Type.FindInterfaces(TypeFilter, Object) Method

Definition

傳回 Type 物件的陣列,表示由目前 Type 所實作或繼承的介面的篩選清單。Returns an array of Type objects representing a filtered list of interfaces implemented or inherited by the current Type.

public:
 virtual cli::array <Type ^> ^ FindInterfaces(System::Reflection::TypeFilter ^ filter, System::Object ^ filterCriteria);
public virtual Type[] FindInterfaces (System.Reflection.TypeFilter filter, object filterCriteria);
abstract member FindInterfaces : System.Reflection.TypeFilter * obj -> Type[]
override this.FindInterfaces : System.Reflection.TypeFilter * obj -> Type[]
Public Overridable Function FindInterfaces (filter As TypeFilter, filterCriteria As Object) As Type()

Parameters

filter
TypeFilter

根據 filterCriteria 比較介面的委派。The delegate that compares the interfaces against filterCriteria.

filterCriteria
Object

判斷在傳回陣列中是否應包含介面的搜尋準則。The search criteria that determines whether an interface should be included in the returned array.

Returns

Type[]

Type 物件的陣列,表示由目前 Type 所實作或繼承介面的篩選清單,如果由目前 Type 所實作或繼承的介面都不符合篩選器,則為空陣列。An array of Type objects representing a filtered list of the interfaces implemented or inherited by the current Type, or an empty array if no interfaces matching the filter are implemented or inherited by the current Type.

Implements

Exceptions

filternullfilter is null.

靜態初始設定式已叫用並擲回了例外狀況。A static initializer is invoked and throws an exception.

Examples

下列範例會尋找指定的類型所實作為或繼承的指定介面,然後顯示介面名稱。The following example finds the specified interface implemented or inherited by the specified type, and then displays the interface names.

#using <system.xml.dll>

using namespace System;
using namespace System::Xml;
using namespace System::Reflection;
public ref class MyFindInterfacesSample
{
public:
    static bool MyInterfaceFilter(Type^ typeObj, Object^ criteriaObj)
    {
        if(typeObj->ToString()->Equals(criteriaObj->ToString()))
            return true;
        else
            return false;
   }
};

int main()
{
    try
    {
        XmlDocument^ myXMLDoc = gcnew XmlDocument;
        myXMLDoc->LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" 
            + "<title>Pride And Prejudice</title> </book>");
        Type^ myType = myXMLDoc->GetType();
      
        // Specify the TypeFilter delegate that compares the interfaces 
        // against filter criteria.
        TypeFilter^ myFilter = gcnew TypeFilter( 
            MyFindInterfacesSample::MyInterfaceFilter);
        array<String^>^myInterfaceList = {"System.Collections.IEnumerable",
            "System.Collections.ICollection"};
        for(int index = 0; index < myInterfaceList->Length; index++)
        {
            array<Type^>^myInterfaces = myType->FindInterfaces( 
                myFilter, myInterfaceList[index]);
            if(myInterfaces->Length > 0)
            {
                Console::WriteLine("\n{0} implements the interface {1}.", 
                    myType, myInterfaceList[index]);
                for(int j = 0; j < myInterfaces->Length; j++)
                Console::WriteLine("Interfaces supported: {0}.",
                    myInterfaces[j]);
            }
            else
                Console::WriteLine(
                    "\n{0} does not implement the interface {1}.", 
                    myType, myInterfaceList[index]);

        }
    }
    catch(ArgumentNullException^ e) 
    {
        Console::WriteLine("ArgumentNullException: {0}", e->Message);
    }
    catch(TargetInvocationException^ e) 
    {
        Console::WriteLine("TargetInvocationException: {0}", e->Message);
    }
    catch(Exception^ e) 
    {
        Console::WriteLine("Exception: {0}", e->Message);
    }
}

using System;
using System.Xml;
using System.Reflection;

public class MyFindInterfacesSample
{
    public static void Main()
    {
        try
        {
            XmlDocument myXMLDoc = new XmlDocument();
            myXMLDoc.LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" +
                "<title>Pride And Prejudice</title>" + "</book>");
            Type myType = myXMLDoc.GetType();

            // Specify the TypeFilter delegate that compares the
            // interfaces against filter criteria.
            TypeFilter myFilter = new TypeFilter(MyInterfaceFilter);
            String[] myInterfaceList = new String[2]
                {"System.Collections.IEnumerable",
                "System.Collections.ICollection"};
            for(int index=0; index < myInterfaceList.Length; index++)
            {
                Type[] myInterfaces = myType.FindInterfaces(myFilter,
                    myInterfaceList[index]);
                if (myInterfaces.Length > 0)
                {
                    Console.WriteLine("\n{0} implements the interface {1}.",
                        myType, myInterfaceList[index]);	
                    for(int j =0;j < myInterfaces.Length;j++)
                        Console.WriteLine("Interfaces supported: {0}.",
                            myInterfaces[j].ToString());
                }
                else
                    Console.WriteLine(
                        "\n{0} does not implement the interface {1}.",
                        myType,myInterfaceList[index]);	
            }
        }
        catch(ArgumentNullException e)
        {
            Console.WriteLine("ArgumentNullException: " + e.Message);
        }
        catch(TargetInvocationException e)
        {
            Console.WriteLine("TargetInvocationException: " + e.Message);
        }
        catch(Exception e)
        {
            Console.WriteLine("Exception: " + e.Message);
        }
    }

    public static bool MyInterfaceFilter(Type typeObj,Object criteriaObj)
    {
        if(typeObj.ToString() == criteriaObj.ToString())
            return true;
        else
            return false;
    }
}

