TabControlCancelEventArgs TabControlCancelEventArgs TabControlCancelEventArgs TabControlCancelEventArgs Class


Selecting 控件的 DeselectingTabControl 事件提供数据。Provides data for the Selecting and Deselecting events of a TabControl control.

public ref class TabControlCancelEventArgs : System::ComponentModel::CancelEventArgs
public class TabControlCancelEventArgs : System.ComponentModel.CancelEventArgs
type TabControlCancelEventArgs = class
    inherit CancelEventArgs
Public Class TabControlCancelEventArgs
Inherits CancelEventArgs


下面的代码示例演示如何使用此类型。The following code example demonstrates the use of this type. 在此示例中, 事件处理程序报告Selecting事件的发生。In the example, an event handler reports on the occurrence of the Selecting event. 此报表可帮助你了解何时发生事件, 并可帮助你进行调试。This report helps you to learn when the event occurs and can assist you in debugging. 若要报告多个事件或频繁发生的事件, 请考虑ShowConsole.WriteLine消息替换为多行或将TextBox其追加到多行。To report on multiple events or on events that occur frequently, consider replacing Show with Console.WriteLine or appending the message to a multiline TextBox.

若要运行示例代码, 请将其粘贴到包含名为TabControl TabControl1的类型的实例的项目中。To run the example code, paste it into a project that contains an instance of type TabControl named TabControl1. 然后, 确保事件处理程序与Selecting事件相关联。Then ensure that the event handler is associated with the Selecting event.

private void TabControl1_Selecting(Object sender, TabControlCancelEventArgs e) {

System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
messageBoxCS.AppendFormat("{0} = {1}", "TabPage", e.TabPage );
messageBoxCS.AppendFormat("{0} = {1}", "TabPageIndex", e.TabPageIndex );
messageBoxCS.AppendFormat("{0} = {1}", "Action", e.Action );
messageBoxCS.AppendFormat("{0} = {1}", "Cancel", e.Cancel );
MessageBox.Show(messageBoxCS.ToString(), "Selecting Event" );
Private Sub TabControl1_Selecting(sender as Object, e as TabControlCancelEventArgs) _ 
     Handles TabControl1.Selecting

    Dim messageBoxVB as New System.Text.StringBuilder()
    messageBoxVB.AppendFormat("{0} = {1}", "TabPage", e.TabPage)
    messageBoxVB.AppendFormat("{0} = {1}", "TabPageIndex", e.TabPageIndex)
    messageBoxVB.AppendFormat("{0} = {1}", "Action", e.Action)
    messageBoxVB.AppendFormat("{0} = {1}", "Cancel", e.Cancel)
    MessageBox.Show(messageBoxVB.ToString(),"Selecting Event")

End Sub


Action使用属性可确定发生的事件。Use the Action property to determine which event is occurring. 这使您可以通过一个事件处理程序来处理多个事件类型。This enables you to handle multiple event types with one event handler.

TabPage使用和TabPageIndex属性来确定TabPage发生事件的事件。Use the TabPage and TabPageIndex properties to determine which TabPage the event is occurring for.

若要在中TabControl取消选项卡更改, 请Cancel将属性设置为。 trueTo cancel a tab change in a TabControl, set the Cancel property to true.

有关处理事件的详细信息, 请参阅处理和引发事件For more information about handling events, see Handling and Raising Events.


TabControlCancelEventArgs(TabPage, Int32, Boolean, TabControlAction) TabControlCancelEventArgs(TabPage, Int32, Boolean, TabControlAction) TabControlCancelEventArgs(TabPage, Int32, Boolean, TabControlAction) TabControlCancelEventArgs(TabPage, Int32, Boolean, TabControlAction)

初始化 TabControlCancelEventArgs 类的新实例。Initializes a new instance of the TabControlCancelEventArgs class.


Action Action Action Action

获取一个值,该值指示当前发生的事件。Gets a value indicating which event is occurring.

Cancel Cancel Cancel Cancel

获取或设置指示是否应取消事件的值。Gets or sets a value indicating whether the event should be canceled.

(Inherited from CancelEventArgs)
TabPage TabPage TabPage TabPage

获取发生的事件所针对的 TabPageGets the TabPage the event is occurring for.

TabPageIndex TabPageIndex TabPageIndex TabPageIndex

获取 TabPage 集合中 TabPages 的从零开始的索引。Gets the zero-based index of the TabPage in the TabPages collection.


Equals(Object) Equals(Object) Equals(Object) Equals(Object)

确定指定的对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

作为默认哈希函数。Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

获取当前实例的 TypeGets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(Inherited from Object)
ToString() ToString() ToString() ToString()

返回表示当前对象的字符串。Returns a string that represents the current object.

(Inherited from Object)