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RefreshEventHandler Delegate

Represents the method that handles the Refreshed event raised when a Type or component is changed during design time.

[Visual Basic]
<Serializable>
Public Delegate Sub RefreshEventHandler( _
   ByVal e As RefreshEventArgs _
)
[C#]
[Serializable]
public delegate void RefreshEventHandler(
   RefreshEventArgs e
);
[C++]
[Serializable]
public __gc __delegate void RefreshEventHandler(
   RefreshEventArgs* e
);

[JScript] In JScript, you can use the delegates in the .NET Framework, but you cannot define your own.

Parameters [Visual Basic, C#, C++]

The declaration of your event handler must have the same parameters as the RefreshEventHandler delegate declaration.

e
A RefreshEventArgs that contains the component or Type that changed.

Remarks

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.

Example

[Visual Basic, C#, C++] 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.

[Visual Basic, C#, C++] The code assumes that a TextBox control is already sited on the form.

[Visual Basic] 
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

[C#] 
private void Form1_Load(object sender, System.EventArgs e)
{
    textBox1.Text = "changed";
    System.ComponentModel.TypeDescriptor.Refreshed += new
    System.ComponentModel.RefreshEventHandler(OnRefresh);
    System.ComponentModel.TypeDescriptor.GetProperties(textBox1);
    System.ComponentModel.TypeDescriptor.Refresh(textBox1);
}

protected static void OnRefresh(System.ComponentModel.RefreshEventArgs e)
{
    Console.WriteLine(e.ComponentChanged.ToString());
}

[C++] 
private:
    void Form1_Load(Object* /*sender*/, System::EventArgs* /*e*/)
    {
        textBox1->Text = S"changed";
        System::ComponentModel::TypeDescriptor::Refreshed += new
            System::ComponentModel::RefreshEventHandler(0, OnRefresh);
        System::ComponentModel::TypeDescriptor::GetProperties(textBox1);
        System::ComponentModel::TypeDescriptor::Refresh(textBox1);
    }

protected:
    static void OnRefresh(System::ComponentModel::RefreshEventArgs* e)
    {
        Console::WriteLine(e->ComponentChanged);
    }

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.ComponentModel

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

Assembly: System (in System.dll)

See Also

System.ComponentModel Namespace | RefreshEventArgs | TypeDescriptor | Refresh

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