ConvertEventArgs.DesiredType Property

Reference

Definition

Namespace:: System.Windows.Forms

Assembly:: System.Windows.Forms.dll

Important

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Gets the data type of the desired value.

public:
 property Type ^ DesiredType { Type ^ get(); };

public Type DesiredType { get; }

public Type? DesiredType { get; }

member this.DesiredType : Type

Public ReadOnly Property DesiredType As Type

Property Value

Type

The Type of the desired value.

Examples

The following code example uses the DesiredType property to determine whether the conversion of one type to another can proceed. The DecimalToCurrencyString method tests whether the DesiredType is a string. If not, the code exits the method. Similarly, the CurrencyStringToDecimal method tests whether the DesiredType is a Decimal, and exits if it is not true.

private:
   void DecimalToCurrencyString( Object^ /*sender*/, ConvertEventArgs^ cevent )
   {
      // The method converts only to string type. 
      if ( cevent->DesiredType != String::typeid )
      {
         return;
      }

      cevent->Value = ( (Decimal^)(cevent->Value) )->ToString( "c" );
   }

   void CurrencyStringToDecimal( Object^ /*sender*/, ConvertEventArgs^ cevent )
   {
      // The method converts only to decimal type.
      if ( cevent->DesiredType != Decimal::typeid )
      {
         return;
      }

      cevent->Value = Decimal::Parse( cevent->Value->ToString(),
         NumberStyles::Currency, nullptr );
   }

private void DecimalToCurrencyString(object sender, ConvertEventArgs cevent)
{
   // The method converts only to string type. 
   if(cevent.DesiredType != typeof(string)) return;

   cevent.Value = ((decimal) cevent.Value).ToString("c");
}

private void CurrencyStringToDecimal(object sender, ConvertEventArgs cevent)
{   
   // The method converts only to decimal type.
   if(cevent.DesiredType != typeof(decimal)) return;

   cevent.Value = Decimal.Parse(cevent.Value.ToString(),
   NumberStyles.Currency, null);
}

Private Sub DecimalToCurrencyString(sender As Object, cevent As ConvertEventArgs)
   ' The method converts only to string type. 
   If cevent.DesiredType IsNot GetType(String) Then
      Return
   End If 
   cevent.Value = CDec(cevent.Value).ToString("c")
End Sub 
 
 
Private Sub CurrencyStringToDecimal(sender As Object, cevent As ConvertEventArgs)
   ' The method converts only to decimal type.
   If cevent.DesiredType IsNot GetType(Decimal) Then
      Return
   End If 
 cevent.Value = Decimal.Parse(cevent.Value.ToString, _
 NumberStyles.Currency, nothing)
End Sub

Remarks

The DesiredType property enables you to check the type of the property that the value is being converted to.

Applies to

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