Type.MakePointerType 方法
定義
重要
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傳回 Type 物件，代表指向目前類型的指標。
public:
abstract Type ^ MakePointerType();public:
virtual Type ^ MakePointerType();public abstract Type MakePointerType ();public virtual Type MakePointerType ();abstract member MakePointerType : unit -> Typeabstract member MakePointerType : unit -> Type
override this.MakePointerType : unit -> TypePublic MustOverride Function MakePointerType () As TypePublic Overridable Function MakePointerType () As Type傳回
Type 物件，代表指向目前類型的指標。
例外狀況
基底類別不支援叫用的方法。
範例
下列程式碼範例會在 Visual Basic) 和 類別的指標類型 Test 中建立陣列、 ref (ByRef 。
using namespace System;
using namespace System::Reflection;
public ref class Example
{
public:
static void Main()
{
// Create a Type object that represents a one-dimensional
// array of Example objects.
Type^ t = Example::typeid->MakeArrayType();
Console::WriteLine( L"\r\nArray of Example: {0}", t );
// Create a Type object that represents a two-dimensional
// array of Example objects.
t = Example::typeid->MakeArrayType( 2 );
Console::WriteLine( L"\r\nTwo-dimensional array of Example: {0}", t );
// Demonstrate an exception when an invalid array rank is
// specified.
try
{
t = Example::typeid->MakeArrayType( -1 );
}
catch ( Exception^ ex )
{
Console::WriteLine( L"\r\n{0}", ex );
}
// Create a Type object that represents a ByRef parameter
// of type Example.
t = Example::typeid->MakeByRefType();
Console::WriteLine( L"\r\nByRef Example: {0}", t );
// Get a Type object representing the Example class, a
// MethodInfo representing the "Test" method, a ParameterInfo
// representing the parameter of type Example, and finally
// a Type object representing the type of this ByRef parameter.
// Compare this Type object with the Type object created using
// MakeByRefType.
Type^ t2 = Example::typeid;
MethodInfo^ mi = t2->GetMethod( L"Test" );
ParameterInfo^ pi = mi->GetParameters()[ 0 ];
Type^ pt = pi->ParameterType;
Console::WriteLine( L"Are the ByRef types equal? {0}", (t == pt) );
// Create a Type object that represents a pointer to an
// Example object.
t = Example::typeid->MakePointerType();
Console::WriteLine( L"\r\nPointer to Example: {0}", t );
}
// A sample method with a ByRef parameter.
//
void Test( interior_ptr<Example^> /*e*/ )
{
}
};
int main()
{
Example::Main();
}
/* This example produces output similar to the following:
Array of Example: Example[]
Two-dimensional array of Example: Example[,]
System.IndexOutOfRangeException: Index was outside the bounds of the array.
at System.RuntimeType.MakeArrayType(Int32 rank) in c:\vbl\ndp\clr\src\BCL\System\RtType.cs:line 2999
at Example.Main()
ByRef Example: Example&
Are the ByRef types equal? True
Pointer to Example: Example*
*/
using System;
using System.Reflection;
public class Example
{
public static void Main()
{
// Create a Type object that represents a one-dimensional
// array of Example objects.
Type t = typeof(Example).MakeArrayType();
Console.WriteLine("\r\nArray of Example: {0}", t);
// Create a Type object that represents a two-dimensional
// array of Example objects.
t = typeof(Example).MakeArrayType(2);
Console.WriteLine("\r\nTwo-dimensional array of Example: {0}", t);
// Demonstrate an exception when an invalid array rank is
// specified.
try
{
t = typeof(Example).MakeArrayType(-1);
}
catch(Exception ex)
{
Console.WriteLine("\r\n{0}", ex);
}
// Create a Type object that represents a ByRef parameter
// of type Example.
t = typeof(Example).MakeByRefType();
Console.WriteLine("\r\nByRef Example: {0}", t);
// Get a Type object representing the Example class, a
// MethodInfo representing the "Test" method, a ParameterInfo
// representing the parameter of type Example, and finally
// a Type object representing the type of this ByRef parameter.
// Compare this Type object with the Type object created using
// MakeByRefType.
Type t2 = typeof(Example);
MethodInfo mi = t2.GetMethod("Test");
ParameterInfo pi = mi.GetParameters()[0];
Type pt = pi.ParameterType;
Console.WriteLine("Are the ByRef types equal? {0}", (t == pt));
// Create a Type object that represents a pointer to an
// Example object.
t = typeof(Example).MakePointerType();
Console.WriteLine("\r\nPointer to Example: {0}", t);
}
// A sample method with a ByRef parameter.