Imports System.Xml
Imports System.Reflection

Public Class MyFindInterfacesSample
    Public Shared Sub Main()
        Try
            Dim myXMLDoc As New XmlDocument()
            myXMLDoc.LoadXml("<book genre='novel' ISBN='1-861001-57-5'>" _
                & "<title>Pride And Prejudice</title>" & "</book>")
            Dim myType As Type = myXMLDoc.GetType()

            ' Specify the TypeFilter delegate that compares the 
            ' interfaces against filter criteria.
            Dim myFilter As New TypeFilter(AddressOf MyInterfaceFilter)
            Dim myInterfaceList() As String = _
                {"System.Collections.IEnumerable", _
                "System.Collections.ICollection"}
            Dim index As Integer
            For index = 0 To myInterfaceList.Length - 1
                Dim myInterfaces As Type() = _
                    myType.FindInterfaces(myFilter, myInterfaceList(index))
                If myInterfaces.Length > 0 Then
                    Console.WriteLine(ControlChars.Cr & _
                        "{0} implements the interface {1}.", _
                        myType, myInterfaceList(index))
                    Dim j As Integer
                    For j = 0 To myInterfaces.Length - 1
                        Console.WriteLine("Interfaces supported: {0}", _
                            myInterfaces(j).ToString())
                    Next j
                Else
                    Console.WriteLine(ControlChars.Cr & _
                        "{0} does not implement the interface {1}.", _
                        myType, myInterfaceList(index))
                End If
            Next index
        Catch e As ArgumentNullException
            Console.WriteLine("ArgumentNullException: " & e.Message)
        Catch e As TargetInvocationException
            Console.WriteLine("TargetInvocationException: " & e.Message)
        Catch e As Exception
            Console.WriteLine("Exception: " & e.Message)
        End Try
    End Sub
    Public Shared Function MyInterfaceFilter(ByVal typeObj As Type, _
        ByVal criteriaObj As [Object]) As Boolean
        If typeObj.ToString() = criteriaObj.ToString() Then
            Return True
        Else
            Return False
        End If
    End Function 'MyInterfaceFilter 
End Class

Remarks

衍生類別可以覆寫這個方法。This method can be overridden by a derived class.

您也可以使用 System.Reflection.Module 類別所提供的 Module.FilterTypeNameModule.FilterTypeNameIgnoreCase 委派,代替 System.Reflection.TypeFilter 委派。The Module.FilterTypeName and Module.FilterTypeNameIgnoreCase delegates supplied by the System.Reflection.Module class may also be used, in lieu of the System.Reflection.TypeFilter delegate.

不論是由基類或這個類別本身所宣告,在搜尋期間都會考慮此類別所實作為的所有介面。All of the interfaces implemented by this class are considered during the search, whether declared by a base class or this class itself.

這個方法會搜尋基類階層,並傳回每個類別所執行的每個相符介面,以及每個介面所執行的所有相符介面(也就是傳回相符介面的可轉移結束)。This method searches the base class hierarchy, returning each of the matching interfaces each class implements as well as all the matching interfaces each of those interfaces implements (that is, the transitive closure of the matching interfaces is returned). 不會傳回重複的介面。No duplicate interfaces are returned.

如果目前的 Type 表示泛型型別或泛型方法定義中的類型參數,FindInterfaces 會搜尋在類型參數的條件約束中宣告的所有介面,以及透過條件約束中宣告的介面繼承的所有介面。If the current Type represents a type parameter in the definition of a generic type or generic method, FindInterfaces searches all the interfaces declared in the constraints on the type parameter, and all interfaces inherited through the interfaces declared in the constraints. 如果目前 Type 表示泛型型別的型別引數,FindInterfaces 會搜尋型別所實作為的所有介面,無論它們是否符合條件約束。If the current Type represents a type argument of a generic type, FindInterfaces searches all the interfaces implemented by the type, whether or not they match constraints.

Note

FindInterfaces 可以傳回泛型介面,即使在不是泛型的類型上也一樣。FindInterfaces can return generic interfaces, even on types that are not generic. 例如,非泛型型別可能會在 Visual Basic 中執行 IEnumerable<int>IEnumerable(Of Integer))。For example, a nongeneric type might implement IEnumerable<int> (IEnumerable(Of Integer) in Visual Basic).

Applies to

See also