FieldInfo.IsStatic FieldInfo.IsStatic FieldInfo.IsStatic FieldInfo.IsStatic Property

Definizione

Ottiene un valore che indica se il campo è statico.Gets a value indicating whether the field is static.

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

Valore della proprietà

true se il campo è statico; in caso contrario,false.true if this field is static; otherwise, false.

Implementazioni

Esempi

Nell'esempio seguente viene determinato se il campo specificato è statico e viene visualizzato il risultato.The following example determines whether the specified field is static and displays the result.

using namespace System;
using namespace System::Reflection;

// Make two fields.
public ref class Myfielda
{
private:
   String^ field;

public:
   Myfielda()
      : field( "A private field" )
   {}


   property String^ Field 
   {
      String^ get()
      {
         return field;
      }

      void set( String^ value )
      {
         if ( field != value )
         {
            field = value;
         }
      }

   }

};

public ref class Myfieldb
{
private:
   static String^ field = "B static field";

public:

   property String^ Field 
   {
      String^ get()
      {
         return field;
      }

      void set( String^ value )
      {
         if ( field != value )
         {
            field = value;
         }
      }

   }

};

int main()
{
   Console::WriteLine( "\nReflection.FieldInfo" );
   Myfielda^ myfielda = gcnew Myfielda;
   Myfieldb^ myfieldb = gcnew Myfieldb;
   
   // Get the Type and FieldInfo.
   Type^ MyTypea = Type::GetType( "Myfielda" );
   FieldInfo^ Myfieldinfoa = MyTypea->GetField( "field", static_cast<BindingFlags>(BindingFlags::NonPublic | BindingFlags::Instance) );
   Type^ MyTypeb = Type::GetType( "Myfieldb" );
   FieldInfo^ Myfieldinfob = MyTypeb->GetField( "field", static_cast<BindingFlags>(BindingFlags::NonPublic | BindingFlags::Static) );
   
   // For the first field, get and display the name, field, and IsStatic property value.
   Console::Write( "\n{0} - ", MyTypea->FullName );
   Console::Write( "{0}; ", Myfieldinfoa->GetValue( myfielda ) );
   Console::Write( "IsStatic - {0}", Myfieldinfoa->IsStatic );
   
   // For the second field get and display the name, field, and IsStatic property value.
   Console::Write( "\n{0} - ", MyTypeb->FullName );
   Console::Write( "{0}; ", Myfieldinfob->GetValue( myfieldb ) );
   Console::Write( "IsStatic - {0}", Myfieldinfob->IsStatic );
   return 0;
}

using System;
using System.Reflection;

 // Make two fields.
public class Myfielda
{
    private string field = "A private field";
    public string Field
    {
        get{return field;}
        set{if(field!=value){field=value;}}
    }
}
public class Myfieldb
{
    static string field = "B private static field";
    public string Field 
    {
        get{return field;}
        set{if(field!=value){field=value;}}
    }
}
  
public class Myfieldinfo
{
    public static int Main()
    {
        Console.WriteLine("\nReflection.FieldInfo");
        Myfielda Myfielda = new Myfielda();
        Myfieldb Myfieldb = new Myfieldb();
  
        // Get the Type and FieldInfo.
        Type MyTypea = typeof(Myfielda);
        FieldInfo Myfieldinfoa = MyTypea.GetField("field", BindingFlags.NonPublic|BindingFlags.Instance);
        Type MyTypeb = typeof(Myfieldb);
        FieldInfo Myfieldinfob = MyTypeb.GetField("field", BindingFlags.NonPublic|BindingFlags.Static);
  
        // For the first field, get and display the name, field, and IsStatic property value.
        Console.Write("\n{0} - ", MyTypea.FullName);
        Console.Write("{0}; ", Myfieldinfoa.GetValue(Myfielda));
        Console.Write("IsStatic - {0}", Myfieldinfoa.IsStatic);
  
        // For the second field get and display the name, field, and IsStatic property value.
        Console.Write("\n{0} - ", MyTypeb.FullName);
        Console.Write("{0}; ", Myfieldinfob.GetValue(Myfieldb));
        Console.Write("IsStatic - {0}", Myfieldinfob.IsStatic);
  
        return 0;
    }
}
Imports System.Reflection

' Make two fields.
Public Class Myfielda
    Private m_field As String = "A private field"

    Public Property Field() As String
        Get
            Return m_field
        End Get
        Set(ByVal Value As String)
            If m_field <> value Then
                m_field = value
            End If
        End Set
    End Property
End Class

Public Class Myfieldb
    Private Shared m_field As String = "B private static field"

    Public Property Field() As String
        Get
            Return m_field
        End Get
        Set(ByVal Value As String)
            If m_field <> value Then
                m_field = value
            End If
        End Set
    End Property
End Class

Public Class Myfieldinfo

    Public Shared Sub Main()
        Console.WriteLine()
        Console.WriteLine("Reflection.FieldInfo")
        Console.WriteLine()
        Dim Myfielda As New Myfielda()
        Dim Myfieldb As New Myfieldb()

        ' Get the Type and FieldInfo.
        Dim MyTypea As Type = GetType(Myfielda)
        Dim Myfieldinfoa As FieldInfo = _
           MyTypea.GetField("m_field", BindingFlags.NonPublic Or BindingFlags.Instance)
        Dim MyTypeb As Type = GetType(Myfieldb)
        Dim Myfieldinfob As FieldInfo = _
           MyTypeb.GetField("m_field", BindingFlags.NonPublic Or BindingFlags.Static)

        ' For the first field, get and display the name, field, and IsStatic property value.
        Console.WriteLine("{0} - {1}; IsStatic - {2}", MyTypea.FullName, Myfieldinfoa.GetValue(Myfielda), Myfieldinfoa.IsStatic)

        ' For the second field, get and display the name, field, and IsStatic property value.
        Console.WriteLine("{0} - {1}; IsStatic - {2}", MyTypeb.FullName, Myfieldinfob.GetValue(Myfieldb), Myfieldinfob.IsStatic)

    End Sub
End Class

L'output del codice è il seguente:This code produces the following output:

Reflection.FieldInfoReflection.FieldInfo

FieldA-campo privato; Static-falseMyfielda - A private field; IsStatic - False

Myfieldb-B campo statico; Static-trueMyfieldb - B static field; IsStatic - True

Commenti

Quando un campo è statico, una copia del campo viene condivisa da tutte le istanze del tipo.When a field is static, one copy of the field is shared by all instances of the type.

La IsStatic proprietà viene impostata quando l' FieldAttributes.Static attributo è impostato.The IsStatic property is set when the FieldAttributes.Static attribute is set.

Per ottenere la IsStatic proprietà, ottenere prima di tutto Typela classe.To get the IsStatic property, first get the class Type. Type DaFieldInfoottenere.From the Type, get the FieldInfo. Da ottenere la IsStaticProprietà. FieldInfoFrom the FieldInfo, get the IsStatic property. Per accedere a un campo non pubblico, impostare BindingFlags su NonPublic nel GetField metodo e impostare l'accessibilità su o Instance Staticsu.To access a non-public field, set the BindingFlags to NonPublic in the GetField method and set the accessibility to Instance or Static.

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