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

定义

获取或设置一个值,该值指示是否显示该控件及其所有子控件。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

属性值

如果显示该控件及其所有子控件,则为 true;否则为 falsetrue if the control and all its child controls are displayed; otherwise, false. 默认值为 trueThe default is true.

示例

下面的代码示例使用派生的类VScrollBarHScrollBar,并设置其Visible属性值,根据大小Image显示在PictureBox控件。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. 此示例需要PictureBox是否已创建一个窗体,在HScrollBarVScrollBar上已创建控件PictureBoxThis example requires that a PictureBox has been created on a form and that HScrollBar and VScrollBar controls have been created on the PictureBox. 此代码时,应调用该映像加载到图片框和Resize窗体的事件。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 'DisplayScrollBars

注解

请注意,即使Visible设置为true,控件可能不会显示给用户如果它是其他控件遮盖。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.

适用于

另请参阅