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ConvertEventArgs.DesiredType 屬性

定義

取得您要的值的資料類型。

public:
 property Type ^ DesiredType { Type ^ get(); };
public Type DesiredType { get; }
public Type? DesiredType { get; }
member this.DesiredType : Type
Public ReadOnly Property DesiredType As Type

屬性值

您要的值的 Type

範例

下列程式碼範例會 DesiredType 使用 屬性來判斷某個類型的轉換是否可以繼續。 方法會 DecimalToCurrencyString 測試 是否 DesiredType 為字串。 如果沒有,程式碼會結束 方法。 同樣地,方法會 CurrencyStringToDecimal 測試 是否 DesiredTypeDecimal ,如果 不是 true ,則會結束。

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

備註

屬性 DesiredType 可讓您檢查要轉換值的屬性類型。

適用於