StartIndex不能小于零.参数名称:startIndex [英] StartIndex cannot be less than zero. Parameter name: startIndex

问题描述

我得到了"StartIndex不能小于零.
当我在aspx代码中使用<％= text.Remove(text.LastIndexOf(''，''))％>"时，参数名称:startIndex"，因为我认为这是由于值为空. > 紧急帮助plz
谢谢

i got "StartIndex cannot be less than zero.
Parameter name: startIndex" when i use "<%=text.Remove(text.LastIndexOf('',''))%>" in my aspx code .as i think this is due to empty value.
Urgent help plz
Thanks

推荐答案

int backSlashIndex = text.IndexOf("\\");
域=(backSlashIndex> = 0)? text.Substring(0，backSlashIndex):text;

int backSlashIndex = text.IndexOf("\\");
domain = (backSlashIndex >= 0) ? text.Substring(0, backSlashIndex) : text;

您所得到的错误非常明显-对于基于零的索引方案，您不能传递小于零的错误.

而且我认为由于找不到字符串''，''LastIndexOf给出-1

http://msdn.microsoft.com/en-us/library/9ad138yc.aspx [ ^ ]

尝试检查此-1返回值并进行相应处理.

The error you got is pretty clear - You can not pass less than zero for an ZERO-BASED indexing scenarios.

And I think as no string '','' is found LastIndexOf is giving -1

http://msdn.microsoft.com/en-us/library/9ad138yc.aspx[^]

Try checking this -1 return and handle accordingly.

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