FieldInfo.IsStatic Vlastnost

Definice

Obor názvů:

System.Reflection

Sestavení:

System.Runtime.dll

Zdroj:

FieldInfo.cs

Získá hodnotu označující, zda je pole statické.

public:
 property bool IsStatic { bool get(); };

public bool IsStatic { get; }

member this.IsStatic : bool

Public ReadOnly Property IsStatic As Boolean

Hodnota vlastnosti

Boolean

truepokud je toto pole statické; v opačném případě . false

Příklady

Následující příklad určuje, zda je zadané pole statické, a zobrazí výsledek.

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

Výsledkem tohoto kódu je následující výstup:

Reflection.FieldInfo

Myfielda - A private field; IsStatic - False

Myfieldb - B static field; IsStatic - True

Poznámky

Pokud je pole statické, je jedna kopie pole sdílena všemi instancemi tohoto typu.

Vlastnost IsStatic je nastavena při nastavení atributu FieldAttributes.Static .

Pokud chcete získat IsStatic vlastnost, nejprve získáte třídu Type. Z nástroje Typezískejte .FieldInfo Z objektu FieldInfozískejte IsStatic vlastnost . Pokud chcete získat přístup k neveřejné poli, nastavte BindingFlags v GetField metodě hodnotu to NonPublic a nastavte přístupnost na Instance nebo Static.

Viz také

• FieldAttributes
• GetField(String, BindingFlags)
• Type