Control.Visible Control.Visible Control.Visible Control.Visible Property

定義

取得或設定值,這個值指出是否顯示控制項及其所有子控制項。Gets or sets a value indicating whether the control and all its child controls are displayed.

public:
 property bool Visible { bool get(); void set(bool value); };
public bool Visible { get; set; }
member this.Visible : bool with get, set
Public Property Visible As Boolean

屬性值

如果控制項及其所有子控制項都會顯示,則為 true,否則為 falsetrue if the control and all its child controls are displayed; otherwise, false. 預設為 trueThe default is true.

範例

下列程式碼範例會VScrollBar根據Image要顯示在HScrollBar PictureBox控制項中的Visible大小,使用衍生的類別和,並設定其屬性值。The following code example uses the derived classes VScrollBar and HScrollBar and sets their Visible property values, based on the size of an Image being displayed in a PictureBox control. 這個範例需要PictureBox在表單上建立, HScrollBar而且已在上PictureBox建立VScrollBar和控制項。This example requires that a PictureBox has been created on a form and that HScrollBar and VScrollBar controls have been created on the PictureBox. 此程式碼應該在影像載入圖片方塊中,以及由Resize表單的事件時呼叫。This code should be called when the image is loaded into the picture box and by the Resize event of the form.

public:
   void DisplayScrollBars()
   {
      // Display or hide the scroll bars based upon  
      // whether the image is larger than the PictureBox.
      if ( pictureBox1->Width > pictureBox1->Image->Width )
      {
         hScrollBar1->Visible = false;
      }
      else
      {
         hScrollBar1->Visible = true;
      }

      if ( pictureBox1->Height > pictureBox1->Image->Height )
      {
         vScrollBar1->Visible = false;
      }
      else
      {
         vScrollBar1->Visible = true;
      }
   }
public void DisplayScrollBars()
 {
    // Display or hide the scroll bars based upon  
    // whether the image is larger than the PictureBox.
    if (pictureBox1.Width > pictureBox1.Image.Width)
    {
       hScrollBar1.Visible = false;
    }
    else
    {
       hScrollBar1.Visible = true;
    }
    
    if (pictureBox1.Height > pictureBox1.Image.Height)
    {
       vScrollBar1.Visible = false;
    }
    else
    {
       vScrollBar1.Visible = true;
    }
 }
 
Public Sub DisplayScrollBars()
    ' Display or hide the scroll bars based upon  
    ' whether the image is larger than the PictureBox.
    If pictureBox1.Width > pictureBox1.Image.Width Then
        hScrollBar1.Visible = False
    Else
        hScrollBar1.Visible = True
    End If
    
    If pictureBox1.Height > pictureBox1.Image.Height Then
        vScrollBar1.Visible = False
    Else
        vScrollBar1.Visible = True
    End If
End Sub

備註

請注意,即使Visible設為true,如果使用者隱藏在其他控制項後方,可能就看不到該控制項。Note that even if Visible is set to true, the control might not be visible to the user if it is obscured behind other controls.

適用於

另請參閱