使用指定之文化特性专属格式资讯，将指定之物件的值转换为双精确度浮点数。
Converts the value of the specified object to an double-precision floating-point number, using the specified culture-specific formatting information.
使用指定之文化特性专属格式资讯，将指定之物件的值转换为单精确度浮点数。
Converts the value of the specified object to an single-precision floating-point number, using the specified culture-specific formatting information.
将数字的字串表示(使用指定样式和的特定文化特性格式)转换为其对等的单精确度浮点数。
Converts the string representation of a number in a specified style and culture-specific format to its single-precision floating-point number equivalent.
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