X++中的subStr

新手上路:

X++中的subStr: Retrieves part of a string

str subStr(str _text, int _position, int _number)

和平常我们用的SubString 不一样的是，_number 参数允许负数, 当_number < 0 时，表示从_position位置开始倒推几位.

Example:

// Returns the text string CDEFG.
subStr("ABCDEFGHIJ",3,5); 

// Returns the text string DEFG.
subStr("ABCDEFGHIJ",7,-4);

Parameter	Description
_text	The original string.
_position	The position in _text to begin the new string.
_number	The number of characters to select from _position onwards. If there is a minus sign preceding _number, the system selects the substring backward from the specified position.