C# 为什么 string.TrimEnd 不只删除字符串中的最后一个字符
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Why string.TrimEnd not removing only last character in string
提问by James
I have string as below
我有如下字符串
2,44,AAA,BBB,1,0,,,
So now i want to remove only last comma in above string. So i want output as
所以现在我只想删除上面字符串中的最后一个逗号。所以我想输出为
2,44,AAA,BBB,1,0,,
I decided to use TrimeEnd as below
我决定使用 TrimeEnd 如下
str.ToString.TrimEnd(',')
But it removed all the commas after 0. So i get output as below
但它删除了 0 之后的所有逗号。所以我得到如下输出
2,44,AAA,BBB,1,0
Why it removes all the 3 commas after 0? I just need to remove last character in string
为什么它会删除 0 之后的所有 3 个逗号？我只需要删除字符串中的最后一个字符
采纳答案by Jon Skeet
Why it removes all the 3 commas after 0?
为什么它会删除 0 之后的所有 3 个逗号？
Because that's what it's documentedto do:
因为这是记录在案的目的：
Return value:
The string that remains after all occurrences of the characters in thetrimCharsparameter are removed from the end of the current string.
返回值：从当前字符串的末尾删除参数中
所有出现的字符后剩余trimChars的字符串。
If you only want the final character removed, you could use:
如果您只想删除最后一个字符，您可以使用：
if (str.EndsWith(","))
{
str = str.Substring(0, str.Length - 1);
}
Or equivalently:
或等效地：
if (str.EndsWith(","))
{
str = str.Remove(str.Length - 1);
}
回答by codingbiz
That is expected. String.TrimEndRemoves alltrailing occurrences of a set of characters specified in an array from the current String object
这是预期的。从当前 String 对象中String.TrimEnd删除数组中指定的一组字符的所有尾随出现
The TrimEnd(char[] trimChars)method removes from the current string all trailing characters that are in the trimCharsparameter. The trim operation stops when the first character that is not in trimCharsis encounteredat the end of the string
该TrimEnd(char[] trimChars)方法从当前字符串中删除trimChars参数中的所有尾随字符。当trimChars在字符串末尾遇到第一个不在的字符时，修剪操作停止
Use this instead:
改用这个：
str = str.EndsWith(",") ? str.Substring(0, str.Length - 1) : str;
回答by Vishal
You can use this:
你可以使用这个：
string s = "2,44,AAA,BBB,1,0,,,";
s = s.Remove(s.Length-1, 1);
回答by m.r226
Remember Please, the TrimEnd() is not an inplace function. You should reassign its result to str:
请记住，TrimEnd() 不是就地函数。您应该将其结果重新分配给str：
str = str.TrimEnd(',')
