RefreshEventHandler Delegate
Assembly: System (in system.dll)
'Declaration Public Delegate Sub RefreshEventHandler ( _ e As RefreshEventArgs _ ) 'Usage Dim instance As New RefreshEventHandler(AddressOf HandlerMethod)
/** @delegate */ public delegate void RefreshEventHandler ( RefreshEventArgs e )
Not applicable.
Parameters
- e
A RefreshEventArgs that contains the component or Type that changed.
When you create a RefreshEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see Events and Delegates.
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| The HostProtectionAttribute attribute applied to this class has the following Resources property value: SharedState. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes. |
The following sample demonstrates how to use a RefreshEventHandler delegate to handle the Refreshed event when a type or component changes. In the code, the OnRefreshed event handles the event and displays the component being changed.
The code assumes that a TextBox control is already sited on the form.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load TextBox1.Text = "changed" AddHandler System.ComponentModel.TypeDescriptor.Refreshed, AddressOf OnRefreshed System.ComponentModel.TypeDescriptor.GetProperties(TextBox1) System.ComponentModel.TypeDescriptor.Refresh(TextBox1) End Sub Private Sub OnRefreshed(ByVal e As System.ComponentModel.RefreshEventArgs) Console.WriteLine(e.ComponentChanged.ToString()) End Sub
private void Form1_Load(Object sender, System.EventArgs e)
{
textBox1.set_Text("changed");
System.ComponentModel.TypeDescriptor.add_Refreshed(
new System.ComponentModel.RefreshEventHandler(OnRefresh));
System.ComponentModel.TypeDescriptor.GetProperties(textBox1);
System.ComponentModel.TypeDescriptor.Refresh(textBox1);
} //Form1_Load
protected static void OnRefresh(System.ComponentModel.RefreshEventArgs e)
{
Console.WriteLine(e.get_ComponentChanged().ToString());
} //OnRefresh
Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.
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