Type.IsPointer Propriété
Important
Certaines informations portent sur la préversion du produit qui est susceptible d’être en grande partie modifiée avant sa publication. Microsoft exclut toute garantie, expresse ou implicite, concernant les informations fournies ici.
Obtient une valeur indiquant si Type est un pointeur.
public:
virtual property bool IsPointer { bool get(); };
public:
property bool IsPointer { bool get(); };
public virtual bool IsPointer { get; }
public bool IsPointer { get; }
member this.IsPointer : bool
Public Overridable ReadOnly Property IsPointer As Boolean
Public ReadOnly Property IsPointer As Boolean
true
si Type est un pointeur ; sinon, false
.
L’exemple suivant montre une utilisation de la IsPointer
propriété .
using namespace System;
using namespace System::Reflection;
public ref class MyTypeDelegator: public TypeDelegator
{
public:
String^ myElementType;
private:
Type^ myType;
public:
MyTypeDelegator( Type^ myType )
: TypeDelegator( myType )
{
this->myType = myType;
}
protected:
// Override Type::HasElementTypeImpl().
virtual bool HasElementTypeImpl() override
{
// Determine whether the type is an array.
if ( myType->IsArray )
{
myElementType = "array";
return true;
}
// Determine whether the type is a reference.
if ( myType->IsByRef )
{
myElementType = "reference";
return true;
}
// Determine whether the type is a pointer.
if ( myType->IsPointer )
{
myElementType = "pointer";
return true;
}
// Return false if the type is not a reference, array, or pointer type.
return false;
}
};
int main()
{
try
{
int myInt = 0;
array<Int32>^myArray = gcnew array<Int32>(5);
MyTypeDelegator^ myType = gcnew MyTypeDelegator( myArray->GetType() );
// Determine whether myType is an array, pointer, reference type.
Console::WriteLine( "\nDetermine whether a variable is an array, pointer, or reference type.\n" );
if ( myType->HasElementType )
Console::WriteLine( "The type of myArray is {0}.", myType->myElementType );
else
Console::WriteLine( "myArray is not an array, pointer, or reference type." );
myType = gcnew MyTypeDelegator( myInt.GetType() );
// Determine whether myType is an array, pointer, reference type.
if ( myType->HasElementType )
Console::WriteLine( "The type of myInt is {0}.", myType->myElementType );
else
Console::WriteLine( "myInt is not an array, pointer, or reference type." );
}
catch ( Exception^ e )
{
Console::WriteLine( "Exception: {0}", e->Message );
}
}
using System;
using System.Reflection;
public class MyTypeDelegator : TypeDelegator
{
public string myElementType = null;
private Type myType = null ;
public MyTypeDelegator(Type myType) : base(myType)
{
this.myType = myType;
}
// Override Type.HasElementTypeImpl().
protected override bool HasElementTypeImpl()
{
// Determine whether the type is an array.
if(myType.IsArray)
{
myElementType = "array";
return true;
}
// Determine whether the type is a reference.
if(myType.IsByRef)
{
myElementType = "reference";
return true;
}
// Determine whether the type is a pointer.
if(myType.IsPointer)
{
myElementType = "pointer";
return true;
}
// Return false if the type is not a reference, array, or pointer type.
return false;
}
}
public class Type_HasElementTypeImpl
{
public static void Main()
{
try
{
int myInt = 0 ;
int[] myArray = new int[5];
MyTypeDelegator myType = new MyTypeDelegator(myArray.GetType());
// Determine whether myType is an array, pointer, reference type.
Console.WriteLine("\nDetermine whether a variable is an array, pointer, or reference type.\n");
if( myType.HasElementType)
Console.WriteLine("The type of myArray is {0}.", myType.myElementType);
else
Console.WriteLine("myArray is not an array, pointer, or reference type.");
myType = new MyTypeDelegator(myInt.GetType());
// Determine whether myType is an array, pointer, reference type.
if( myType.HasElementType)
Console.WriteLine("The type of myInt is {0}.", myType.myElementType);
else
Console.WriteLine("myInt is not an array, pointer, or reference type.");
}
catch( Exception e )
{
Console.WriteLine("Exception: {0}", e.Message);
}
}
}
open System.Reflection
type MyTypeDelegator(myType) =
inherit TypeDelegator(myType)
[<DefaultValue>]
val mutable public myElementType: string
// Override Type.HasElementTypeImpl().
override this.HasElementTypeImpl() =
// Determine whether the type is an array.
if myType.IsArray then
this.myElementType <- "array"
true
// Determine whether the type is a reference.
elif myType.IsByRef then
this.myElementType <- "reference"
true
// Determine whether the type is a pointer.
elif myType.IsPointer then
this.myElementType <- "pointer"
true
// Return false if the type is not a reference, array, or pointer type.
else false
try
let myInt = 0
let myArray = Array.zeroCreate<int> 5
let myType = MyTypeDelegator(myArray.GetType())
// Determine whether myType is an array, pointer, reference type.
printfn "\nDetermine whether a variable is an array, pointer, or reference type.\n"
if myType.HasElementType then
printfn $"The type of myArray is {myType.myElementType}."
else
printfn "myArray is not an array, pointer, or reference type."
let myType = MyTypeDelegator(myInt.GetType())
// Determine whether myType is an array, pointer, reference type.
if myType.HasElementType then
printfn $"The type of myInt is {myType.myElementType}."
else
printfn "myInt is not an array, pointer, or reference type."
with e ->
printfn $"Exception: {e.Message}"
Imports System.Reflection
Public Class MyTypeDelegator
Inherits TypeDelegator
Public myElementType As String = Nothing
Private myType As Type = Nothing
Public Sub New(ByVal myType As Type)
MyBase.New(myType)
Me.myType = myType
End Sub
' Override Type.HasElementTypeImpl().
Protected Overrides Function HasElementTypeImpl() As Boolean
' Determine whether the type is an array.
If myType.IsArray Then
myElementType = "array"
Return True
End If
' Determine whether the type is a reference.
If myType.IsByRef Then
myElementType = "reference"
Return True
End If
' Determine whether the type is a pointer.
If myType.IsPointer Then
myElementType = "pointer"
Return True
End If
' The type is not a reference, array, or pointer type.
Return False
End Function 'HasElementTypeImpl
End Class
Public Class Type_HasElementTypeImpl
Public Shared Sub Main()
Try
Dim myInt As Integer = 0
Dim myArray(4) As Integer
Dim myType As New MyTypeDelegator(myArray.GetType())
Console.WriteLine(ControlChars.NewLine + "Determine whether a variable refers to an array or pointer or reference type." + ControlChars.NewLine)
' Determine whether myType is an array, pointer, reference type.
If myType.HasElementType Then
Console.WriteLine("The type of myArray is {0}.", myType.myElementType.ToString())
Else
Console.WriteLine("myArray is not an array, pointer, or reference type.")
End If
myType = New MyTypeDelegator(myInt.GetType())
' Determine whether myType is an array, pointer, reference type.
If myType.HasElementType Then
Console.WriteLine("The type of myInt is {0}.", myType.myElementType.ToString())
Else
Console.WriteLine("myInt is not an array, pointer, or reference type.")
End If
Catch e As Exception
Console.WriteLine("Exception: {0}", e.Message.ToString())
End Try
End Sub
End Class
Si le actuel Type représente un type générique ou un paramètre de type dans la définition d’un type générique ou d’une méthode générique, cette propriété retourne false
toujours .
Cette propriété est en lecture seule.
Produit | Versions |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
UWP | 10.0 |
Commentaires sur .NET
.NET est un projet open source. Sélectionnez un lien pour fournir des commentaires :