Type.HasElementType Type.HasElementType Type.HasElementType Type.HasElementType Property

定義

現在の Type が別の型を包含または参照しているかどうか、つまり現在の Type が配列、ポインター、または参照渡しかどうかを示す値を取得します。Gets a value indicating whether the current Type encompasses or refers to another type; that is, whether the current Type is an array, a pointer, or is passed by reference.

public:
 property bool HasElementType { bool get(); };
public bool HasElementType { get; }
member this.HasElementType : bool
Public ReadOnly Property HasElementType As Boolean

プロパティ値

true が配列やポインターであるか、参照渡しである場合は Type。それ以外の場合は falsetrue if the Type is an array, a pointer, or is passed by reference; otherwise, false.

実装

次の例を返しますtrueまたはfalseオブジェクトは、配列、参照型またはポインターかどうかによって異なります。The following example returns true or false depending on whether or not the object is an array, a reference type, or a pointer.

using namespace System;
using namespace System::Reflection;
using namespace System::Runtime::InteropServices;

public ref class Example
{
public:
    // This method is for demonstration purposes. It includes a
    // tracking reference (C# ref, VB ByRef), an out parameter,
    // and a pointer.
    void Test(int% x, [OutAttribute()] int% y, int* z)
    { 
        *z = x = y = 0; 
    }    
};

int main()
{
    // All of the following display 'True'.

    // Define a managed array, get its type, and display HasElementType. 
    array<Example^>^ examples = {gcnew Example(), gcnew Example()};
    Type^ t = examples::typeid; 
    Console::WriteLine(t);
    Console::WriteLine("HasElementType is '{0}' for managed array types.", t->HasElementType);

    // When you use Reflection Emit to emit dynamic methods and
    // assemblies, you can create array types using MakeArrayType.
    // The following creates the type 'array of Example'.
    t = Example::typeid->MakeArrayType();
    Console::WriteLine("HasElementType is '{0}' for managed array types.", t->HasElementType);

    // When you reflect over methods, HasElementType is true for
    // ref, out, and pointer parameter types. The following 
    // gets the Test method, defined above, and examines its
    // parameters.
    MethodInfo^ mi = Example::typeid->GetMethod("Test");
    array<ParameterInfo^>^ parms = mi->GetParameters();
    t = parms[0]->ParameterType;
    Console::WriteLine("HasElementType is '{0}' for ref parameter types.", t->HasElementType);
    t = parms[1]->ParameterType;
    Console::WriteLine("HasElementType is '{0}' for out parameter types.", t->HasElementType);
    t = parms[2]->ParameterType;
    Console::WriteLine("HasElementType is '{0}' for pointer parameter types.", t->HasElementType);

    // When you use Reflection Emit to emit dynamic methods and
    // assemblies, you can create pointer and ByRef types to use
    // when you define method parameters.
    t = Example::typeid->MakePointerType();
    Console::WriteLine("HasElementType is '{0}' for pointer types.", t->HasElementType);
    t = Example::typeid->MakeByRefType();
    Console::WriteLine("HasElementType is '{0}' for ByRef types.", t->HasElementType);
}
// This code must be compiled with the /unsafe switch:
//   csc /unsafe source.cs
using System;
using System.Reflection;

public class Example
{
    // This method is for demonstration purposes.
    unsafe public void Test(ref int x, out int y, int* z) 
    { 
        *z = x = y = 0; 
    }

    public static void Main()
    {
        // All of the following display 'True'.

