BindingManagerBase.Position 属性

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

当在派生类中被重写时，获取或设置绑定到该数据源的控件所指向的基础列表中的位置。

public:
 abstract property int Position { int get(); void set(int value); };

public abstract int Position { get; set; }

member this.Position : int with get, set

Public MustOverride Property Position As Integer

属性值

Int32

指定基础列表中某个位置的从零开始的索引。

示例

下面的代码示例演示了设置 属性的 Position 四种方法。 方法 MoveNext 将 属性递增 1。 方法 MovePrevious 将 属性递减 1。 方法 MoveFirst 将 属性设置为 0，方法 MoveLast 将 属性设置为属性的值 Count 减 1。

private:
   void BindingManagerBase_CurrentChanged( Object^ sender, EventArgs^ /*e*/ )
   {
      // Print the new value of the current object.
      Console::Write( "Current Changed: " );
      Console::WriteLine( ( (BindingManagerBase^)(sender) )->Current );
   }

   void MoveNext()
   {
      // Increment the Position property value by one.
      myBindingManagerBase->Position = myBindingManagerBase->Position + 1;
   }

   void MovePrevious()
   {
      // Decrement the Position property value by one.
      myBindingManagerBase->Position = myBindingManagerBase->Position - 1;
   }

   void MoveFirst()
   {
      // Go to the first item in the list.
      myBindingManagerBase->Position = 0;
   }

   void MoveLast()
   {
      // Go to the last row in the list.
      myBindingManagerBase->Position = myBindingManagerBase->Count - 1;
   }

private void BindingManagerBase_CurrentChanged
(object sender, EventArgs e)
{
   // Print the new value of the current object.
   Console.Write("Current Changed: ");
   Console.WriteLine(((BindingManagerBase)sender).Current);
}

private void MoveNext()
{
   // Increment the Position property value by one.
   myBindingManagerBase.Position += 1;
}

private void MovePrevious()
{
   // Decrement the Position property value by one.
   myBindingManagerBase.Position -= 1;
}

private void MoveFirst()
{
   // Go to the first item in the list.
   myBindingManagerBase.Position = 0;
}

private void MoveLast()
{
   // Go to the last row in the list.
   myBindingManagerBase.Position = 
   myBindingManagerBase.Count - 1;
}

Private Sub BindingManagerBase_CurrentChanged(sender As Object, e As EventArgs)
    ' Print the new value of the current object.
    Console.Write("Current Changed: ")
    Console.WriteLine(CType(sender, BindingManagerBase).Current)
End Sub


Private Sub MoveNext()
    ' Increment the Position property value by one.
    myBindingManagerBase.Position += 1
End Sub


Private Sub MovePrevious()
    ' Decrement the Position property value by one.
    myBindingManagerBase.Position -= 1
End Sub


Private Sub MoveFirst()
    ' Go to the first item in the list.
    myBindingManagerBase.Position = 0
End Sub


Private Sub MoveLast()
    ' Go to the last row in the list.
    myBindingManagerBase.Position = myBindingManagerBase.Count - 1
End Sub

注解

Position使用 属性循环访问 由 BindingManagerBase维护的基础列表。 若要转到第一项，请将 Position 设置为 0。 若要转到列表的末尾，请将 Position 设置为 属性的值 Count 减去 1。

属性值 PositionChanged 更改时 Position 发生 该事件。

另请参阅

• PositionChanged
• Current
• Count