Module.IsDefined(Type, Boolean) 方法

定義

命名空間:

System.Reflection

組件:

System.Runtime.dll

來源:

Module.cs

傳回值，這個值表示指定的屬性型別是否已套用至此模組。

public:
 virtual bool IsDefined(Type ^ attributeType, bool inherit);

public virtual bool IsDefined (Type attributeType, bool inherit);

abstract member IsDefined : Type * bool -> bool
override this.IsDefined : Type * bool -> bool

Public Overridable Function IsDefined (attributeType As Type, inherit As Boolean) As Boolean

參數

attributeType

Type

所要測試之自訂屬性的型別。

inherit

Boolean

這個類型的物件會忽略這個引數。

傳回

Boolean

如果一個或多個 attributeType 的執行個體已套用至這個模組，則為 true，否則為 false。

實作

IsDefined(Type, Boolean)

例外狀況

ArgumentNullException

attributeType 為 null。

ArgumentException

attributeType 不是執行階段所提供的 Type 物件。 例如，attributeType 是 TypeBuilder 物件。

範例

下列範例示範 如何使用 IsDefined 方法。

using namespace System;
using namespace System::Reflection;

namespace ReflectionModule_Examples
{

   //A very simple custom attribute.

   [AttributeUsage(AttributeTargets::Class|AttributeTargets::Module)]
   public ref class MySimpleAttribute: public Attribute
   {
   private:
      String^ name;

   public:
      MySimpleAttribute( String^ newName )
      {
         name = newName;
      }

   };

}


//Define a module-level attribute.

[module:ReflectionModule_Examples::MySimpleAttribute("module-level")];
int main()
{
   array<System::Reflection::Module^>^moduleArray;
   moduleArray = ReflectionModule_Examples::MySimpleAttribute::typeid->Assembly->GetModules( false );
   
   //In a simple project with only one module, the module at index
   // 0 will be the module containing these classes.
   System::Reflection::Module^ myModule = moduleArray[ 0 ];
   Type^ myType;
   myType = myModule->GetType( "ReflectionModule_Examples.MySimpleAttribute" );
   Console::WriteLine( "IsDefined(MySimpleAttribute) = {0}", myModule->IsDefined( myType, false ) );
}

using System;
using System.Reflection;

//Define a module-level attribute.
[module: ReflectionModule_Examples.MySimpleAttribute("module-level")]

namespace ReflectionModule_Examples
{
    class MyMainClass
    {
        static void Main()
        {
            Module[] moduleArray;
            
            moduleArray = typeof(MyMainClass).Assembly.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 myType;
            myType = myModule.GetType("ReflectionModule_Examples.MySimpleAttribute");
            Console.WriteLine("IsDefined(MySimpleAttribute) = {0}", myModule.IsDefined(myType, false));
        }
    }

    //A very simple custom attribute.
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Module)]
    public class MySimpleAttribute : Attribute
    {
        private string name;

        public MySimpleAttribute(string newName)
        {
            name = newName;
        }
    }
}

Imports System.Reflection

'Define a module-level attribute.
<Module: ReflectionModule_Examples.MySimpleAttribute("module-level")> 

'Define a module-level attribute.
Namespace ReflectionModule_Examples
    Class MyMainClass
        Shared Sub Main()
            Dim moduleArray() As [Module]

            moduleArray = GetType(MyMainClass).Assembly.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 myType As Type
            myType = myModule.GetType("ReflectionModule_Examples.MySimpleAttribute")
            Console.WriteLine("IsDefined(MySimpleAttribute) = {0}", myModule.IsDefined(myType, False))
        End Sub
    End Class

    'A very simple custom attribute.
    <AttributeUsage(AttributeTargets.Class Or AttributeTargets.Module)> _
    Public Class MySimpleAttribute
        Inherits Attribute
        Private name As String

        Public Sub New(ByVal newName As String)
            name = newName
        End Sub
    End Class
End Namespace 'ReflectionModule_Examples