C# 字符串替换实际上并不替换字符串中的值
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C# string replace does not actually replace the value in the string
提问by John Demetriou
I am trying to replace a part of string with another another string. To be more precise
I have C:\Users\Desktop\Project\bin\Debug
我试图用另一个字符串替换字符串的一部分。更准确地说，我有 C:\Users\Desktop\Project\bin\Debug
and I am trying to replace \bin\Debugwith \Resources\People
我试图取代\bin\Debug与\Resources\People
I have tried the following:
我尝试了以下方法：
path.Replace(@"\bin\Debug", @"\Resource\People\VisitingFaculty.txt");path.Replace("\\bin\\Debug", "\\Resource\\People\\VisitingFaculty.txt");
path.Replace(@"\bin\Debug", @"\Resource\People\VisitingFaculty.txt");path.Replace("\\bin\\Debug", "\\Resource\\People\\VisitingFaculty.txt");
None of the above two seems to work, as the string remains the same and nothing is replaced. Am I doing something wrong?
以上两个似乎都不起作用，因为字符串保持不变并且没有替换任何内容。难道我做错了什么？
采纳答案by John Demetriou
The problem is that strings are immutable. The methods replace, substring etc do not change the string itself. They create a new string and replace it. So for the above code to be correct it should be
问题是字符串是不可变的。方法 replace、substring 等不会改变字符串本身。他们创建一个新字符串并替换它。所以为了上面的代码是正确的，它应该是
path1 = path.Replace("\bin\Debug", "\Resource\People\VisitingFaculty.txt");
Or just
要不就
path = path.Replace("\bin\Debug", "\Resource\People\VisitingFaculty.txt");
if another variable is not needed
如果不需要另一个变量
This answer is also a reminder that strings are immutable. Any change you make to them will in fact create a new string. So keep that in mind with everything that involves strings, including memory management. As stated in the documentation here
这个答案也提醒我们字符串是不可变的。您对它们所做的任何更改实际上都会创建一个新字符串。因此，请记住涉及字符串的所有内容，包括内存管理。如文档中说明这里
String objects are immutable: they cannot be changed after they have been created. All of the String methods and C# operators that appear to modify a string actually return the results in a new string object
String 对象是不可变的：它们在创建后无法更改。所有看似修改字符串的 String 方法和 C# 运算符实际上都返回一个新字符串对象中的结果
回答by PaulG
The path.Replacemethod actually returns a string. You should do the following:
该path.Replace方法实际上返回一个string. 您应该执行以下操作：
path = path.Replace("firstString", "secondString");
回答by SKJ
String.Replace(string,string) returns string.
So, save the new path in some string variable.
因此，将新路径保存在某个字符串变量中。
path = path.Replace("\bin\Debug", "\Resource\People\VisitingFaculty.txt");
