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Module.FindTypes Method

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

[Visual Basic]
Public Overridable Function FindTypes( _
   ByVal filter As TypeFilter, _
   ByVal filterCriteria As Object _
) As Type()
[C#]
public virtual Type[] FindTypes(
 TypeFilter filter,
 object filterCriteria
);
[C++]
public: virtual Type* FindTypes(
 TypeFilter* filter,
 Object* filterCriteria
) [];
[JScript]
public function FindTypes(
   filter : TypeFilter,
 filterCriteria : Object
) : Type[];

Parameters

filter
The delegate used to filter the classes.
filterCriteria
An Object used to filter the classes.

Return Value

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

Exceptions

Exception Type Condition
ReflectionTypeLoadException One or more classes in a module could not be loaded.

Remarks

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.

Example

[Visual Basic, C#, C++] The following example demonstrates the FindTypes method.

[Visual Basic] 
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

[C#] 
using System;
using System.Reflection;

namespace ReflectionModule_Examples
{
    class MyMainClass
    {
        static void Main()
        {
            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 = moduleArray[0];

            Type[] tArray;

            tArray = myModule.FindTypes(Module.FilterTypeName, "My*");
            
            foreach(Type t in tArray)
            {
                Console.WriteLine("Found a module beginning with My*: {0}.", t.Name);
            }
        }
    }

    class MySecondClass
    {
    }

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

[C++] 
#using <mscorlib.dll>

using namespace System;
using namespace System::Reflection;
using namespace System::Collections;

public __gc class MySecondClass
{
};

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

int main()
{
   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 = moduleArray[0];

   Type* tArray[];

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

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also

Module Class | Module Members | System.Reflection Namespace | FilterTypeName | FilterTypeNameIgnoreCase | ReflectionTypeLoadException

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