Module.FindTypes Method

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

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

virtual array<Type^>^ FindTypes (
	TypeFilter^ filter, 
	Object^ filterCriteria
public Type[] FindTypes (
	TypeFilter filter, 
	Object filterCriteria
public function FindTypes (
	filter : TypeFilter, 
	filterCriteria : Object
) : Type[]
Not applicable.



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.

using namespace System;
using namespace System::Reflection;
using namespace System::Collections;
public ref class MySecondClass{};

// This class does not fit the filter criterion My*.
public ref class YourClass{};

int main()
   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 = moduleArray[ 0 ];
   tArray = myModule->FindTypes( Module::FilterTypeName, "My*" );
   IEnumerator^ myEnum = tArray->GetEnumerator();
   while ( myEnum->MoveNext() )
      Type^ t = safe_cast<Type^>(myEnum->Current);
      Console::WriteLine( "Found a module beginning with My*: {0}.", t->Name );

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 Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0