WindowsFormsComponentEditor 類別

定義

命名空間:
System.Windows.Forms.Design
組件:
System.Windows.Forms.dll

提供一個基底類別，供使用模態對話框顯示類似 ActiveX 控制項屬性頁的編輯者使用。

public ref class WindowsFormsComponentEditor abstract : System::ComponentModel::ComponentEditor
public abstract class WindowsFormsComponentEditor : System.ComponentModel.ComponentEditor
type WindowsFormsComponentEditor = class
    inherit ComponentEditor
Public MustInherit Class WindowsFormsComponentEditor
Inherits ComponentEditor
繼承
Object
ComponentEditor
WindowsFormsComponentEditor
衍生

範例

以下程式碼範例展示了一個實 WindowsFormsComponentEditor 作範例。

using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Windows.Forms;
using System.Windows.Forms.Design;

// This example demonstrates how to implement a component editor that hosts
// component pages and associate it with a component. This example also
// demonstrates how to implement a component page that provides a panel-based
// control system and Help keyword support.

// The ExampleComponentEditor displays two ExampleComponentEditorPage pages.
public class ExampleComponentEditor : WindowsFormsComponentEditor
{
    // This method override returns an type array containing the type of
    // each component editor page to display.
    protected override Type[] GetComponentEditorPages() => [typeof(ExampleComponentEditorPage), typeof(ExampleComponentEditorPage)];

    // This method override returns the index of the page to display when the
    // component editor is first displayed.
    protected override int GetInitialComponentEditorPageIndex() => 1;
}

// This example component editor page type provides an example
// ComponentEditorPage implementation.
class ExampleComponentEditorPage : ComponentEditorPage
{
    readonly Label _l1;
    readonly Button b1;
    readonly PropertyGrid pg1;

    public ExampleComponentEditorPage()
    {
        // Initialize the page, which inherits from Panel, and its controls.
        Size = new Size(400, 250);
        Icon = new Icon("myicon.ico");
        Text = "Example Page";

        b1 = new Button
        {
            Size = new Size(200, 20),
            Location = new Point(200, 0),
            Text = "Set a random background color"
        };
        b1.Click += randomBackColor;
        Controls.Add(b1);

        _l1 = new Label
        {
            Size = new Size(190, 20),
            Location = new Point(4, 2),
            Text = "Example Component Editor Page"
        };
        Controls.Add(_l1);

        pg1 = new PropertyGrid
        {
            Size = new Size(400, 280),
            Location = new Point(0, 30)
        };
        Controls.Add(pg1);
    }

    // This method indicates that the Help button should be enabled for this
    // component editor page.
    public override bool SupportsHelp() => 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 = 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));
        helpService?.ShowHelpFromKeyword("System.Windows.Forms.ComboBox");
    }

    // The LoadComponent method is raised when the ComponentEditorPage is displayed.
    protected override void LoadComponent() => pg1.SelectedObject = 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.
    void randomBackColor(object sender, EventArgs e)
    {
        if (typeof(Control).IsAssignableFrom(Component.GetType()))
        {
            // Sets the background color of the Control associated with the
            // WindowsFormsComponentEditor to a random color.
            Random rnd = new();
            ((Control)Component).BackColor =
                Color.FromArgb(rnd.Next(255), rnd.Next(255), rnd.Next(255));
            pg1.Refresh();
        }
    }
}

// This example control is associated with the ExampleComponentEditor
// through the following EditorAttribute.
[Editor(typeof(ExampleComponentEditor), typeof(ComponentEditor))]
public class ExampleUserControl : UserControl;

建構函式

名稱 Description
WindowsFormsComponentEditor()

初始化 WindowsFormsComponentEditor 類別的新執行個體。

方法

名稱 Description
EditComponent(ITypeDescriptorContext, Object, IWin32Window)

建立一個編輯器視窗，讓使用者可以編輯指定的元件。
EditComponent(ITypeDescriptorContext, Object)

建立一個編輯器視窗，讓使用者能使用指定的上下文資訊編輯指定的元件。
EditComponent(Object, IWin32Window)

建立一個編輯器視窗，讓使用者使用擁有該元件的指定視窗來編輯指定的元件。
EditComponent(Object)

編輯該元件並回傳一個值，表示該元件是否被修改。

(繼承來源 ComponentEditor)
Equals(Object)

判斷指定的 物件是否等於目前的物件。

(繼承來源 Object)
GetComponentEditorPages()

取得與該編輯器相關的元件編輯器頁面。
GetHashCode()

做為預設雜湊函式。

(繼承來源 Object)
GetInitialComponentEditorPageIndex()

取得元件編輯器初始頁面的索引，供元件編輯器顯示。
GetType()

取得目前實例的 Type。

(繼承來源 Object)
MemberwiseClone()

建立目前 Object的淺層複本。

(繼承來源 Object)
ToString()

傳回表示目前 物件的字串。

(繼承來源 Object)

適用於

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