ParameterInfo.IsDefined(Type, Boolean) 메서드
정의
중요
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지정된 형식 또는 파생 형식의 사용자 지정 특성이 이 매개 변수에 적용되는지 여부를 확인합니다.
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 -> boolPublic Overridable Function IsDefined (attributeType As Type, inherit As Boolean) As Boolean매개 변수
- attributeType
- Type
검색할 Type 개체입니다.
- inherit
- Boolean
이 인수는 이 형식의 개체에 대해 무시됩니다.
반환
이 매개 변수에 attributeType 또는 파생 형식의 인스턴스가 하나 이상 적용되면 true이고, 그렇지 않으면 false입니다.
구현
예외
attributeType이(가) null인 경우
attributeType이 공용 언어 런타임에 제공되는 Type 개체가 아닌 경우
예제
다음 예제에서는 두 개의 사용자 지정 특성을 MyAttribute 정의합니다 MyDerivedAttribute. MyDerivedAttribute는 MyAttribute에서 파생됩니다. 그런 다음, 예제 클래스의 메서드 매개 변수에 이러한 특성을 적용합니다.
예제가 실행되면 메서드를 IsDefined 사용하여 예제 클래스에 있는 모든 메서드의 모든 매개 변수를 테스트합니다. 그런 다음, 해당 매개 변수가 있거나 MyAttribute MyDerivedAttribute.
// System::Reflection::ParameterInfo::GetCustomAttributes(Type, bool)
// System::Reflection::ParameterInfo::IsDefined(Type, bool)
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;
}
}
};
// Derive another custom attribute from MyAttribute.
[AttributeUsage(AttributeTargets::Parameter)]
public ref class MyDerivedAttribute: public MyAttribute
{
public:
MyDerivedAttribute( String^ name ) : MyAttribute( name ) {}
};
// Define a class with a method that has three parameters. Apply
// MyAttribute to one parameter, MyDerivedAttribute to another, and
// no attributes to the third.
public ref class MyClass1
{
public:
void MyMethod( [MyAttribute("This is an example parameter attribute")]
int i,
[MyDerivedAttribute("This is another parameter attribute")]
int j,
int k ){}
};
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();
// For each method of the class 'MyClass1', display all the parameters
// to which MyAttribute or its derived types have been applied.
for each ( MethodInfo^ mi in myMethods )
{
// Get the parameters for the method.
array<ParameterInfo^>^ myParameters = mi->GetParameters();
if ( myParameters->Length > 0 )
{
Console::WriteLine("\nThe following parameters of {0} have MyAttribute or a derived type:", mi);
for each ( ParameterInfo^ pi in myParameters)
{
if (pi->IsDefined(MyAttribute::typeid, false))
{
Console::WriteLine("Parameter {0}, name = {1}, type = {2}",
pi->Position, pi->Name, pi->ParameterType);
}
}
}
}
}
/* This code example produces the following output:
The following parameters of Void MyMethod(Int32, Int32, Int32) have MyAttribute or a derived type:
Parameter 0, name = i, type = System.Int32
Parameter 1, name = j, type = System.Int32
The following parameters of Boolean Equals(System.Object) have MyAttribute or a derived type:
*/
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;
}
}
}
// Derive another custom attribute from MyAttribute
[AttributeUsage(AttributeTargets.Parameter)]
public class MyDerivedAttribute : MyAttribute
{
public MyDerivedAttribute(string name) : base(name) {}
}
// Define a class with a method that has three parameters. Apply
// MyAttribute to one parameter, MyDerivedAttribute to another, and
// no attributes to the third.
public class MyClass1
{
public void MyMethod(
[MyAttribute("This is an example parameter attribute")]
int i,
[MyDerivedAttribute("This is another parameter attribute")]
int j,
int k )
{
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();
// For each method of the class 'MyClass1', display all the parameters
// to which MyAttribute or its derived types have been applied.
foreach (MethodInfo mi in myMethods)
{
// Get the parameters for the method.
ParameterInfo[] myParameters = mi.GetParameters();
if (myParameters.Length > 0)
{
Console.WriteLine("\nThe following parameters of {0} have MyAttribute or a derived type: ", mi);
foreach (ParameterInfo pi in myParameters)
{
if (pi.IsDefined(typeof(MyAttribute), false))
{
Console.WriteLine("Parameter {0}, name = {1}, type = {2}",
pi.Position, pi.Name, pi.ParameterType);
}
}
}
}
}
}
/* This code example produces the following output:
The following parameters of Void MyMethod(Int32, Int32, Int32) have MyAttribute or a derived type:
Parameter 0, name = i, type = System.Int32
Parameter 1, name = j, type = System.Int32
The following parameters of Boolean Equals(System.Object) have MyAttribute or a derived type:
*/
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
' Derive another custom attribute from MyAttribute
<AttributeUsage(AttributeTargets.Parameter)> _
Public Class MyDerivedAttribute
Inherits MyAttribute
Public Sub New(ByVal name As String)
MyBase.New(name)
End Sub
End Class
' Define a class with a method that has three parameters. Apply
' MyAttribute to one parameter, MyDerivedAttribute to another, and
' no attributes to the third.
Public Class MyClass1
Public Sub MyMethod(<MyAttribute("This is an example parameter attribute")> _
ByVal i As Integer, _
<MyDerivedAttribute("This is another parameter attribute")> _
ByVal j As Integer, _
ByVal k 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()
' For each method of the class 'MyClass1', display all the parameters
' to which MyAttribute or its derived types have been applied.
For Each mi As MethodInfo In myMethods
' Get the parameters for the method.
Dim myParameters As ParameterInfo() = mi.GetParameters()
If myParameters.Length > 0 Then
Console.WriteLine(vbCrLf & "The following parameters of {0} have MyAttribute or a derived type: ", mi)
For Each pi As ParameterInfo In myParameters
If pi.IsDefined(GetType(MyAttribute), False) Then
Console.WriteLine("Parameter {0}, name = {1}, type = {2}", _
pi.Position, pi.Name, pi.ParameterType)
End If
Next
End If
Next
End Sub
End Class
' This code example produces the following output:
'
'The following parameters of Void MyMethod(Int32, Int32, Int32) have MyAttribute or a derived type:
'Parameter 0, name = i, type = System.Int32
'Parameter 1, name = j, type = System.Int32
'
'The following parameters of Boolean Equals(System.Object) have MyAttribute or a derived type:
설명
이 메서드는 매개 변수를 inherit 무시합니다. 상속 체인에서 매개 변수의 특성을 검색하려면 메서드의 적절한 오버로드를 Attribute.IsDefined 사용합니다.