Type.IsAssignableFrom Method

'Declaration
Public Overridable Function IsAssignableFrom ( _
	c As Type _
) As Boolean
'Usage
Dim instance As Type
Dim c As Type
Dim returnValue As Boolean

returnValue = instance.IsAssignableFrom(c)

public boolean IsAssignableFrom (
	Type c
)

public function IsAssignableFrom (
	c : Type
) : boolean

Not applicable.

TypeBuilder b1 = moduleBuilder.DefineType("B", TypeAttributes.Public, typeof(A));
// Returns true:
typeof(A).IsAssignableFrom(b1))

Imports System
Imports System.Collections.Generic

Class ArrayTypeTest

    Public Shared Sub Main()
        ' Demonstrate classes:
        Console.WriteLine("Defned Classes:")
        Dim room1 As Room = New Room
        Dim kitchen1 As Kitchen = New Kitchen
        Dim bedroom1 As Bedroom = New Bedroom
        Dim guestroom1 As Guestroom = New Guestroom
        Dim masterbedroom1 As MasterBedroom = New MasterBedroom

        Dim room1Type As Type = room1.GetType
        Dim kitchen1Type As Type = kitchen1.GetType
        Dim bedroom1Type As Type = bedroom1.GetType
        Dim guestroom1Type As Type = guestroom1.GetType
        Dim masterbedroom1Type As Type = masterbedroom1.GetType

        Console.WriteLine("room assignable from kitchen: {0}", room1Type.IsAssignableFrom(kitchen1Type))
        Console.WriteLine("bedroom assignable from guestroom: {0}", bedroom1Type.IsAssignableFrom(guestroom1Type))
        Console.WriteLine("kitchen assignable from masterbedroom: {0}", kitchen1Type.IsAssignableFrom(masterbedroom1Type))

        ' Demonstrate arrays:
        Console.WriteLine()
        Console.WriteLine("Integer arrays:")

        Dim array10(10) As Integer
        Dim array2(2) As Integer
        Dim array22(2, 2) As Integer
        Dim array24(2, 4) As Integer

        Dim array10Type As Type = array10.GetType
        Dim array2Type As Type = array2.GetType
        Dim array22Type As Type = array22.GetType
        Dim array24Type As Type = array24.GetType

        Console.WriteLine("int[2] assignable from int[10]: {0}", array2Type.IsAssignableFrom(array10Type))
        Console.WriteLine("int[2] assignable from int[2,4]: {0}", array2Type.IsAssignableFrom(array24Type))
        Console.WriteLine("int[2,4] assignable from int[2,2]: {0}", array24Type.IsAssignableFrom(array22Type))

        ' Demonstrate generics:
        Console.WriteLine()
        Console.WriteLine("Generics:")
        ' Note that "int?[]" is the same as "Nullable<int>[]"

        Dim arrayNull(10) As Nullable(Of Integer)
        Dim genIntList As New List(Of Integer)
        Dim genTList As New List(Of Type)

        Dim arrayNullType As Type = arrayNull.GetType
        Dim genIntListType As Type = genIntList.GetType
        Dim genTListType As Type = genTList.GetType

        Console.WriteLine("int[10] assignable from int?[10]: {0}", array10Type.IsAssignableFrom(arrayNullType))
        Console.WriteLine("List<int> assignable from List<Type>: {0}", genIntListType.IsAssignableFrom(array10Type))
        Console.WriteLine("List<Type> assignable from List<int>: {0}", genTListType.IsAssignableFrom(genTListType))
        Console.ReadLine()
    End Sub
End Class
Class Room
End Class
Class Kitchen
    Inherits Room
End Class
Class Bedroom
    Inherits Room
End Class
Class Guestroom
    Inherits Bedroom
End Class
Class MasterBedroom
    Inherits Bedroom
End Class

Defned Classes:
room assignable from kitchen: True
bedroom assignable from guestroom: True
kitchen assignable from masterbedroom: False

Integer arrays:
int[2] assignable from int[10]: True
int[2] assignable from int[2,4]: False
int[2,4] assignable from int[2,2]: True

Generics:
int[10] assignable from int?[10]: False
List<int> assignable from List<Type>: False
List<Type> assignable from List<int>: True