ComponentChangingEventArgs 类

定义

public ref class ComponentChangingEventArgs sealed : EventArgs

public sealed class ComponentChangingEventArgs : EventArgs

[System.Runtime.InteropServices.ComVisible(true)]
public sealed class ComponentChangingEventArgs : EventArgs

type ComponentChangingEventArgs = class
    inherit EventArgs

[<System.Runtime.InteropServices.ComVisible(true)>]
type ComponentChangingEventArgs = class
    inherit EventArgs

Public NotInheritable Class ComponentChangingEventArgs
Inherits EventArgs

继承

Object

EventArgs

ComponentChangingEventArgs

属性

ComVisibleAttribute

示例

以下示例演示如何创建 ComponentChangingEventArgs。

public:
   // This example method creates a ComponentChangingEventArgs using the specified arguments.
   // Typically, this type of event args is created by a design mode subsystem.
   ComponentChangingEventArgs^ CreateComponentChangingEventArgs( Object^ component, MemberDescriptor^ member )
   {
      // The component that is about to change:       args.Component
      // The member that is about to change:          args.Member
      return gcnew ComponentChangingEventArgs( component,member );
   }

// This example method creates a ComponentChangingEventArgs using the specified arguments.
// Typically, this type of event args is created by a design mode subsystem.  
public ComponentChangingEventArgs CreateComponentChangingEventArgs(object component, MemberDescriptor member)
{
    ComponentChangingEventArgs args = new ComponentChangingEventArgs(component, member);

    // The component that is about to change:       args.Component
    // The member that is about to change:          args.Member

    return args;
}

' This example method creates a ComponentChangingEventArgs using the specified arguments.
' Typically, this type of event args is created by a design mode subsystem.  
Public Function CreateComponentChangingEventArgs(ByVal component As Object, ByVal member As MemberDescriptor) As ComponentChangingEventArgs
    Dim args As New ComponentChangingEventArgs(component, member)

    ' The component that is about to change:       args.Component
    ' The member that is about to change:          args.Member

    Return args
End Function

注解

ComponentChangingEventArgs 提供有关事件 ComponentChanging 的数据。 事件 ComponentChanging 通知 IComponentChangeService 和注册的事件处理程序当前设计文档中的特定组件即将更改。 此事件提供了一种广泛可访问的方法，用于防止组件更改。

更改 ComponentChanging 组件之前会引发 事件。 此事件为设计者提供了中止更改的机会。 组件设计器通常自动引发 ComponentChanging 事件。 如果无法更改属性，则处理事件的方法可能会引发异常。 例如，如果将设计器文件签入源代码控制，则当用户拒绝检查文件时，此事件的处理程序通常会引发异常。

提供 ComponentChangingEventArgs 以下信息：

• 一个 Component 属性，指示即将修改的组件。

• 指示 Member 即将更改的成员的属性。

继承者说明

如果将此类指定为另一个类的基类，则会发生编译器错误。

构造函数

属性

方法

适用于

另请参阅

• ComponentChanging
• ComponentChanged
• ComponentChangingEventHandler
• IComponentChangeService