Type.MakeArrayType Metodo

Definizione

Spazio dei nomi:
System
Assembly:
System.Runtime.dll
Assembly:
mscorlib.dll, System.Runtime.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll

Restituisce un oggetto Type che rappresenta una matrice del tipo corrente.Returns a Type object that represents an array of the current type.

Overload

MakeArrayType()

Restituisce un oggetto Type che rappresenta una matrice unidimensionale del tipo corrente, con limite inferiore zero.Returns a Type object representing a one-dimensional array of the current type, with a lower bound of zero.
MakeArrayType(Int32)

Restituisce un oggetto Type che rappresenta una matrice del tipo corrente, con il numero specificato di dimensioni.Returns a Type object representing an array of the current type, with the specified number of dimensions.

Esempio

Nell'esempio di codice seguente vengono creati la matrice, ref ( ByRef in Visual Basic) e i tipi di puntatore per la Test classe.The following code example creates array, ref (ByRef in Visual Basic), and pointer types for the Test class.

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*

 */

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*

MakeArrayType()

Restituisce un oggetto Type che rappresenta una matrice unidimensionale del tipo corrente, con limite inferiore zero.Returns a Type object representing a one-dimensional array of the current type, with a lower bound of zero.

public:
 abstract Type ^ MakeArrayType();
public:
 virtual Type ^ MakeArrayType();
public abstract Type MakeArrayType ();
public virtual Type MakeArrayType ();
abstract member MakeArrayType : unit -> Type
abstract member MakeArrayType : unit -> Type
override this.MakeArrayType : unit -> Type
Public MustOverride Function MakeArrayType () As Type
Public Overridable Function MakeArrayType () As Type

Restituisce

Type

Oggetto Type che rappresenta una matrice unidimensionale del tipo corrente, con limite inferiore zero.A Type object representing a one-dimensional array of the current type, with a lower bound of zero.

Eccezioni

NotSupportedException

Il metodo richiamato non è supportato nella classe base.The invoked method is not supported in the base class. Le classi derivate devono fornire un'implementazione.Derived classes must provide an implementation.

TypeLoadException

Il tipo corrente è TypedReference.The current type is TypedReference.

-oppure--or- Il tipo corrente è ByRef,The current type is a ByRef type. Ciò significa che IsByRef restituisce true.That is, IsByRef returns true.

Commenti

Il MakeArrayType metodo fornisce un modo per generare tipi di matrice i cui tipi di elemento vengono calcolati in fase di esecuzione.The MakeArrayType method provides a way to generate array types whose element types are computed at run time.

Nota Il Common Language Runtime distingue tra i vettori, ovvero le matrici unidimensionali che sono sempre in base zero, e le matrici multidimensionali.Note The common language runtime makes a distinction between vectors (that is, one-dimensional arrays that are always zero-based) and multidimensional arrays. Un vettore, che ha sempre una sola dimensione, non è uguale a una matrice multidimensionale che ha una sola dimensione.A vector, which always has only one dimension, is not the same as a multidimensional array that happens to have only one dimension. Questo overload del metodo può essere usato solo per creare tipi di vettore ed è l'unico modo per creare un tipo di vettore.This method overload can only be used to create vector types, and it is the only way to create a vector type. Utilizzare l' MakeArrayType(Int32) Overload del metodo per creare tipi di matrici multidimensionali.Use the MakeArrayType(Int32) method overload to create multidimensional array types.

Vedi anche

Si applica a

MakeArrayType(Int32)

Restituisce un oggetto Type che rappresenta una matrice del tipo corrente, con il numero specificato di dimensioni.Returns a Type object representing an array of the current type, with the specified number of dimensions.

public:
 abstract Type ^ MakeArrayType(int rank);
public:
 virtual Type ^ MakeArrayType(int rank);
public abstract Type MakeArrayType (int rank);
public virtual Type MakeArrayType (int rank);
abstract member MakeArrayType : int -> Type
abstract member MakeArrayType : int -> Type
override this.MakeArrayType : int -> Type
Public MustOverride Function MakeArrayType (rank As Integer) As Type
Public Overridable Function MakeArrayType (rank As Integer) As Type

Parametri

rank
Int32

Numero di dimensioni della matrice.The number of dimensions for the array. Il numero deve essere minore o uguale a 32.This number must be less than or equal to 32.

Restituisce

Type

Oggetto che rappresenta una matrice del tipo corrente, con il numero specificato di dimensioni.An object representing an array of the current type, with the specified number of dimensions.

Eccezioni

IndexOutOfRangeException

rank non è valido.rank is invalid. Ad esempio, 0 o negativo.For example, 0 or negative.

NotSupportedException

Il metodo richiamato non è supportato nella classe base.The invoked method is not supported in the base class.

TypeLoadException

Il tipo corrente è TypedReference.The current type is TypedReference.

-oppure--or- Il tipo corrente è ByRef,The current type is a ByRef type. Ciò significa che IsByRef restituisce true.That is, IsByRef returns true.

-oppure--or- rank è maggiore di 32.rank is greater than 32.

Commenti

Il MakeArrayType metodo fornisce un modo per generare tipi di matrice i cui tipi di elemento vengono calcolati in fase di esecuzione.The MakeArrayType method provides a way to generate array types whose element types are computed at run time.

Nota

Il Common Language Runtime distingue tra i vettori, ovvero le matrici unidimensionali che sono sempre in base zero, e le matrici multidimensionali.The common language runtime makes a distinction between vectors (that is, one-dimensional arrays that are always zero-based) and multidimensional arrays. Un vettore, che ha sempre una sola dimensione, non è uguale a una matrice multidimensionale che ha una sola dimensione.A vector, which always has only one dimension, is not the same as a multidimensional array that happens to have only one dimension. Non è possibile usare questo overload del metodo per creare un tipo di vettore; Se rank è 1, questo overload del metodo restituisce un tipo di matrice multidimensionale che ha una dimensione.You cannot use this method overload to create a vector type; if rank is 1, this method overload returns a multidimensional array type that happens to have one dimension. Usare l' MakeArrayType() Overload del metodo per creare tipi di vettore.Use the MakeArrayType() method overload to create vector types.

Vedi anche

Si applica a