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/// <summary>
/// 将字符串转换为Double型
/// </summary>
/// <param name="target">字符串,可接受空值</param>
/// <param name="defaultvalue"></param>
/// <returns>Double型</returns>
public static double? ToDouble(string target, double? defaultvalue)
{
double d;
return (double.TryParse(target, NumberStyles.Float, System.Globalization.CultureInfo.CurrentCulture, out d)) ? d : defaultvalue;
}