字符串为空且不包含任何分隔符时如何处理零索引异常 [英] How handle zero index exception when string is empty and not containing any seprator

问题描述

我正在使用它来删除''，''及其工作正常，并且我使用str作为全局变量，但是如果字符串为空，则会出错，因此当我在aspx页面中计算全局变量时如何处理错误. />

i am using this to remove '','' and its working fine and i am using str as global variable but i get error if string is empty so how to handle error when i cal global variable in aspx page.

string _str = text.Remove(text.LastIndexOf('',''));

推荐答案

可以有多种方法来实现此目的.

你可以这样做

There could be a number of ways to do this.

You could just do this

<br />
if text.length > 0 && text.Contains('','')<br />
string _str = text.Remove(text.LastIndexOf('','')); 

另一种方法是将if 语句放在同一行中
string _str = text.Length>0 && text.Contains('','')?text.Remove(text.LastIndexOf('','')):String.Empty;

Another approach could be to club the if statement in the same line
string _str = text.Length>0 && text.Contains('','')?text.Remove(text.LastIndexOf('','')):String.Empty;

首先，您没有调用"任何变量，也没有任何全局变量.

如果您对空字符串有疑问，可以随时检查if (text == null) …或if (string.IsNullOrEmpty(text)) …

-SA

First, you do not "call" any variables, and you don''t have any global variables.

If you have a problem with null string, you can always check if (text == null) … or if (string.IsNullOrEmpty(text)) …

—SA

b = dtsubstancename.Rows [i] ["Subs_name"].ToString()+，" + b;

如果(b！=")
{
int backSlashIndex = b.IndexOf(，");
弱正=(backSlashIndex> == 0)? b.Remove(b.LastIndexOf(''，'')):b;

lblwp.Visible = true;
lblrwp.Visible = true;

}

b = dtsubstancename.Rows[i]["Subs_name"].ToString() + "," + b;

if (b != "")
{
int backSlashIndex = b.IndexOf(",");
weaklypositive = (backSlashIndex >= 0) ? b.Remove(b.LastIndexOf('','')) : b;

lblwp.Visible = true;
lblrwp.Visible = true;

}

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