Decimal.IConvertible.ToDouble(IFormatProvider) 方法

定義

如需這個成員的說明,請參閱 ToDouble(IFormatProvider)For a description of this member, see ToDouble(IFormatProvider).

 virtual double System.IConvertible.ToDouble(IFormatProvider ^ provider) = IConvertible::ToDouble;
double IConvertible.ToDouble (IFormatProvider provider);
Function ToDouble (provider As IFormatProvider) As Double Implements IConvertible.ToDouble

參數

provider
IFormatProvider

這個參數已忽略。This parameter is ignored.

傳回

目前執行個體的值,轉換為 DoubleThe value of the current instance, converted to a Double.

實作

備註

這個成員是明確介面成員實作,This member is an explicit interface member implementation. 只有在 Decimal 執行個體轉換成 IConvertible 介面時,才能使用這個成員。It can be used only when the Decimal instance is cast to an IConvertible interface. 建議的替代做法是呼叫 Decimal.ToDouble 方法或 Convert.ToDouble 方法。The recommended alternative is to call either the Decimal.ToDouble method or the Convert.ToDouble method.

因為 Double 的有效位數比 Decimal少,所以這種作業可能會產生四捨五入錯誤。Because a Double has fewer significant digits than a Decimal, this operation may produce round-off errors.

適用於