Type.GetConstructor Method (Type())


Searches for a public instance constructor whose parameters match the types in the specified array.

Namespace:   System
Assembly:  mscorlib (in mscorlib.dll)

Public Function GetConstructor (
	types As Type()
) As ConstructorInfo


Type: System.Type()

An array of Type objects representing the number, order, and type of the parameters for the desired constructor.


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

An object representing the public instance constructor whose parameters match the types in the parameter type array, if found; otherwise, null.

Exception Condition

types is null.


One of the elements in types is null.


types is multidimensional.

This method overload looks for public instance constructors and cannot be used to obtain a class initializer (.cctor). To get a class initializer, use an overload that takes BindingFlags, and specify BindingFlags.Static | BindingFlags.NonPublic (BindingFlags.StaticOrBindingFlags.NonPublic in Visual Basic). You can also get the class initializer using the TypeInitializer property.

If the requested constructor is non-public, this method returns null.


You cannot omit parameters when looking up constructors and methods. You can only omit parameters when invoking.

If the current Type represents a constructed generic type, this method returns the ConstructorInfo with the type parameters replaced by the appropriate type arguments. If the current Type represents a type parameter in the definition of a generic type or generic method, this method always returns null.

The following example obtains the type of MyClass, gets the ConstructorInfo object, and displays the constructor signature.

Imports System
Imports System.Reflection
Imports System.Security
Imports Microsoft.VisualBasic

Public Class MyClass1

    Public Sub New()
    End Sub 'NewNew

    Public Sub New(ByVal i As Integer)
    End Sub 'NewNew

    Public Shared Sub Main()
            Dim myType As Type = GetType(MyClass1)
            Dim types(0) As Type
            types(0) = GetType(Int32)
            ' Get the constructor that takes an integer as a parameter.
            Dim constructorInfoObj As ConstructorInfo = myType.GetConstructor(types)
            If Not (constructorInfoObj Is Nothing) Then
                Console.WriteLine("The constructor of MyClass that takes an integer as a parameter is: ")
                Console.WriteLine("The constructor of MyClass that takes no " + "parameters is not available.")
            End If

        Catch e As Exception
            Console.WriteLine("Exception caught.")
            Console.WriteLine(("Source: " + e.Source))
            Console.WriteLine(("Message: " + e.Message))
        End Try
    End Sub 'Main
End Class 'MyClass1

.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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