[英]C# string comparison failure
My application is failing on a string comparison. 我的应用程序在字符串比较失败。 I have put in a breakpoint and then used the intermediate window of Visual Studio and done the following experiment 我已经放入一个断点然后使用Visual Studio的中间窗口并完成以下实验
subject
"<#MethodResourceObjectives>"
subject.Contains("<#Method")
true
subject.Contains("<#MethodResource")
true
subject.Contains("<#MethodResourceObjectives")
true
subject.Contains("<#MethodResourceObjectives>")
false
This would seem to be impossible, has anyone got a clue what could be happening? 这似乎是不可能的,有没有人知道可能发生什么?
It sounds like there may well be an unprintable character between the "s" and the ">". 听起来“s”和“>”之间可能存在不可打印的字符。
I usually use something like this to show the true contents of a string: 我通常使用这样的东西来显示字符串的真实内容:
for (int i = 0; i < text.Length; i++)
{
Console.WriteLine("{0:x4}", (int) text[i]);
}
That's not as convenient from an immediate window, of course :( 当然,这不是一个直接的窗口方便:(
In fact, just copying and pasting your text into my Unicode Explorer (at the bottom of the page), it looks like this is indeed the problem - you've got a U+200B (zero width space) before the >
. 事实上,直接复制粘贴文本到我的统一资源管理器 (在页面的底部),它看起来像这确实是问题-你有一个U + 200B之前的(零宽度空间) >
。 You need to work out where that's coming from. 你需要弄清楚它来自哪里。
Doing a copy/paste of the text, I can confirm the same behavior. 复制/粘贴文本,我可以确认相同的行为。
Output: 输出:
"<#MethodResourceObjectives>".ToCharArray()
{char[27]}
[0]: 60 '<'
[1]: 35 '#'
[2]: 77 'M'
[3]: 101 'e'
[4]: 116 't'
[5]: 104 'h'
[6]: 111 'o'
[7]: 100 'd'
[8]: 82 'R'
[9]: 101 'e'
[10]: 115 's'
[11]: 111 'o'
[12]: 117 'u'
[13]: 114 'r'
[14]: 99 'c'
[15]: 101 'e'
[16]: 79 'O'
[17]: 98 'b'
[18]: 106 'j'
[19]: 101 'e'
[20]: 99 'c'
[21]: 116 't'
[22]: 105 'i'
[23]: 118 'v'
[24]: 101 'e'
[25]: 115 's'
[26]: 62 '>'
Then 然后
subject.ToCharArray()
{char[28]}
[0]: 60 '<'
[1]: 35 '#'
[2]: 77 'M'
[3]: 101 'e'
[4]: 116 't'
[5]: 104 'h'
[6]: 111 'o'
[7]: 100 'd'
[8]: 82 'R'
[9]: 101 'e'
[10]: 115 's'
[11]: 111 'o'
[12]: 117 'u'
[13]: 114 'r'
[14]: 99 'c'
[15]: 101 'e'
[16]: 79 'O'
[17]: 98 'b'
[18]: 106 'j'
[19]: 101 'e'
[20]: 99 'c'
[21]: 116 't'
[22]: 105 'i'
[23]: 118 'v'
[24]: 101 'e'
[25]: 115 's'
[26]: 8203 '' <--------- input string contains 'garbage'
[27]: 62 '>'
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