IButtonControl 接口

定义

命名空间:

System.Windows.Forms

程序集:

System.Windows.Forms.dll

允许控件用作窗体上的按钮。

public interface class IButtonControl

public interface IButtonControl

type IButtonControl = interface

Public Interface IButtonControl

派生

System.Windows.Forms.Button

System.Windows.Forms.LinkLabel

示例

下面的示例继承自 ButtonBase 类并实现 IButtonControl 接口。 将实现添加到 DialogResult 属性和 NotifyDefault 和 PerformClick 方法。

#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>

using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;

public ref class MyButton: public ButtonBase, public IButtonControl
{
private:
   System::Windows::Forms::DialogResult myDialogResult;

public:
   MyButton()
   {
      // Make the button White and a Popup style
      // so it can be distinguished on the form.
      this->FlatStyle = ::FlatStyle::Popup;
      this->BackColor = Color::White;
   }

   property System::Windows::Forms::DialogResult DialogResult 
   {
      // Add implementation to the IButtonControl.DialogResult property.
      virtual System::Windows::Forms::DialogResult get()
      {
         return this->myDialogResult;
      }

      virtual void set( System::Windows::Forms::DialogResult value )
      {
         if ( Enum::IsDefined( System::Windows::Forms::DialogResult::typeid, value ) )
         {
            this->myDialogResult = value;
         }
      }
   }

   // Add implementation to the IButtonControl.NotifyDefault method.
   virtual void NotifyDefault( bool value )
   {
      if ( this->IsDefault != value )
      {
         this->IsDefault = value;
      }
   }

   // Add implementation to the IButtonControl.PerformClick method.
   virtual void PerformClick()
   {
      if ( this->CanSelect )
      {
         this->OnClick( EventArgs::Empty );
      }
   }
};

using System;
using System.Windows.Forms;
using System.Drawing;

public class MyButton : ButtonBase, IButtonControl
{
    private DialogResult myDialogResult;

    public MyButton()
    {
        // Make the button White and a Popup style
        // so it can be distinguished on the form.
        this.FlatStyle = FlatStyle.Popup;
        this.BackColor = Color.White;
    }
        
    // Add implementation to the IButtonControl.DialogResult property.
    public DialogResult DialogResult
    {
        get
        {
            return this.myDialogResult;
        }

        set
        {
            if(Enum.IsDefined(typeof(DialogResult), value))				
            {
                this.myDialogResult = value;
            }
        }	
    }

    // Add implementation to the IButtonControl.NotifyDefault method.
    public void NotifyDefault(bool value)
    {
        if(this.IsDefault != value)
        {
            this.IsDefault = value;
        }
    }

    // Add implementation to the IButtonControl.PerformClick method.
    public void PerformClick()
    {
        if(this.CanSelect)
        {
            this.OnClick(EventArgs.Empty);
        }
    }
}

Imports System.Windows.Forms
Imports System.Drawing


Public Class MyButton
   Inherits ButtonBase
   Implements IButtonControl 
   Private myDialogResult As DialogResult
      
   Public Sub New()
      ' Make the button White and a Popup style      ' so it can be distinguished on the form.
      Me.FlatStyle = FlatStyle.Popup
      Me.BackColor = Color.White
   End Sub
   
   ' Add implementation to the IButtonControl.DialogResult property.
   Public Property DialogResult() As DialogResult Implements IButtonControl.DialogResult
      Get
         Return Me.myDialogResult
      End Get
      
      Set
         If [Enum].IsDefined(GetType(DialogResult), value) Then
            Me.myDialogResult = value
         End If
      End Set
   End Property
   
   ' Add implementation to the IButtonControl.NotifyDefault method.
   Public Sub NotifyDefault(value As Boolean) Implements IButtonControl.NotifyDefault
      If Me.IsDefault <> value Then
         Me.IsDefault = value
      End If
   End Sub 
      
   ' Add implementation to the IButtonControl.PerformClick method.
   Public Sub PerformClick() Implements IButtonControl.PerformClick
      If Me.CanSelect Then
         Me.OnClick(EventArgs.Empty)
      End If
   End Sub

End Class

注解

可以实现此接口的一个示例是默认和取消按钮处理。 为窗体输入未处理的 ENTER 键时，默认按钮会收到通知，就像关闭对话框一样。 同样，每当在窗体上输入未处理的 ESC 键时，都会通知取消按钮，就像取消对话框一样。

实施者说明

在充当按钮控件的类中实现此接口。 此接口的成员将提供基本的按钮功能，例如向父窗体提供 DialogResult 或执行 Click 事件的功能，或充当窗体的默认按钮。

属性

DialogResult

获取或设置单击按钮时返回给父窗体的值。

方法

NotifyDefault(Boolean)	通知某个控件是默认按钮，以便相应调整其外观和行为。
PerformClick()	为该控件生成 Click 事件。

另请参阅

• Button
• Form