Module.FindTypes Method

Returns an array of classes accepted by the given filter and filter criteria.

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

Public Overridable Function FindTypes ( _
	filter As TypeFilter, _
	filterCriteria As Object _
) As Type()
Dim instance As Module
Dim filter As TypeFilter
Dim filterCriteria As Object
Dim returnValue As Type()

returnValue = instance.FindTypes(filter, filterCriteria)
public Type[] FindTypes (
	TypeFilter filter, 
	Object filterCriteria
public function FindTypes (
	filter : TypeFilter, 
	filterCriteria : Object
) : Type[]



The delegate used to filter the classes.


An Object used to filter the classes.

Return Value

An array of type Type containing classes that were accepted by the filter.

Exception typeCondition


One or more classes in a module could not be loaded.

ReflectionTypeLoadException is a special class load exception. The ReflectionTypeLoadException.Types property contains the array of classes that were defined in the module and were loaded. This array may contain some null values. The ReflectionTypeLoadException.LoaderExceptions property is an array of exceptions that represent the exceptions that were thrown by the class loader. The holes in the class array line up with the exceptions.

The delegate given by filter is called for each class in the module, passing along the Type object representing the class as well as the given filterCriteria. If filter returns a particular class, that class will be included in the returned array. If filter returns a null reference (Nothing in Visual Basic), all classes are returned and filterCriteria is ignored.

FindTypes cannot be used to look up parameterized types such as arrays.

The following example demonstrates the FindTypes method.

Imports System
Imports System.Reflection

Namespace ReflectionModule_Examples
    Class MyMainClass
        Shared Sub Main()
            Dim moduleArray() As [Module]

            moduleArray = [Assembly].GetExecutingAssembly().GetModules(False)

            ' In a simple project with only one module, the module at index
            ' 0 will be the module containing these classes.
            Dim myModule As [Module] = moduleArray(0)

            Dim tArray() As Type

            tArray = myModule.FindTypes([Module].FilterTypeName, "My*")

            Dim t As Type
            For Each t In tArray
                Console.WriteLine("Found a module beginning with My*: {0}", t.Name)
            Next t
        End Sub 'Main
    End Class 'MyMainClass

    Class MySecondClass
    End Class 'MySecondClass

    ' This class does not fit the filter criteria My*.
    Class YourClass
    End Class 'YourClass
End Namespace 'ReflectionModule_Examples

package ReflectionModule_Examples;
import System.*;
import System.Reflection.*;

class MyMainClass

    public static void main(String[] args)
        Module moduleArray[];
        moduleArray = Assembly.GetExecutingAssembly().GetModules(false);

        // In a simple project with only one module, the module at index
        // 0 will be the module containing these classes.
        Module myModule = (Module)moduleArray.get_Item(0);
        Type tArray[];
        tArray = myModule.FindTypes(Module.FilterTypeName, "My*");
        for (int iCtr = 0; iCtr < tArray.length; iCtr++) {
            Type t = tArray[iCtr];
            Console.WriteLine("Found a module beginning with My*: {0}.",
    } //main
} //MyMainClass

class MySecondClass
} //MySecondClass

// This class does not fit the filter criteria My*.
class YourClass
} //YourClass

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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