MemberInfo.GetCustomAttributes 方法

Source:

MemberInfo.cs

Source:

MemberInfo.cs

Source:

MemberInfo.cs

Source:

MemberInfo.cs

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

public abstract object[] GetCustomAttributes(bool inherit);

abstract member GetCustomAttributes : bool -> obj[]

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

参数

返回

一个包含应用于此成员的所有自定义属性的数组，或者在未定义任何特性时为包含零个元素的数组。

实现

例外

示例

以下示例定义一个自定义属性，并将该特性与 MyClass.MyMethod关联，在运行时检索该属性，并显示结果。

using System;
using System.Reflection;

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

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

public class MemberInfo_GetCustomAttributes
{
    public static void Main()
    {
        try
        {
            // Get the type of MyClass1.
            Type myType = typeof(MyClass1);
            // Get the members associated with MyClass1.
            MemberInfo[] myMembers = myType.GetMembers();

            // Display the attributes for each of the members of MyClass1.
            for(int i = 0; i < myMembers.Length; i++)
            {
                Object[] myAttributes = myMembers[i].GetCustomAttributes(true);
                if(myAttributes.Length > 0)
                {
                    Console.WriteLine("\nThe attributes for the member {0} are: \n", myMembers[i]);
                    for(int j = 0; j < myAttributes.Length; j++)
                        Console.WriteLine("The type of the attribute is {0}.", myAttributes[j]);
                }
            }
        }
        catch(Exception e)
        {
            Console.WriteLine("An exception occurred: {0}", e.Message);
        }
    }
}

Imports System.Reflection

' Define a custom attribute with one named parameter.
<AttributeUsage(AttributeTargets.All)> 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 that has the custom attribute associated with one of its members.
Public Class MyClass1

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


Public Class MemberInfo_GetCustomAttributes

    Public Shared Sub Main()
        Try
            ' Get the type of MyClass1.
            Dim myType As Type = GetType(MyClass1)
            ' Get the members associated with MyClass1.
            Dim myMembers As MemberInfo() = myType.GetMembers()

            ' Display the attributes for each of the members of MyClass1.
            Dim i As Integer
            For i = 0 To myMembers.Length - 1
                Dim myAttributes As [Object]() = myMembers(i).GetCustomAttributes(False)
                If myAttributes.Length > 0 Then
                    Console.WriteLine("The attributes for the member {0} are: ", myMembers(i))
                    Dim j As Integer
                    For j = 0 To myAttributes.Length - 1
                        Console.WriteLine("The type of the attribute is: {0}", myAttributes(j))
                    Next j
                End If
            Next i
        Catch e As Exception
            Console.WriteLine("An exception occurred: {0}.", e.Message)
        End Try
    End Sub
End Class

注解

此方法忽略 inherit 属性和事件的 参数。 若要在继承链中搜索属性和事件的属性，请使用 方法的适当 Attribute.GetCustomAttributes 重载。

另请参阅

• Object
• CustomAttributeBuilder

Source:

MemberInfo.cs

Source:

MemberInfo.cs

Source:

MemberInfo.cs

Source:

MemberInfo.cs

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

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

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

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

参数

返回

应用于此成员的自定义属性的数组，如果未应用可分配给 attributeType 的属性，则为含零元素的数组。

实现

例外

示例

以下示例定义了一个名为 BaseClass 的类，该类具有两个非继承成员：名为 的 total 线程静态字段和一个名为 MethodA不符合 CLS 的方法。 名为 的 DerivedClass 类继承自 BaseClass 并重写其 MethodA 方法。 请注意，不会对 的成员 DerivedClass应用任何属性。 该示例循环访问 的成员DerivedClass，以确定 或 属性是否已CLSCompliantAttributeThreadStaticAttribute应用于它们。 由于 inherit 是 true，因此该方法在 的 DerivedClass 继承层次结构中搜索指定的属性。 如示例输出所示， total 字段使用 ThreadStaticAttribute 属性进行修饰， MethodA 方法使用 CLSCompliantAttribute 特性进行修饰。

using System;

public class BaseClass
{
   [ThreadStatic] public int total;

   [CLSCompliant(false)] public virtual uint MethodA()
   {
      return (uint) 100;
   }
}

public class DerivedClass : BaseClass
{
   public override uint MethodA()
   {
      total++;
      return 200;
   }
}

public class Example
{
   public static void Main()
   {
      Type t = typeof(DerivedClass);
      Console.WriteLine("Members of {0}:", t.FullName);
      foreach (var m in t.GetMembers())
      {
         bool hasAttribute = false;
         Console.Write("   {0}: ", m.Name);
         if (m.GetCustomAttributes(typeof(CLSCompliantAttribute), true).Length > 0) {
            Console.Write("CLSCompliant");
            hasAttribute = true;
         }
         if (m.GetCustomAttributes(typeof(ThreadStaticAttribute), true).Length > 0) {
            Console.Write("ThreadStatic");
            hasAttribute = true;
         }
         if (!hasAttribute)
            Console.Write("No attributes");

         Console.WriteLine();
      }
   }
}
// The example displays the following output:
//       Members of DerivedClass:
//          MethodA: CLSCompliant
//          ToString: No attributes
//          Equals: No attributes
//          GetHashCode: No attributes
//          typeof: No attributes
//          .ctor: No attributes
//          total: ThreadStatic

Public Class BaseClass
   <ThreadStatic> Public total As Integer
   
   <CLSCompliant(False)> Public Overridable Function MethodA() As UInt32
      Return CUInt(100)
   End Function
End Class

Public Class DerivedClass : Inherits BaseClass
   Public Overrides Function MethodA() As UInt32
      total += 1
      Return 200
   End Function
End Class

Module Example
   Public Sub Main()
      Dim t As Type = GetType(DerivedClass)
      Console.WriteLine("Members of {0}:", t.FullName)
      For Each m In t.GetMembers()
         Dim hasAttribute As Boolean = False
         Console.Write("   {0}: ", m.Name)
         If m.GetCustomAttributes(GetType(CLSCompliantAttribute), True).Length > 0 Then
            Console.Write("CLSCompliant")
            hasAttribute = True
         End If
         If m.GetCustomAttributes(GetType(ThreadStaticAttribute), True).Length > 0 Then
            Console.Write("ThreadStatic")
            hasAttribute = True
         End If
         If Not hasAttribute Then
            Console.Write("No attributes")
         End If
         Console.WriteLine()
      Next
   End Sub
End Module
' The example displays the following output:
'       Members of DerivedClass:
'          MethodA: CLSCompliant
'          ToString: No attributes
'          Equals: No attributes
'          GetHashCode: No attributes
'          GetType: No attributes
'          .ctor: No attributes
'          total: ThreadStatic

注解

此方法忽略 inherit 属性和事件的 参数。 若要在继承链中搜索属性和事件的属性，请使用 方法的适当 Attribute.GetCustomAttributes 重载。