英文:
Get the string backward until it hit certain character
问题
抱歉，如果这个问题之前已经被问过的话。但是我找不到它。
实际上有没有一种方法可以从后往前获取并截取字符串，直到遇到特定的字符？
这是目前正在工作的代码。
string path = "LivingOrganism/Animal/Bird/Chicken.exe";public void SomeFunc(){// 从后往前计算字符串，直到遇到分隔符string[] splitted = path.Split(new string[] { "/" }, StringSplitOptions.RemoveEmptyEntries).ToList().ToArray();string combineStr = "";for (int i = 0; i < splitted.Count() - 1; i++)combineStr += splitted[i] += "/";path = combineStr;print("results: " + path);}
所以每次调用SomeFunc()时；
第一次调用是 LivingOrganism/Animal/Bird/
第二次调用是 LivingOrganism/Animal/
第三次调用是 LivingOrganism/
第四次调用是
这正是我想要做的。
然而，是否实际上有一种优化的方法呢？
感觉有点丑陋，我需要先拆分字符，然后在循环中重新组合它们。
英文:
Sorry if this question has been asked before. But I am unable to find it.
Is there actually a way to get and cut the string from backwards until it hit certain char ?
This is currently a working code.
string path = "LivingOrganism/Animal/Bird/Chicken.exe";public void SomeFunc(){//count the string from the back until it hit the seperatorstring[] splitted = path.Split(new string[] { "/" }, StringSplitOptions.RemoveEmptyEntries).ToList().ToArray();string combineStr = "";for (int i = 0; i < splitted.Count()-1; i++)combineStr += splitted[i] += "/";path = combineStr;print("results: " + path);}
So everytime SomeFunc() is called;
<br>
first call is LivingOrganism/Animal/Bird/
<br>
second call is LivingOrganism/Animal/
<br>
third call is LivingOrganism/
<br>
fourth call is
<br>
which is what i intended to do.
however, is there actually a way to optimize this. ?
feels kinda ugly that i need to split the char first and the recombine them in forloop
答案1
得分: 2
你可以尝试使用LastIndexOf和Substring。类似以下的代码：
void SomeFunc1(){string result;if (path.Length == 0){result = path;}else{var lastIndexOf = path.LastIndexOf("/", path.Length - 2);result = lastIndexOf switch{>= 0 => path.Substring(0, lastIndexOf + 1),_ => string.Empty};}Console.WriteLine("results: " + result);path = result;}
请注意，System.IO提供了路径操作函数，所以你也可以尝试简化为：
void SomeFunc1(){path = Path.GetDirectoryName(path);Console.WriteLine(path);}
英文:
You can try using LastIndexOf and Substring. Something like the following:
void SomeFunc1(){string result;if (path.Length == 0){result = path;}else{var lastIndexOf = path.LastIndexOf("/",path.Length - 2);result = lastIndexOf switch{>= 0 => path.Substring(0, lastIndexOf + 1),_ => string.Empty};}Console.WriteLine("results: " + result);path = result;}
Note that System.IO provides path manipulation functions so you can also try just:
void SomeFunc1(){path = Path.GetDirectoryName(path);Console.WriteLine(path);}
答案2
得分: 0
这是一个应该能工作的代码片段。可能有更好的解决方案。
string path = "LivingOrganism/Animal/Bird/Chicken.exe";public void SomeFunc(){for(int i=path.Length-1;i>=0;i--){if(path[i] == '/' || i==0){path = path.Remove(i);break;}}Console.WriteLine("结果: " + path);}
英文:
Here is a code snippet that should work. There are probably better solutions.
string path = "LivingOrganism/Animal/Bird/Chicken.exe";public void SomeFunc(){for(int i=path.Length-1;i>=0;i--){if(path[i] == '/' || i==0){path = path.Remove(i);break;}}Console.WriteLine("results: " + path);}
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