ParameterInfo.GetCustomAttributes Metode

Definisi

Ruang nama:

System.Reflection

Rakitan:

System.Runtime.dll

Mendapatkan atribut kustom yang diterapkan ke parameter ini.

Overload

GetCustomAttributes(Type, Boolean)	Mendapatkan atribut kustom dari jenis yang ditentukan atau jenis turunannya yang diterapkan ke parameter ini.
GetCustomAttributes(Boolean)	Mendapatkan semua atribut kustom yang ditentukan pada parameter ini.

GetCustomAttributes(Type, Boolean)

Sumber:

ParameterInfo.cs

Mendapatkan atribut kustom dari jenis yang ditentukan atau jenis turunannya yang diterapkan ke parameter ini.

public:
 virtual cli::array <System::Object ^> ^ GetCustomAttributes(Type ^ attributeType, bool inherit);

public virtual object[] GetCustomAttributes (Type attributeType, bool inherit);

abstract member GetCustomAttributes : Type * bool -> obj[]
override this.GetCustomAttributes : Type * bool -> obj[]

Public Overridable Function GetCustomAttributes (attributeType As Type, inherit As Boolean) As Object()

Parameter

attributeType

Type

Atribut kustom yang diidentifikasi berdasarkan jenis.

inherit

Boolean

Argumen ini diabaikan untuk objek tipe ini.

Mengembalikan

Object[]

Array yang berisi atribut kustom dari jenis yang ditentukan atau jenis turunannya.

Penerapan

GetCustomAttributes(Type, Boolean)

Pengecualian

ArgumentException

Jenis harus merupakan jenis yang disediakan oleh sistem runtime yang mendasarinya.

ArgumentNullException

attributeTypeadalah null.

TypeLoadException

Tipe atribut kustom tidak dapat dimuat.

Keterangan

Metode ini mengabaikan inherit parameter . Untuk mencari rantai pewarisan untuk atribut pada parameter, gunakan kelebihan beban metode yang Attribute.GetCustomAttributes sesuai.

GetCustomAttributes(Boolean)

Sumber:

ParameterInfo.cs

Mendapatkan semua atribut kustom yang ditentukan pada parameter ini.

public:
 virtual cli::array <System::Object ^> ^ GetCustomAttributes(bool inherit);

public virtual object[] GetCustomAttributes (bool inherit);

abstract member GetCustomAttributes : bool -> obj[]
override this.GetCustomAttributes : bool -> obj[]

Public Overridable Function GetCustomAttributes (inherit As Boolean) As Object()

Parameter

inherit

Boolean

Argumen ini diabaikan untuk objek tipe ini.

Mengembalikan

Object[]

Array yang berisi semua atribut kustom yang diterapkan ke parameter ini.

Penerapan

GetCustomAttributes(Boolean)

Pengecualian

TypeLoadException

Tipe atribut kustom tidak dapat dimuat.

Contoh

Contoh berikut menunjukkan bagaimana atribut kustom yang telah diterapkan ke parameter metode dapat diambil pada durasi. Contoh mendefinisikan atribut kustom bernama MyAttribute yang dapat diterapkan ke parameter. Contoh kemudian mendefinisikan kelas bernama MyClass dengan metode bernama MyMethod, dan berlaku MyAttribute untuk parameter metode .

Ketika contoh dijalankan, ia menggunakan GetCustomAttributes(Boolean) metode untuk mengambil atribut kustom yang telah diterapkan ke semua parameter semua metode di MyClass, dan menampilkannya di konsol.

using namespace System;
using namespace System::Reflection;

// Define a custom attribute with one named parameter.
[AttributeUsage(AttributeTargets::Parameter)]
public ref class MyAttribute: public Attribute
{
private:
   String^ myName;

public:
   MyAttribute( String^ name )
   {
      myName = name;
   }

   property String^ Name 
   {
      String^ get()
      {
         return myName;
      }
   }
};

// Define a class which has a custom attribute associated with one of the 
// parameters of a method. 
public ref class MyClass1
{
public:
   void MyMethod( 
      [MyAttribute("This is an example parameter attribute")]
      int i ) {}
};

void main()
{
   // Get the type of the class 'MyClass1'.
   Type^ myType = MyClass1::typeid;

   // Get the members associated with the class 'MyClass1'.
   array<MethodInfo^>^myMethods = myType->GetMethods();

   // Display the attributes for each of the parameters of each method of the class 'MyClass1'.
   for ( int i = 0; i < myMethods->Length; i++ )
   {
      // Get the parameters for the method.
      array<ParameterInfo^>^myParameters = myMethods[ i ]->GetParameters();

      if ( myParameters->Length > 0 )
      {
         Console::WriteLine( "\nThe parameters for the method \"{0}\" that have custom attributes are:", myMethods[ i ] );
         for ( int j = 0; j < myParameters->Length; j++ )
         {
            // Get the attributes of type 'MyAttribute' for each parameter.
            array<Object^>^myAttributes = myParameters[ j ]->GetCustomAttributes( MyAttribute::typeid, false );

            if ( myAttributes->Length > 0 )
            {
               Console::WriteLine( "Parameter {0}, name = {1}, type = {2} has attributes:",
                  myParameters[ j ]->Position, 
                  myParameters[ j ]->Name, 
                  myParameters[ j ]->ParameterType );
               for ( int k = 0; k < myAttributes->Length; k++ )
               {
                  Console::WriteLine( "\t{0}", myAttributes[ k ] );
               }
            }
         }
      }
   }
}
/* This code example produces the following output:

