索引和长度必须引用在字符串中的位置? [英] Index and length must refer to a location within the string?
问题描述
我想拿到第50个字母,所以我用了的子
函数来得到它。
I am trying to get the first 50 letters, so I used the subString
function to get it.
正如你所看到的,我用这个code获得它:
As you can see, I used this code to get it:
<%# Eval("BannerDescription").ToString.Substring(1, 50)%>
不过遗憾的是它不工作和错误消息来了:
But unfortunately it's not working and an error message is coming up:
索引和长度必须引用的位置在字符串中。
Index and length must refer to a location within the string.
那么,有没有解决任何其他的方式?
So is there any other way to fix it?
,因为用户是一个谁正在控制数据输入!有的时候,他该怎么输入10个字母其他时候,也许1000的信让我怎么能解决这个?
because the user is the one who is controlling the data entry! some times he gonna enter 10 letters other times maybe 1000 letter so how can i solve this ?
我想他们所有,但我们可以用这种方式:
I tried them all but can we use it this way :
&LT;%#IIF(EVAL(BannerDescription)的ToString()长度和GT; 49,评估和演示(BannerDescription)的ToString()子串(0,49),评估和演示(BannerDescription))%&GT;
感谢。
推荐答案
也许是这样的 -
<%# Eval("BannerDescription").ToString().Substring(0, Math.Min(Eval("BannerDescription").ToString().Length, 50)) %>
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