C# 如何将此科学记数法转换为十进制？
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How to convert this scientific notation to decimal?
提问by ControlPoly
After search in google, using below code still can not be compiled:
在谷歌搜索后，使用以下代码仍然无法编译：
decimal h = Convert.ToDecimal("2.09550901805872E-05");
decimal h2 = Decimal.Parse(
"2.09550901805872E-05",
System.Globalization.NumberStyles.AllowExponent);
采纳答案by ControlPoly
Decimal h2 = 0;
Decimal.TryParse("2.005E01", out h2);
回答by MarcinJuraszek
You have to add NumberStyles.AllowDecimalPointtoo:
您还必须添加NumberStyles.AllowDecimalPoint：
Decimal.Parse("2.09550901805872E-05", NumberStyles.AllowExponent | NumberStyles.AllowDecimalPoint);
MSDNis clear about that:
MSDN对此很清楚：
Indicates that the numeric string can be in exponential notation. The AllowExponent flag allows the parsed string to contain an exponent that begins with the "E" or "e" character and that is followed by an optional positive or negative sign and an integer. In other words, it successfully parses strings in the form nnnExx, nnnE+xx, and nnnE-xx. It does not allow a decimal separator or sign in the significand or mantissa; to allow these elements in the string to be parsed, use the AllowDecimalPoint and AllowLeadingSign flags, or use a composite style that includes these individual flags.
指示数字字符串可以采用指数表示法。AllowExponent 标志允许解析的字符串包含一个以“E”或“e”字符开头的指数，后跟可选的正号或负号和一个整数。换句话说，它成功解析了 nnnExx、nnnE+xx 和 nnnE-xx 形式的字符串。 它不允许在有效数或尾数中使用小数分隔符或符号；要允许解析字符串中的这些元素，请使用 AllowDecimalPoint 和 AllowLeadingSign 标志，或使用包含这些单独标志的复合样式。
回答by Dmitry Bychenko
Since decimal separator("."in your string) can vary from culture to cultureit's safier to use InvariantCulture. Do not forget to allow this decimal
separator (NumberStyles.Float)
由于小数点分隔符（"."在您的字符串中）可能因文化而异，因此使用InvariantCulture. 不要忘记允许这个小数点分隔符 ( NumberStyles.Float)
decimal h = Decimal.Parse(
"2.09550901805872E-05",
NumberStyles.Float | NumberStyles.AllowExponent,
CultureInfo.InvariantCulture);
Perharps, more convenient code is when we use NumberStyles.Any:
Perharps，更方便的代码是当我们使用NumberStyles.Any：
decimal h = Decimal.Parse(
"2.09550901805872E-05",
NumberStyles.Any,
CultureInfo.InvariantCulture);
回答by Damith
use System.Globalization.NumberStyles.Any
用 System.Globalization.NumberStyles.Any
decimal h2 = Decimal.Parse("2.09550901805872E-05", System.Globalization.NumberStyles.Any);
回答by shafi7468
decimal h = Convert.ToDecimal("2.09550901805872E-05");
decimal h2 = decimal.Parse("2.09550901805872E-05", System.Globalization.NumberStyles.Any)
