ConstructorInfo Class

Definition

public ref class ConstructorInfo abstract : System::Reflection::MethodBase

public ref class ConstructorInfo abstract : System::Reflection::MethodBase, System::Runtime::InteropServices::_ConstructorInfo

public abstract class ConstructorInfo : System.Reflection.MethodBase

[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)]
[System.Serializable]
public abstract class ConstructorInfo : System.Reflection.MethodBase, System.Runtime.InteropServices._ConstructorInfo

[System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public abstract class ConstructorInfo : System.Reflection.MethodBase, System.Runtime.InteropServices._ConstructorInfo

type ConstructorInfo = class
    inherit MethodBase

[<System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)>]
[<System.Serializable>]
type ConstructorInfo = class
    inherit MethodBase
    interface _ConstructorInfo

[<System.Runtime.InteropServices.ClassInterface(System.Runtime.InteropServices.ClassInterfaceType.None)>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type ConstructorInfo = class
    inherit MethodBase
    interface _ConstructorInfo

Public MustInherit Class ConstructorInfo
Inherits MethodBase

Public MustInherit Class ConstructorInfo
Inherits MethodBase
Implements _ConstructorInfo

Inheritance

Object

MemberInfo

MethodBase

ConstructorInfo

Derived

Microsoft.JScript.JSConstructor

System.Reflection.Emit.ConstructorBuilder

Attributes

ClassInterfaceAttribute SerializableAttribute ComVisibleAttribute

Implements

_ConstructorInfo

Examples

The following example uses ConstructorInfo with GetConstructor and BindingFlags to find the constructors that match the specified search criteria.

using System;
using System.Reflection;
using System.Security;

public class MyClass3
{
    public MyClass3(int i) { }
    public static void Main()
    {
        try
        {
            Type myType = typeof(MyClass3);
            Type[] types = new Type[1];
            types[0] = typeof(int);
            // Get the public instance constructor that takes an integer parameter.
            ConstructorInfo constructorInfoObj = myType.GetConstructor(
                BindingFlags.Instance | BindingFlags.Public, null,
                CallingConventions.HasThis, types, null);
            if (constructorInfoObj != null)
            {
                Console.WriteLine("The constructor of MyClass3 that is a public " +
                    "instance method and takes an integer as a parameter is: ");
                Console.WriteLine(constructorInfoObj.ToString());
            }
            else
            {
                Console.WriteLine("The constructor of MyClass3 that is a public instance " +
                    "method and takes an integer as a parameter is not available.");
            }
        }
        catch (ArgumentNullException e)
        {
            Console.WriteLine("ArgumentNullException: " + e.Message);
        }
        catch (ArgumentException e)
        {
            Console.WriteLine("ArgumentException: " + e.Message);
        }
        catch (SecurityException e)
        {
            Console.WriteLine("SecurityException: " + e.Message);
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception: " + e.Message);
        }
    }
}

Public Class MyClass1
    Public Sub New(ByVal i As Integer)
    End Sub
    Public Shared Sub Main()
        Try
            Dim myType As Type = GetType(MyClass1)
            Dim types(0) As Type
            types(0) = GetType(Integer)
            ' Get the public instance constructor that takes an integer parameter.
            Dim constructorInfoObj As ConstructorInfo = _
                        myType.GetConstructor(BindingFlags.Instance Or _
                        BindingFlags.Public, Nothing, _
                        CallingConventions.HasThis, types, Nothing)
            If Not (constructorInfoObj Is Nothing) Then
                Console.WriteLine("The constructor of MyClass1 that " + _
                                  "is a public instance method and takes an " + _
                                  "integer as a parameter is: ")
                Console.WriteLine(constructorInfoObj.ToString())
            Else
                Console.WriteLine("The constructor MyClass1 that " + _
                                  "is a public instance method and takes an " + _
                                  "integer as a parameter is not available.")
            End If
        Catch e As ArgumentNullException
            Console.WriteLine("ArgumentNullException: " + e.Message)
        Catch e As ArgumentException
            Console.WriteLine("ArgumentException: " + e.Message)
        Catch e As SecurityException
            Console.WriteLine("SecurityException: " + e.Message)
        Catch e As Exception
            Console.WriteLine("Exception: " + e.Message)
        End Try
    End Sub
End Class

Remarks

ConstructorInfo is used to discover the attributes of a constructor as well as to invoke a constructor. Objects are created by calling Invoke on a ConstructorInfo returned by either the GetConstructors or GetConstructor method of a Type object.

Notes to Implementers

When you inherit from ConstructorInfo, you must override the following member overload: Invoke(BindingFlags, Binder, Object[], CultureInfo).