Region.Dispose 方法

定義

命名空間:

System.Drawing

組件:

System.Drawing.Common.dll

套件:

System.Drawing.Common v8.0.0

來源:

Region.cs

釋放這個 Region 所使用的所有資源。

public:
 virtual void Dispose();

public void Dispose ();

abstract member Dispose : unit -> unit
override this.Dispose : unit -> unit

Public Sub Dispose ()

實作

Dispose()

範例

下列程式碼範例示範建 Region 構函式和 Exclude 和 Dispose 方法。

此範例的設計目的是要與Windows Forms搭配使用。 將程式碼貼到表單中，並在處理表單的事件 Paint 時呼叫 FillRegionExcludingPath 方法，並傳遞 e 為 PaintEventArgs 。

private:
   void FillRegionExcludingPath( PaintEventArgs^ e )
   {
      // Create the region using a rectangle.
      System::Drawing::Region^ myRegion = gcnew System::Drawing::Region( Rectangle(20,20,100,100) );

      // Create the GraphicsPath.
      System::Drawing::Drawing2D::GraphicsPath^ path = gcnew System::Drawing::Drawing2D::GraphicsPath;

      // Add a circle to the graphics path.
      path->AddEllipse( 50, 50, 25, 25 );

      // Exclude the circle from the region.
      myRegion->Exclude( path );

      // Retrieve a Graphics object from the form.
      Graphics^ formGraphics = e->Graphics;

      // Fill the region in blue.
      formGraphics->FillRegion( Brushes::Blue, myRegion );

      // Dispose of the path and region objects.
      delete path;
      delete myRegion;
   }

private void FillRegionExcludingPath(PaintEventArgs e)
{

    // Create the region using a rectangle.
    Region myRegion = new Region(new Rectangle(20, 20, 100, 100));

    // Create the GraphicsPath.
    System.Drawing.Drawing2D.GraphicsPath path = 
        new System.Drawing.Drawing2D.GraphicsPath();

    // Add a circle to the graphics path.
    path.AddEllipse(50, 50, 25, 25);

    // Exclude the circle from the region.
    myRegion.Exclude(path);

    // Retrieve a Graphics object from the form.
    Graphics formGraphics = e.Graphics;

    // Fill the region in blue.
    formGraphics.FillRegion(Brushes.Blue, myRegion);

    // Dispose of the path and region objects.
    path.Dispose();
    myRegion.Dispose();
}

Private Sub FillRegionExcludingPath(ByVal e As PaintEventArgs)

    ' Create the region using a rectangle.
    Dim myRegion As New Region(New Rectangle(20, 20, 100, 100))

    ' Create the GraphicsPath.
    Dim path As New System.Drawing.Drawing2D.GraphicsPath

    ' Add a circle to the graphics path.
    path.AddEllipse(50, 50, 25, 25)

    ' Exclude the circle from the region.
    myRegion.Exclude(path)

    ' Retrieve a Graphics object from the form.
    Dim formGraphics As Graphics = e.Graphics

    ' Fill the region in blue.
    formGraphics.FillRegion(Brushes.Blue, myRegion)

    ' Dispose of the path and region objects.
    path.Dispose()
    myRegion.Dispose()

End Sub

備註

呼叫 Dispose 可讓這個 Region 所使用的資源重新配置以供其他用途使用。

Dispose 使用完畢時，請呼叫 Region。 Dispose 方法會將 Region 保留在無法使用的狀態。 呼叫 Dispose 之後，您必須釋放 的所有參考， Region 讓垃圾收集行程可以回收佔用的 Region 記憶體。 如需詳細資訊，請參閱 清除 Unmanaged 資源 及 實作 Dispose 方法。

注意

在您釋放最後一個 Dispose 參考之前，請務必呼叫 Region。 否則工作窗格所使用的資源不會釋放，直到記憶體回收行程呼叫 Region 物件的 Finalize 方法。