Binding.Parse Event
Assembly: System.Windows.Forms (in system.windows.forms.dll)
'Declaration Public Event Parse As ConvertEventHandler 'Usage Dim instance As Binding Dim handler As ConvertEventHandler AddHandler instance.Parse, handler
/** @event */ public void add_Parse (ConvertEventHandler value) /** @event */ public void remove_Parse (ConvertEventHandler value)
JScript supports the use of events, but not the declaration of new ones.
The Format and Parse events allow you to create custom formats for displaying data. For example, if the data in a table is of type Decimal, you can display the data in the local currency format by setting the Value property of the ConvertEventArgs to the formatted value in the Format event. You must consequently unformat the displayed value in the Parse event.
The Parse event occurs under the following conditions:
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When the EndCurrentEdit method of the BindingManagerBase is called.
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When the Current of the BindingManagerBase changes (in other words, when the Position changes).
For more information about handling events, see Consuming Events.
The following code example creates a Binding, adds a ConvertEventHandler delegate to both the Parse and Format events, and adds the Binding to the BindingsCollection of a TextBox control through the DataBindings property. The DecimalToCurrencyString event delegate, added to the Format event, formats the bound value (a Decimal type) as currency using the ToString method. The CurrencyStringToDecimal event delegate, added to the Parse event, converts the value displayed by the control back to the Decimal type.
Private Sub DecimalToCurrencyString(sender As Object, cevent As ConvertEventArgs) ' The method converts only to string type. Test this using the DesiredType. If Not cevent.DesiredType Is GetType(String) Then Exit Sub End If ' Use the ToString method to format the value as currency ("c"). cevent.Value = CType(cevent.Value, decimal).ToString("c") End Sub Private Sub CurrencyStringToDecimal(sender As Object, cevent As ConvertEventArgs) ' The method converts back to decimal type only. If Not cevent.DesiredType Is GetType(Decimal) Then Exit Sub End If ' Convert the string back to decimal using the shared Parse method. cevent.Value = Decimal.Parse(cevent.Value.ToString, _ NumberStyles.Currency, nothing) End Sub Private Sub BindControl ' Create the binding first. The OrderAmount is typed as Decimal. Dim b As Binding = New Binding _ ("Text", ds, "Customers.custToOrders.OrderAmount") ' Add the delegates to the event. AddHandler b.Format, AddressOf DecimalToCurrencyString AddHandler b.Parse, AddressOf CurrencyStringToDecimal text1.DataBindings.Add(b) End Sub
private void DecimalToCurrencyString(Object sender, ConvertEventArgs cevent)
{
// The method converts only to string type. Test this using
// the DesiredType.
if (!cevent.get_DesiredType().Equals(String.class.ToType())) {
return;
}
// Use the ToString method to format the value as currency ("c").
cevent.set_Value(((System.Decimal)(cevent.get_Value())).ToString("c"));
} //DecimalToCurrencyString
private void CurrencyStringToDecimal(Object sender, ConvertEventArgs cevent)
{
// The method converts back to decimal type only.
if (!cevent.get_DesiredType().Equals(System.Decimal.class.ToType())) {
return;
}
// Converts the string back to decimal using the static Parse method.
cevent.set_Value(Decimal.Parse(cevent.get_Value().ToString(),
NumberStyles.Currency, null));
} //CurrencyStringToDecimal
private void BindControl()
{
// Creates the binding first. The OrderAmount is typed as Decimal.
Binding b = new Binding("Text", ds,
"customers.custToOrders.OrderAmount");
// Add the delegates to the event.
b.add_Format(new ConvertEventHandler(DecimalToCurrencyString));
b.add_Parse(new ConvertEventHandler(CurrencyStringToDecimal));
text1.get_DataBindings().Add(b);
} //BindControl
private function DecimalToCurrencyString(sender, cevent : ConvertEventArgs) { // The method converts only to string type. Test this using the DesiredType. if(cevent.DesiredType != String.GetType()) return; cevent.Value = (Decimal(cevent.Value)).ToString("c"); } private function CurrencyStringToDecimal(sender, cevent : ConvertEventArgs) { // The method converts back to decimal type only. if(cevent.DesiredType != Decimal.GetType()) return; // Converts the string back to decimal using the static Parse method. cevent.Value = Decimal.Parse(cevent.Value.ToString(), NumberStyles.Currency, null); } private function BindControl() { // Creates the binding first. The OrderAmount is a Decimal type. var b : Binding = new Binding ("Text", ds, "Suppliers.CompanyName"); // Add the delegates to the event. b.add_Format(DecimalToCurrencyString); b.add_Parse(CurrencyStringToDecimal); text1.DataBindings.Add(b); }
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.