//
public void Test(ref Example e)
{
}
}
/* This example produces output similar to the following:
Array of Example: Example[]
Two-dimensional array of Example: Example[,]
System.IndexOutOfRangeException: Index was outside the bounds of the array.
at System.RuntimeType.MakeArrayType(Int32 rank) in c:\vbl\ndp\clr\src\BCL\System\RtType.cs:line 2999
at Example.Main()
ByRef Example: Example&
Are the ByRef types equal? True
Pointer to Example: Example*
*/
type Example() =
// A sample method with a ByRef parameter.
member _.Test(e: Example byref) = ()
do
// Create a Type object that represents a one-dimensional
// array of Example objects.
let t = typeof<Example>.MakeArrayType()
printfn $"\r\nArray of Example: {t}"
// Create a Type object that represents a two-dimensional
// array of Example objects.
let t = typeof<Example>.MakeArrayType 2
printfn $"\r\nTwo-dimensional array of Example: {t}"
// Demonstrate an exception when an invalid array rank is
// specified.
try
let t = typeof<Example>.MakeArrayType -1
()
with ex ->
printfn $"\r\n{ex}"
// Create a Type object that represents a ByRef parameter
// of type Example.
let t = typeof<Example>.MakeByRefType()
printfn $"\r\nByRef Example: {t}"
// Get a Type object representing the Example class, a
// MethodInfo representing the "Test" method, a ParameterInfo
// representing the parameter of type Example, and finally
// a Type object representing the type of this ByRef parameter.
// Compare this Type object with the Type object created using
// MakeByRefType.
let t2 = typeof<Example>
let mi = t2.GetMethod "Test"
let pi = mi.GetParameters()[0]
let pt = pi.ParameterType
printfn $"Are the ByRef types equal? {t = pt}"
// Create a Type object that represents a pointer to an
// Example object.
let t = typeof<Example>.MakePointerType()
printfn $"\r\nPointer to Example: {t}"
(* This example produces output similar to the following:
Array of Example: Example[]
Two-dimensional array of Example: Example[,]
System.IndexOutOfRangeException: Index was outside the bounds of the array.
at System.RuntimeType.MakeArrayType(Int32 rank) in c:\vbl\ndp\clr\src\BCL\System\RtType.cs:line 2999
at Example.Main()
ByRef Example: Example&
Are the ByRef types equal? True
Pointer to Example: Example*
*)
Imports System.Reflection
Public Class Example
Public Shared Sub Main()
' Create a Type object that represents a one-dimensional
' array of Example objects.
Dim t As Type = GetType(Example).MakeArrayType()
Console.WriteLine(vbCrLf & "Array of Example: " & t.ToString())
' Create a Type object that represents a two-dimensional
' array of Example objects.
t = GetType(Example).MakeArrayType(2)
Console.WriteLine(vbCrLf & "Two-dimensional array of Example: " & t.ToString())
' Demonstrate an exception when an invalid array rank is
' specified.
Try
t = GetType(Example).MakeArrayType(-1)
Catch ex As Exception
Console.WriteLine(vbCrLf & ex.ToString())
End Try
' Create a Type object that represents a ByRef parameter
' of type Example.
t = GetType(Example).MakeByRefType()
Console.WriteLine(vbCrLf & "ByRef Example: " & t.ToString())
' Get a Type object representing the Example class, a
' MethodInfo representing the "Test" method, a ParameterInfo
' representing the parameter of type Example, and finally
' a Type object representing the type of this ByRef parameter.
' Compare this Type object with the Type object created using
' MakeByRefType.
Dim t2 As Type = GetType(Example)
Dim mi As MethodInfo = t2.GetMethod("Test")
Dim pi As ParameterInfo = mi.GetParameters()(0)
Dim pt As Type = pi.ParameterType
Console.WriteLine("Are the ByRef types equal? " & (t Is pt))
' Create a Type object that represents a pointer to an
' Example object.
t = GetType(Example).MakePointerType()
Console.WriteLine(vbCrLf & "Pointer to Example: " & t.ToString())
End Sub
' A sample method with a ByRef parameter.
'
Public Sub Test(ByRef e As Example)
End Sub
End Class
' This example produces output similar to the following:
'
'Array of Example: Example[]
'
'Two-dimensional array of Example: Example[,]
'
'System.IndexOutOfRangeException: Index was outside the bounds of the array.
' at System.RuntimeType.MakeArrayType(Int32 rank) in c:\vbl\ndp\clr\src\BCL\System\RtType.cs:line 2999
' at Example.Main()
'
'ByRef Example: Example&
'Are the ByRef types equal? True
'
'Pointer to Example: Example*
備註
方法 MakePointerType 提供方法來產生參數清單的指標類型。
如果使用Microsoft中繼語言的語法 (MSIL) ，如果目前的 Type 物件代表 Int32 ，這個方法會 Type 傳回代表 Int32* 的 物件。
