
  11.         Console.WriteLine(t.IsEnum);  
  12.         Console.WriteLine(t.IsInterface);  
  13.     }  
  14. }  

Output:

System.String
System.Object
true
false
false

C# Reflection Example: Print Constructors

 
  1. using System;  
  2. using System.Reflection;  
  3. public class ReflectionExample  
  4. {  
  5.     public static void Main()  
  6.     {  
  7.         Type t = typeof(System.String);  
  8.           
  9.         Console.WriteLine("Constructors of {0} type...", t);  
  10.         ConstructorInfo[] ci = t.GetConstructors(BindingFlags.Public | BindingFlags.Instance);  
  11.         foreach (ConstructorInfo c in ci)  
  12.         {  
  13.             Console.WriteLine(c);  
  14.         }  
  15.     }  
  16. }  

Output:

Constructors of System.String type...
Void .ctor(Char*)
Void .ctor(Char*, Int32, Int32)
Void .ctor(SByte*)
Void .ctor(SByte*, Int32, Int32)
Void .ctor(SByte*, Int32, Int32, System.Text.Encoding)
Void .ctor(Char[], Int32, Int32)
Void .ctor(Char[])
Void .ctor(Char, Int32)

C# Reflection Example: Print Methods

 
  1. using System;  
  2. using System.Reflection;  
  3. public class ReflectionExample  
  4. {  
  5.     public static void Main()  
  6.     {  
  7.         Type t = typeof(System.String);  
  8.           
  9.         Console.WriteLine("Methods of {0} type...", t);  
  10.         MethodInfo[] ci = t.GetMethods(BindingFlags.Public | BindingFlags.Instance);  
  11.         foreach (MethodInfo m in ci)  
  12.         {  
  13.             Console.WriteLine(m);  
  14.         }  
  15.     }  
  16. }  

Output:

Methods of System.String type...
Boolean Equals(System.Object)
Boolean Equals(System.String)
Boolean Equals(System.String, System.StringComparison)
Char get_Chars(Int32)
Void copyTo(Int32, char[], Int32, Int32)
Char[] ToCharArray()
....

C# Reflection Example: Print Fields

 
  1. using System;  
  2. using System.Reflection;  
  3. public class ReflectionExample  
  4. {  
  5.     public static void Main()  
  6.     {  
  7.         Type t = typeof(System.String);  
  8.           
  9.         Console.WriteLine("Fields of {0} type...", t);  
  10.         FieldInfo[] ci = t.GetFields(BindingFlags.Public | BindingFlags.Static | BindingFlags.NonPublic);  
  11.         foreach (FieldInfo f in ci)  
  12.         {  
  13.             Console.WriteLine(f);  
  14.         }  
  15.     }  
  16. }  

Output:

Fields of System.String type...
System.String Empty
Int32 TrimHead
Int32 TrimTail
Int32 TrimBoth
Int32 charPtrAlignConst
Int32 alignConst