Type.GetConstructor Method (array<Type[])

Parameters

• types
  Type: array<System.Type[]
  An array of Type objects representing the number, order, and type of the parameters for the desired constructor.
  -or-
  An empty array of Type objects, to get a constructor that takes no parameters. Such an empty array is provided by the static field Type.EmptyTypes.

Return Value

Type: System.Reflection.ConstructorInfo
A ConstructorInfo object representing the public instance constructor whose parameters match the types in the parameter type array, if found; otherwise, nulla null reference (Nothing in Visual Basic).

Imports System.Reflection
Imports System.Security

Public Class Example

    Public Sub New()
    End Sub 

    Public Sub New(ByVal i As Integer)
    End Sub 

    Public Shared Sub Demo(ByVal outputBlock As System.Windows.Controls.TextBlock)

         Dim myType As Type = GetType(Example)
         Dim parameters() As Type = { GetType(Int32) }

         ' Get the constructor that takes an integer as a parameter.
         Dim ctor As ConstructorInfo = myType.GetConstructor(parameters)

         If ctor Is Nothing Then
             outputBlock.Text &= _
                 "There is no public constructor of MyClass that takes an integer as a parameter." & vbCrLf
         Else
             outputBlock.Text &= _
                 "The public constructor of MyClass that takes an integer as a parameter is: " & vbCrLf
             outputBlock.Text &= ctor.ToString() & vbCrLf
         End If

    End Sub 
End Class 

' This example produces the following output:
'
'The public constructor of MyClass that takes an integer as a parameter is:
'Void .ctor(Int32)

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

public class Example
{
    public Example() { }
    public Example(int i) { }

    public static void Demo(System.Windows.Controls.TextBlock outputBlock)
    {
        Type myType = typeof(Example);
        Type[] parameters = { typeof(int) };

        // Get the constructor that takes an integer as a parameter.
        ConstructorInfo ctor = myType.GetConstructor(parameters);

        if (ctor == null)
        {
            outputBlock.Text += 
                "There is no public constructor of MyClass that takes an integer as a parameter.\n";
        }
        else
        {
            outputBlock.Text += 
                "The public constructor of MyClass that takes an integer as a parameter is:\n"; 
            outputBlock.Text += ctor.ToString() + "\n";
        }
    }
}

/* This example produces the following output:

The public constructor of MyClass that takes an integer as a parameter is:
Void .ctor(Int32)
 */