Επεξεργασία

Κοινή χρήση μέσω

InvalidateEventArgs Class

  • Reference

Definition

Namespace:
System.Windows.Forms
Assembly:
System.Windows.Forms.dll
Source:
InvalidateEventArgs.cs
Source:
InvalidateEventArgs.cs
Source:
InvalidateEventArgs.cs

Provides data for the Invalidated event.

public ref class InvalidateEventArgs : EventArgs
public class InvalidateEventArgs : EventArgs
type InvalidateEventArgs = class
    inherit EventArgs
Public Class InvalidateEventArgs
Inherits EventArgs
Inheritance
Object
EventArgs
InvalidateEventArgs

Examples

The following code example demonstrates the use of this type. In the example, an event handler reports on the occurrence of the Invalidated 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 a type that inherits from Control, such as a Button or ComboBox. Then name the instance Control1 and ensure that the event handler is associated with the Invalidated event.

private void Control1_Invalidated(Object sender, InvalidateEventArgs e) {

System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder();
messageBoxCS.AppendFormat("{0} = {1}", "InvalidRect", e.InvalidRect );
messageBoxCS.AppendLine();
MessageBox.Show(messageBoxCS.ToString(), "Invalidated Event" );
}

Private Sub Control1_Invalidated(sender as Object, e as InvalidateEventArgs) _ 
     Handles Control1.Invalidated

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

End Sub

Remarks

The Invalidated event occurs when a control's display is updated. An InvalidateEventArgs specifies the rectangle that contains the invalidated window area.

For information about the event model, see Handling and Raising Events.

Constructors

InvalidateEventArgs(Rectangle)

Initializes a new instance of the InvalidateEventArgs class.

Properties

InvalidRect

Gets the Rectangle that contains the invalidated window area.

Methods

Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetType()

Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
ToString()

Returns a string that represents the current object.

(Inherited from Object)

Applies to

See also