ControlCollection.IsReadOnly Properti

Definisi

Ruang nama:

System.Web.UI

Rakitan:

System.Web.dll

Mendapatkan nilai yang menunjukkan apakah ControlCollection objek bersifat baca-saja.

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

public bool IsReadOnly { get; }

member this.IsReadOnly : bool

Public ReadOnly Property IsReadOnly As Boolean

Nilai Properti

Boolean

true jika kontrol bersifat baca-saja; jika tidak, false. Defaultnya adalah false.

Contoh

Contoh kode berikut membuat metode yang menghitung melalui ControlCollection kumpulan Button kontrol, myButton. Ketika enumerator dibuat, IsSynchronized properti diperiksa untuk melihat apakah operasi aman, dan jika tidak, SyncRoot properti digunakan untuk mendapatkan objek untuk membuat utas operasi aman. Ketika enumerasi selesai, nilai IsReadOnly properti ditulis sebagai Text properti Label kontrol pada halaman yang berisi.

// Create a method that enuberates through a 
// button//s ControlCollection in a thread-safe manner.  
public void ListControlCollection(object sender, EventArgs e)
{
   IEnumerator myEnumerator = myButton.Controls.GetEnumerator();

   // Check the IsSynchronized property. If False,
   // use the SyncRoot method to get an object that 
   // allows the enumeration of all controls to be 
   // thread safe.
   if (!myButton.Controls.IsSynchronized)
   {
       lock (myButton.Controls.SyncRoot)
       {
           while (myEnumerator.MoveNext())
           {

               Object myObject = myEnumerator.Current;

               LiteralControl childControl = (LiteralControl)myEnumerator.Current;
               Response.Write("<b><br /> This is the  text of the child Control  </b>: " +
                              childControl.Text);
           }
           msgReadOnly.Text = myButton.Controls.IsReadOnly.ToString();
       }
   }       
}

' Create a method that enuberates through a 
' button's ControlCollection in a thread-safe manner.  
Public Sub ListControlCollection(sender As Object, e As EventArgs)
   Dim myEnumerator As IEnumerator = myButton.Controls.GetEnumerator()

   ' Check the IsSynchronized property. If False,
   ' use the SyncRoot method to get an object that 
   ' allows the enumeration of all controls to be 
   ' thread safe.
   If myButton.Controls.IsSynchronized = False Then
     SyncLock myButton.Controls.SyncRoot
       While (myEnumerator.MoveNext())

       Dim myObject As Object  = myEnumerator.Current
           
         Dim childControl As LiteralControl = CType(myEnumerator.Current, LiteralControl)
         Response.Write("<b><br /> This is the  text of the child Control  </b>: " & _
                        childControl.Text)
       End While
      msgReadOnly.Text = myButton.Controls.IsReadOnly.ToString()
      
      End SyncLock
   End If       
 End Sub

Lihat juga

• Controls