十进制.解析字符串，后缀减号 [英] Decimal. Parse string, postfixed by a minus sign

问题描述

decimal decimalVal;
Decimal.TryParse("123-", out decimalVal);
Console.WriteLine(decimalVal); // -123

为什么用这种方式解析"123-"字符串?

Why do "123-" string parsed this way?

推荐答案

十进制.TryParse方法使用 NumberStyles.Number 默认情况下. NumberStyles.Number 包括

The Decimal.TryParse Method parses the input with NumberStyles.Number by default. NumberStyles.Number includes NumberStyles.AllowTrailingSign.

Decimal.TryParse方法(字符串，十进制)

[...]
参数s使用NumberStyles.Number样式进行解释.
[...]

[...]
Parameter s is interpreted using the NumberStyles.Number style.
[...]

数字指示使用了AllowLeadingWhite，AllowTrailingWhite，AllowLeadingSign，AllowTrailingSign，AllowDecimalPoint和AllowThousands样式.这是一种复合数字样式.

Number   Indicates that the AllowLeadingWhite, AllowTrailingWhite, AllowLeadingSign, AllowTrailingSign, AllowDecimalPoint, and AllowThousands styles are used. This is a composite number style.

AllowTrailingSign 表示数字字符串可以带有结尾符号.有效的尾随符号由NumberFormatInfo.PositiveSign和NumberFormatInfo.NegativeSign属性确定.

AllowTrailingSign   Indicates that the numeric string can have a trailing sign. Valid trailing sign characters are determined by the NumberFormatInfo.PositiveSign and NumberFormatInfo.NegativeSign properties.

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