        // Define an array, get its type, and display HasElementType. 
        int[] nums = {1, 1, 2, 3, 5, 8, 13};
        Type t = nums.GetType();
        Console.WriteLine("HasElementType is '{0}' for array types.", t.HasElementType);

        // Test an array type without defining an array.
        t = typeof(Example[]);
        Console.WriteLine("HasElementType is '{0}' for array types.", t.HasElementType);

        // When you use Reflection Emit to emit dynamic methods and
        // assemblies, you can create array types using MakeArrayType.
        // The following creates the type 'array of Example'.
        t = typeof(Example).MakeArrayType();
        Console.WriteLine("HasElementType is '{0}' for array types.", t.HasElementType);

        // When you reflect over methods, HasElementType is true for
        // ref, out, and pointer parameter types. The following 
        // gets the Test method, defined above, and examines its
        // parameters.
        MethodInfo mi = typeof(Example).GetMethod("Test");
        ParameterInfo[] parms = mi.GetParameters();
        t = parms[0].ParameterType;
        Console.WriteLine("HasElementType is '{0}' for ref parameter types.", t.HasElementType);
        t = parms[1].ParameterType;
        Console.WriteLine("HasElementType is '{0}' for out parameter types.", t.HasElementType);
        t = parms[2].ParameterType;
        Console.WriteLine("HasElementType is '{0}' for pointer parameter types.", t.HasElementType);

        // When you use Reflection Emit to emit dynamic methods and
        // assemblies, you can create pointer and ByRef types to use
        // when you define method parameters.
        t = typeof(Example).MakePointerType();
        Console.WriteLine("HasElementType is '{0}' for pointer types.", t.HasElementType);
        t = typeof(Example).MakeByRefType();
        Console.WriteLine("HasElementType is '{0}' for ByRef types.", t.HasElementType);
    }
}
Imports System
Imports System.Reflection
Imports System.Runtime.InteropServices

Public Class Example

    ' This method is for demonstration purposes.
    Public Shared Sub Test(ByRef x As Integer, <Out> ByRef y As Integer)
    End Sub

    Public Shared Sub Main()
        ' All of the following display 'True'.

        ' Define an array, get its type, and display HasElementType. 
        Dim nums() As Integer = {1, 1, 2, 3, 5, 8, 13}
        Dim t As Type = nums.GetType()
        Console.WriteLine("HasElementType is '{0}' for array types.", t.HasElementType)

        ' Test an array type without defining an array.
        t = GetType(Example())
        Console.WriteLine("HasElementType is '{0}' for array types.", t.HasElementType)

        ' When you use Reflection Emit to emit dynamic methods and
        ' assemblies, you can create array types using MakeArrayType.
        ' The following creates the type 'array of Example'.
        t = GetType(Example).MakeArrayType()
        Console.WriteLine("HasElementType is '{0}' for array types.", t.HasElementType)

        ' When you reflect over methods, HasElementType is true for
        ' ref, out, and pointer parameter types. The following 
        ' gets the Test method, defined above, and examines its
        ' parameters.
        Dim mi As MethodInfo = GetType(Example).GetMethod("Test")
        Dim parms() As ParameterInfo = mi.GetParameters()
        t = parms(0).ParameterType
        Console.WriteLine("HasElementType is '{0}' for ref parameter types.", t.HasElementType)
        t = parms(1).ParameterType
        Console.WriteLine("HasElementType is '{0}' for <Out> parameter types.", t.HasElementType)

        ' When you use Reflection Emit to emit dynamic methods and
        ' assemblies, you can create pointer and ByRef types to use
        ' when you define method parameters.
        t = GetType(Example).MakePointerType()
        Console.WriteLine("HasElementType is '{0}' for pointer types.", t.HasElementType)
        t = GetType(Example).MakeByRefType()
        Console.WriteLine("HasElementType is '{0}' for ByRef types.", t.HasElementType)
    End Sub 

End Class

注釈

For example, Type.GetType("Int32[]").HasElementType returns true, but Type.GetType("Int32").HasElementType returns false.For example, Type.GetType("Int32[]").HasElementType returns true, but Type.GetType("Int32").HasElementType returns false. HasElementType も返しますtrueの「Int32 *」と"Int32 (& a)"。HasElementType also returns true for "Int32*" and "Int32&".

場合、現在Type常にこのプロパティを返します、ジェネリック型またはジェネリック型またはジェネリック メソッドの定義の型パラメーターを表すfalseします。If the current Type represents a generic type, or a type parameter in the definition of a generic type or generic method, this property always returns false.

適用対象

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