Export (0) Print
Expand All

FormClosingEventArgs Class

Provides data for the FormClosing event.

System.Object
  System.EventArgs
    System.ComponentModel.CancelEventArgs
      System.Windows.Forms.FormClosingEventArgs

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public class FormClosingEventArgs : CancelEventArgs

The FormClosingEventArgs type exposes the following members.

  NameDescription
Public methodFormClosingEventArgsInitializes a new instance of the FormClosingEventArgs class.
Top

  NameDescription
Public propertyCancelGets or sets a value indicating whether the event should be canceled. (Inherited from CancelEventArgs.)
Public propertyCloseReasonGets a value that indicates why the form is being closed.
Top

  NameDescription
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Top

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.

If a form has any child or owned forms, a FormClosing event is also raised for each one. If any one of the forms cancels the event, none of the forms are closed. Therefore the corresponding FormClosed events are not sent to any of the forms.

The FormClosingEventArgs class provides data for this event. Two important members are the Cancel and CloseReason properties. The event can be canceled by setting the Cancel property to true. The CloseReason property provides a reason why the form is being closed.

The following code example demonstrates the use of this type. In the example, an event handler reports on the occurrence of the FormClosing event. This report helps you to learn when the event occurs and can assist you in debugging. 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.

To run the example code, paste it into a project that contains an instance of type Form named Form1. 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" );
}

.NET Framework

Supported in: 4.5.3, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Show:
© 2014 Microsoft