The parameters for the method Void MyMethod(Int32) that have custom attributes are :
Parameter 0, name = i, type = System.Int32 has attributes:
        MyAttribute

The parameters for the method Boolean Equals(System.Object) that have custom attributes are :
 */

using System;
using System.Reflection;

// Define a custom attribute with one named parameter.
[AttributeUsage(AttributeTargets.Parameter)]
public class MyAttribute : Attribute
{
    private string myName;
    public MyAttribute(string name)
    {
        myName = name;
    }
    public string Name
    {
        get
        {
            return myName;
        }
    }
}

// Define a class which has a custom attribute associated with one of the
// parameters of a method.
public class MyClass1
{
    public void MyMethod(
        [MyAttribute("This is an example parameter attribute")]
        int i)
    {
        return;
    }
}

public class MemberInfo_GetCustomAttributes
{
    public static void Main()
    {
        // Get the type of the class 'MyClass1'.
        Type myType = typeof(MyClass1);
        // Get the members associated with the class 'MyClass1'.
        MethodInfo[] myMethods = myType.GetMethods();

        // Display the attributes for each of the parameters of each method of the class 'MyClass1'.
        for(int i = 0; i < myMethods.Length; i++)
        {
            // Get the parameters for the method.
            ParameterInfo[] myParameters = myMethods[i].GetParameters();

            if (myParameters.Length > 0)
            {
                Console.WriteLine("\nThe parameters for the method {0} that have custom attributes are :", myMethods[i]);
                for(int j = 0; j < myParameters.Length; j++)
                {
                    // Get the attributes of type 'MyAttribute' for each parameter.
                    Object[] myAttributes = myParameters[j].GetCustomAttributes(typeof(MyAttribute), false);

                    if (myAttributes.Length > 0)
                    {
                        Console.WriteLine("Parameter {0}, name = {1}, type = {2} has attributes: ",
                            myParameters[j].Position, myParameters[j].Name, myParameters[j].ParameterType);
                        for(int k = 0; k < myAttributes.Length; k++)
                        {
                            Console.WriteLine("\t{0}", myAttributes[k]);
                        }
                    }
                }
            }
        }
    }
}
/* This code example produces the following output:

The parameters for the method Void MyMethod(Int32) that have custom attributes are :
Parameter 0, name = i, type = System.Int32 has attributes:
        MyAttribute

The parameters for the method Boolean Equals(System.Object) that have custom attributes are :
 */

Imports System.Reflection

' Define a custom attribute with one named parameter.
<AttributeUsage(AttributeTargets.Parameter)> Public Class MyAttribute
    Inherits Attribute
    Private myName As String

    Public Sub New(ByVal name As String)
        myName = name
    End Sub 

    Public ReadOnly Property Name() As String
        Get
            Return myName
        End Get
    End Property
End Class 

' Define a class which has a custom attribute associated with one of 
' the parameters of a method. 
Public Class MyClass1

    Public Sub MyMethod( _
            <MyAttribute("This is an example parameter attribute")> _
            ByVal i As Integer _
        )
        Return
    End Sub 
End Class 


Public Class MemberInfo_GetCustomAttributes

    Public Shared Sub Main()
        ' Get the type of the class 'MyClass1'.
        Dim myType As Type = GetType(MyClass1)
        ' Get the members associated with the class 'MyClass1'.
        Dim myMethods As MethodInfo() = myType.GetMethods()

        ' Display the attributes for each of the parameters of each method of the class 'MyClass1'.
        For i As Integer = 0 To myMethods.Length - 1
            ' Get the parameters for the method.
            Dim myParameters As ParameterInfo() = myMethods(i).GetParameters()

            If myParameters.Length > 0 Then
                Console.WriteLine(vbCrLf & "The parameters for the method {0} that have custom attributes are : ", myMethods(i))
                For j As Integer = 0 To myParameters.Length - 1
                    ' Get the attributes of type 'MyAttribute' for each parameter.
                    Dim myAttributes As Object() = myParameters(j).GetCustomAttributes(GetType(MyAttribute), False)

                    If myAttributes.Length > 0 Then
                        Console.WriteLine("Parameter {0}, name = {1}, type = {2} has attributes: ", _
                            myParameters(j).Position, myParameters(j).Name, myParameters(j).ParameterType)
                        For k As Integer = 0 To myAttributes.Length - 1
                            Console.WriteLine(vbTab & "{0}", myAttributes(k))
                        Next k
                    End If
                Next j
            End If
        Next i
    End Sub 
End Class 

' This code example produces the following output:
'
'The parameters for the method Void MyMethod(Int32) that have custom attributes are :
'Parameter 0, name = i, type = System.Int32 has attributes:
'        MyAttribute
'
'The parameters for the method Boolean Equals(System.Object) that have custom attributes are :

Keterangan

Metode ini mengabaikan inherit parameter . Untuk mencari rantai pewarisan untuk atribut pada parameter, gunakan kelebihan beban metode yang Attribute.GetCustomAttributes sesuai.