FieldInfo.FieldHandle プロパティ

フィールドの内部メタデータ形式を識別するハンドルである RuntimeFieldHandle を取得します。

Public MustOverride ReadOnly Property FieldHandle As _
   RuntimeFieldHandle
[C#]
public abstract RuntimeFieldHandle FieldHandle {get;}
[C++]
public: __property virtual RuntimeFieldHandle get_FieldHandle() = 0;
[JScript]
public abstract function get FieldHandle() : RuntimeFieldHandle;

プロパティ値

フィールドの内部メタデータ形式を識別するハンドル。

解説

ハンドルは取得されたアプリケーション ドメインでだけ有効です。

使用例

[Visual Basic, C#, C++] MyClass.MyField のフィールド情報を取得し、フィールド ハンドルと関連付けられているフィールドを表示する例を次に示します。

 
Imports System
Imports System.Reflection
Imports Microsoft.VisualBasic

Public Class [MyClass]
    Public MyField As String = "Microsoft"
End Class '[MyClass]

Public Class FieldInfo_FieldHandle
    Public Shared Sub Main()
        Dim [myClass] As New [MyClass]()
        ' Get the type of MyClass.
        Dim myType As Type = GetType([MyClass])
        Try
            ' Get the field information of MyField.
            Dim myFieldInfo As FieldInfo = myType.GetField("MyField", BindingFlags.Public Or BindingFlags.Instance)

            ' Determine whether or not the FieldInfo object is null.
            If Not (myFieldInfo Is Nothing) Then
                ' Get the handle for the field.
                Dim myFieldHandle As RuntimeFieldHandle = myFieldInfo.FieldHandle

                DisplayFieldHandle(myFieldHandle)
            Else
                Console.WriteLine("The myFieldInfo object is null.")
            End If
        Catch e As Exception
            Console.WriteLine(" Exception: {0}", e.Message.ToString())
        End Try
    End Sub 'Main

    Public Shared Sub DisplayFieldHandle(ByVal myFieldHandle As RuntimeFieldHandle)
        ' Get the type from the handle.
        Dim myField As FieldInfo = FieldInfo.GetFieldFromHandle(myFieldHandle)
        ' Display the type.
        Console.WriteLine(ControlChars.Cr + "Displaying the field from the handle." + ControlChars.Cr)
        Console.WriteLine("The type is {0}.", myField.ToString())
    End Sub 'DisplayFieldHandle
End Class 'FieldInfo_FieldHandle

[C#] 
using System;
using System.Reflection;
  
public class MyClass
{
    public string MyField = "Microsoft";
}

public class FieldInfo_FieldHandle
{
    public static void Main()
    {
    
        MyClass myClass =new MyClass();

        // Get the type of MyClass.
        Type myType = typeof(MyClass);

        try
        {
            // Get the field information of MyField.
            FieldInfo myFieldInfo = myType.GetField("MyField", BindingFlags.Public 
                | BindingFlags.Instance);
      
            // Determine whether or not the FieldInfo object is null.
            if(myFieldInfo!=null)
            {
                // Get the handle for the field.
                RuntimeFieldHandle myFieldHandle=myFieldInfo.FieldHandle;

                DisplayFieldHandle(myFieldHandle);
            }
            else
            {
                Console.WriteLine("The myFieldInfo object is null.");
            }
        }  
        catch(Exception e)
        {
            Console.WriteLine("Exception: {0}", e.Message);
        }
    }

    public static void DisplayFieldHandle(RuntimeFieldHandle myFieldHandle)
    {
        // Get the type from the handle.
        FieldInfo myField = FieldInfo.GetFieldFromHandle(myFieldHandle);      
      
        // Display the type.
        Console.WriteLine("\nDisplaying the field from the handle.\n");
        Console.WriteLine("The type is {0}.", myField.ToString());
    }
}

[C++] 
#using <mscorlib.dll>

using namespace System;
using namespace System::Reflection;

public __gc class MyClass
{
public:
   String* MyField;
};

void DisplayFieldHandle(RuntimeFieldHandle myFieldHandle)
{
   // Get the type from the handle.
   FieldInfo* myField = FieldInfo::GetFieldFromHandle(myFieldHandle);      

   // Display the type.
   Console::WriteLine(S"\nDisplaying the field from the handle.\n");
   Console::WriteLine(S"The type is {0}.", myField);
}

int main()
{
   MyClass* myClass = new MyClass();

   // Get the type of MyClass.
   Type* myType = __typeof(MyClass);

   try {
      // Get the field information of MyField.
      FieldInfo* myFieldInfo = myType->GetField(S"MyField",
         static_cast<BindingFlags>(BindingFlags::Public | BindingFlags::Instance));

      // Determine whether or not the FieldInfo Object* is 0.
      if (myFieldInfo!=0) {
         // Get the handle for the field.
         RuntimeFieldHandle myFieldHandle=myFieldInfo->FieldHandle;

         DisplayFieldHandle(myFieldHandle);
      } else {
         Console::WriteLine(S"The myFieldInfo Object* is 0.");
      }
   } catch (Exception* e) {
      Console::WriteLine(S"Exception: {0}", e->Message);
   }
}

[JScript] JScript のサンプルはありません。Visual Basic、C#、および C++ のサンプルを表示するには、このページの左上隅にある言語のフィルタ ボタン をクリックします。

必要条件

プラットフォーム: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 ファミリ, .NET Compact Framework - Windows CE .NET

参照

FieldInfo クラス | FieldInfo メンバ | System.Reflection 名前空間