Rectangle.IsEmpty 属性


测试此 Rectangle 的所有数值属性是否都具有零值。Tests whether all numeric properties of this Rectangle have values of zero.

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



如果此 RectangleWidthHeightXY 属性都具有零值,此属性将返回 true;否则将返回 falseThis property returns true if the Width, Height, X, and Y properties of this Rectangle all have values of zero; otherwise, false.



下面的代码示例演示了 Intersect IsEmptyIntersectsWith 成员。The following code example demonstrates the Intersect, IsEmpty and the IntersectsWith members. 此示例应与 Windows 窗体一起使用。This example should be used with a Windows Form. 将此代码粘贴到窗体中,并在处理窗体事件时调用此方法,并将 Paint e 作为传递 PaintEventArgsPaste this code into a form and call this method when handling the form's Paint event, passing e as PaintEventArgs.

   void InstanceRectangleIntersection( PaintEventArgs^ e )
      Rectangle rectangle1 = Rectangle(50,50,200,100);
      Rectangle rectangle2 = Rectangle(70,20,100,200);
      e->Graphics->DrawRectangle( Pens::Black, rectangle1 );
      e->Graphics->DrawRectangle( Pens::Red, rectangle2 );
      if ( rectangle1.IntersectsWith( rectangle2 ) )
         rectangle1.Intersect( rectangle2 );
         if (  !rectangle1.IsEmpty )
            e->Graphics->FillRectangle( Brushes::Green, rectangle1 );
private void InstanceRectangleIntersection(PaintEventArgs e)

    Rectangle rectangle1 = new Rectangle(50, 50, 200, 100);
    Rectangle rectangle2 = new Rectangle(70, 20, 100, 200);

    e.Graphics.DrawRectangle(Pens.Black, rectangle1);
    e.Graphics.DrawRectangle(Pens.Red, rectangle2);

    if (rectangle1.IntersectsWith(rectangle2))
        if (!rectangle1.IsEmpty)
            e.Graphics.FillRectangle(Brushes.Green, rectangle1);
  Private Sub InstanceRectangleIntersection( _
      ByVal e As PaintEventArgs)

      Dim rectangle1 As New Rectangle(50, 50, 200, 100)
      Dim rectangle2 As New Rectangle(70, 20, 100, 200)

      e.Graphics.DrawRectangle(Pens.Black, rectangle1)
      e.Graphics.DrawRectangle(Pens.Red, rectangle2)

      If (rectangle1.IntersectsWith(rectangle2)) Then
          If Not (rectangle1.IsEmpty) Then
              e.Graphics.FillRectangle(Brushes.Green, rectangle1)
          End If
      End If
  End Sub