FormClosingEventArgs FormClosingEventArgs FormClosingEventArgs FormClosingEventArgs Class

定义

FormClosing 事件提供数据。Provides data for the FormClosing event.

public ref class FormClosingEventArgs : System::ComponentModel::CancelEventArgs
public class FormClosingEventArgs : System.ComponentModel.CancelEventArgs
type FormClosingEventArgs = class
    inherit CancelEventArgs
Public Class FormClosingEventArgs
Inherits CancelEventArgs
继承
FormClosingEventArgsFormClosingEventArgsFormClosingEventArgsFormClosingEventArgs

示例

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FormClosing事件的发生。In the example, an event handler reports on the occurrence of the FormClosing 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Form Form1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 Form named Form1. 然后, 确保事件处理程序与FormClosing事件相关联。Then ensure that the event handler is associated with the FormClosing event.

private void Form1_FormClosing(Object sender, FormClosingEventArgs e) {

System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
messageBoxCS.AppendFormat("{0} = {1}", "CloseReason", e.CloseReason );
messageBoxCS.AppendLine();
messageBoxCS.AppendFormat("{0} = {1}", "Cancel", e.Cancel );
messageBoxCS.AppendLine();
MessageBox.Show(messageBoxCS.ToString(), "FormClosing Event" );
}
Private Sub Form1_FormClosing(sender as Object, e as FormClosingEventArgs) _ 
     Handles Form1.FormClosing

    Dim messageBoxVB as New System.Text.StringBuilder()
    messageBoxVB.AppendFormat("{0} = {1}", "CloseReason", e.CloseReason)
    messageBoxVB.AppendLine()
    messageBoxVB.AppendFormat("{0} = {1}", "Cancel", e.Cancel)
    messageBoxVB.AppendLine()
    MessageBox.Show(messageBoxVB.ToString(),"FormClosing Event")

End Sub

注解

FormClosing事件恰好在窗体关闭之前发生, 无论是由用户通过用户界面 (UI) 或通过调用方法Close (如Form类中的或Exit Application在类中) 来进行的。The FormClosing event occurs just before a form is closed, either by the user, through the user interface (UI), or programmatically, through calls to methods such as Close in the Form class, or Exit in the Application class.

如果窗体具有任何子窗体或拥有的FormClosing窗体, 则还会引发每个窗体的事件。If a form has any child or owned forms, a FormClosing event is also raised for each one. 如果任何一个窗体取消了该事件, 则不会关闭任何窗体。If any one of the forms cancels the event, none of the forms are closed. 因此, 相应FormClosed的事件不会发送到任何窗体。Therefore the corresponding FormClosed events are not sent to any of the forms.

FormClosingEventArgs类为此事件提供数据。The FormClosingEventArgs class provides data for this event. 两个重要成员是CancelCloseReason属性。Two important members are the Cancel and CloseReason properties. 可以通过将Cancel属性设置为 true 来取消事件。The event can be canceled by setting the Cancel property to true. CloseReason属性提供关闭窗体的原因。The CloseReason property provides a reason why the form is being closed.

构造函数

FormClosingEventArgs(CloseReason, Boolean) FormClosingEventArgs(CloseReason, Boolean) FormClosingEventArgs(CloseReason, Boolean) FormClosingEventArgs(CloseReason, Boolean)

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

属性

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)
CloseReason CloseReason CloseReason CloseReason

获取一个值,该值指示关闭窗体的原因。Gets a value that indicates why the form is being closed.

方法

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)

适用于

另请参阅