C# ComponentEditorPage类代码示例

// This example component editor page type provides an example 
   // ComponentEditorPage implementation.
   internal class ExampleComponentEditorPage : System.Windows.Forms.Design.ComponentEditorPage
   {
       Label l1; 
       Button b1; 
       PropertyGrid pg1;

       // Base64-encoded serialized image data for the required component editor page icon.
       string icon = "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";

       public ExampleComponentEditorPage()
       {
           // Initialize the page, which inherits from Panel, and its controls.
           this.Size = new Size( 400, 250 );            
           this.Icon = DeserializeIconFromBase64Text(icon);
           this.Text = "Example Page";
           
           b1 = new Button();
           b1.Size = new Size(200, 20);
           b1.Location = new Point(200, 0);
           b1.Text = "Set a random background color";
           b1.Click += new EventHandler(this.randomBackColor);
           this.Controls.Add( b1 );

           l1 = new Label();
           l1.Size = new Size(190, 20);
           l1.Location = new Point(4, 2);
           l1.Text = "Example Component Editor Page";
           this.Controls.Add( l1 );

           pg1 = new PropertyGrid();
           pg1.Size = new Size(400, 280);
           pg1.Location = new Point(0,30);
           this.Controls.Add( pg1 );
       }
       
       // This method indicates that the Help button should be enabled for this 
       // component editor page.
       public override bool SupportsHelp()
       { 
           return true; 
       }

       // This method is called when the Help button for this component editor page is pressed.
       // This implementation uses the IHelpService to show the Help topic for a sample keyword.
       public override void ShowHelp()
       {
           // The GetSelectedComponent method of a ComponentEditorPage retrieves the
           // IComponent associated with the WindowsFormsComponentEditor.
           IComponent selectedComponent = this.GetSelectedComponent();

           // Retrieve the Site of the component, and return if null.
           ISite componentSite = selectedComponent.Site;
           if(componentSite == null)
               return;

           // Acquire the IHelpService to display a help topic using a indexed keyword lookup.
           IHelpService helpService = (IHelpService)componentSite.GetService(typeof(IHelpService));
           if (helpService != null)
               helpService.ShowHelpFromKeyword("System.Windows.Forms.ComboBox");
       }

       // The LoadComponent method is raised when the ComponentEditorPage is displayed.
       protected override void LoadComponent()
       { 
           this.pg1.SelectedObject = this.Component; 
       }
   
       // The SaveComponent method is raised when the WindowsFormsComponentEditor is closing 
       // or the current ComponentEditorPage is closing.
       protected override void SaveComponent()
       {
       }

       // If the associated component is a Control, this method sets the BackColor to a random color.
       // This method is invoked by the button on this ComponentEditorPage.
       private void randomBackColor(object sender, EventArgs e)
       {
           if( typeof(System.Windows.Forms.Control).IsAssignableFrom( this.Component.GetType() ) )
           {
               // Sets the background color of the Control associated with the
               // WindowsFormsComponentEditor to a random color.
               Random rnd = new Random();
               ((System.Windows.Forms.Control)this.Component).BackColor = 
                   Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255));
               pg1.Refresh();
           }
       }

       // This method can be used to retrieve an Icon from a block 
       // of Base64-encoded text.
       private Icon DeserializeIconFromBase64Text(string text)
       {
           Icon img = null;
           byte[] memBytes = Convert.FromBase64String(text);
           IFormatter formatter = new BinaryFormatter();
           MemoryStream stream = new MemoryStream(memBytes);
           img = (Icon)formatter.Deserialize(stream);
           stream.Close();
           return img;
       }
   }