ParameterInfo.GetCustomAttributes Methode

Bron:

ParameterInfo.cs

Bron:

ParameterInfo.cs

Bron:

ParameterInfo.cs

Bron:

ParameterInfo.cs

Bron:

ParameterInfo.cs

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()

Parameters

Retouren

Een matrix die de aangepaste kenmerken van het opgegeven type of de afgeleide typen bevat.

Implementeringen

Uitzonderingen

Opmerkingen

Met deze methode wordt de inherit parameter genegeerd. Als u de overnameketen wilt doorzoeken op kenmerken op parameters, gebruikt u de juiste overbelasting van de Attribute.GetCustomAttributes methode.

Bron:

ParameterInfo.cs

Bron:

ParameterInfo.cs

Bron:

ParameterInfo.cs

Bron:

ParameterInfo.cs

Bron:

ParameterInfo.cs

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()

Parameters

Retouren

Een matrix die alle aangepaste kenmerken bevat die op deze parameter zijn toegepast.

Implementeringen

Uitzonderingen

Voorbeelden

In het volgende voorbeeld ziet u hoe aangepaste kenmerken die zijn toegepast op de parameters van methoden tijdens runtime kunnen worden opgehaald. In het voorbeeld wordt een aangepast kenmerk gedefinieerd dat MyAttribute kan worden toegepast op parameters. Het voorbeeld definieert vervolgens een klasse met MyClass een methode met de naam MyMethoden is van toepassing op MyAttribute een parameter van de methode.

Wanneer het voorbeeld wordt uitgevoerd, wordt de GetCustomAttributes(Boolean) methode gebruikt om de aangepaste kenmerken op te halen die zijn toegepast op alle parameters van alle methoden in MyClassen worden deze weergegeven in de console.

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 :

Opmerkingen

Met deze methode wordt de inherit parameter genegeerd. Als u de overnameketen wilt doorzoeken op kenmerken op parameters, gebruikt u de juiste overbelasting van de Attribute.GetCustomAttributes methode.