I have a String with a path in it.
It looks like this :
TaskManager = "RegistryKey objRegistryKey = Registry.CurrentUser.CreateSubKey("Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System");"
I want to use this string to compile with codedom, but I get an error saying "cant find Software\Microsoft......".
Is there anyway to replace the " with another char?
I use verbatim string literal for paths so I don't have to double the backslashes:
TaskManager = #"RegistryKey objRegistryKey = Registry.CurrentUser.CreateSubKey(""Software\Microsoft\Windows\CurrentVersion\Policies\System"");"
" is doubled ""
to write " inside a string use \"
String str= "my string with \"quotes\""; // my string with "quotes"
the character \ is used to write special character inside a string for example a \t write inside the string a tab and \n make the string go to a new line
or
String str= #"my string with ""quotes"""; //same as before
the character # before a string make the compiler take the string as is, every special character is written without having to use \ before it, the only character that need to be escaped are the quotes itself that you write by doubling them ""
Watch out that iff you use the method with # your \ \ in the path become \
If you are trying to escape the qoute then do something like this:
TaskManager = "RegistryKey objRegistryKey = Registry.CurrentUser.CreateSubKey(\"Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\");"
Use \"
to get a double quote, the same way as you used \ to get a backslash.
TaskManager = "RegistryKey objRegistryKey = Registry.CurrentUser.CreateSubKey(\"Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System\");"
That should fix it.
you can use it this way
TaskManager = "RegistryKey objRegistryKey = Registry.CurrentUser.CreateSubKey('Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System');"
Related
I have a parameter passed through my url which is as followed:
eu\test5.
When I print this string it says eu est5, it is replacing the \t.
How can I make sure my string is not exaping anything?
I want to grab all the data after the backslash, so I have the value test5.
string user = "eu\test5";
int backslashPos = user.IndexOf("\\");
label2.Text = user.Substring(backslashPos);
Add an # in front of the string or use "\\".
string user = #"eu\test5";
string user = "eu\\test5";
\ is used for escape sequences, which is used for several commands inside a string. Like \n for a New Line
Using an # ignores all escape sequences in a string.
Here is a list of all escape sequences link
\t is an escape sequence representing a set of spaces. So the result you are getting is obvious.
Here is my function, I'm trying to replace a string in a file, but c# tells me my regex is malformed. Any ideas?
public void function(string fileName, string path) {
string pathToAmmend = #"$SERVERROOT\pathpath";
string newPath = #"$SERVERROOT\" + path;
File.WriteAllText(fileName, Regex.Replace(File.ReadAllText(fileName), pathToAmmend, newPath));
....
}
It works if i change the strings to:
string pathToAmmend = #"$SERVERROOT\\pathpath";
string newPath = #"$SERVERROOT\\" + path;
But then I have two slashes and I only want one slash.
It sounds like you don't actually need a regular expression at all. It sounds like you quite possibly just want string.Replace:
// Split into three statements for clarity.
string input = File.ReadAllText(fileName);
string output = input.Replace(pathToAmend, newPath);
File.WriteAllText(output);
Only use regular expressions when you're genuinely trying to match patterns.
A \ is a special escaping character in regular expressions. You have to escape it so that it will be interpreted as a literal \ and not an escape sequence. $ is also a special character (an end anchor), so you'll want to escape that as well.
string pathToAmmend = #"\$SERVERROOT\\pathpath";
Using # to create a verbatim string only means you don't have to escape the \ for the sake of the C# compiler. You still have escape the \ for in a regular expression pattern. Without the verbatim string this would be:
string pathToAmmend = "\\$SERVERROOT\\\\pathpath";
Of course, as Jon Skeet points out, for something this simple, regular expressions aren't really the best way to go here.
I need to replace double quotes with single so that something like this
\\\\servername\\dir1\\subdir1\\
becomes
\\servername\dir1\subdir1\
I tried this
string dir = "\\\\servername\\dir1\\subdir1\\";
string s = dir.Replace(#"\\", #"\");
The result I get is
\\servername\\dir1\\subdir1\\
Any ideas?
You don't need to replace anything here. The backslashes are escaped, that's why they are doubled.
Just like \t represents a tabulator, \\ represents a single \. You can see the full list of Escape Sequences on MSDN.
string dir = "\\\\servername\\dir1\\subdir1\\";
Console.WriteLine(dir);
This will output \\servername\dir1\subdir1\.
BTW: You can use the verbatim string to make it more readable:
string dir = #"\\servername\dir1\subdir1\";
There is no problem with the code for replacing. The result that you get is:
\servername\dir1\subdir1\
When you are looking at the result in the debugger, it's shown as it would be written as a literal string, so a backslash characters is shown as two backslash characters.
The string that you create isn't what you think it is. This code:
string dir = "\\\\servername\\dir1\\subdir1\\";
produces a string containing:
\\servername\dir1\subdir1\
The replacement code does replace the \\ at the beginning of the string.
If you want to produce the string \\\\servername\\dir1\\subdir1\\, you use:
string dir = #"\\\\servername\\dir1\\subdir1\\";
or:
string dir = "\\\\\\\\servername\\\\dir1\\\\subdir1\\\\";
This string "\\\\servername\\dir1\\subdir1\\" is the same as #"\\servername\dir1\subdir1\". In order to escape backslashes you need either use # symbol before string, or use double backslash instead of one.
Why you need that? Because in C# backslash used for escape sequences.
I have already seen the other way around. But this one I can not catch. I am trying to get a part of a web resourcePath and combine it with a local path.
Let me Explain a bit more.
public string GetLocalPath(string URI, string webResourcePath, string folderWatchPath) // get the folderwatcher path to work in the local folder
{
string changedPath = webResourcePath.Replace(URI, "");
string localPathTemp = folderWatchPath + changedPath;
string localPath = localPathTemp.Replace(#"/",#"\");
return localPath;
}
But, When I do this the result is like
C:\\Users
But what I want to have is
C:\Users
Not "\\" but my debug shows it like C:\\Users but in the console it shows it as I expect it.
I want to know the reason for that
thanks..
Because \\ is escape sequence for \
string str = "C:\\Users";
is same as
string str = #"C:\Users";
Later one is known as Verbatim string literal.
For combining paths in code it is better to use Path.Combine instead of manually adding "/"
Your code should be like
public string GetLocalPath(string URI, string webResourcePath,
string folderWatchPath)
{
return Path.Combine(folderWatchPath, webResourcePath.Replace(URI, ""));
}
There is no need to replace / with \ because path names in windows supports both. So C:\Users is same as C:/Users
In C#, \ is special in ""-delimited strings. In order to get a literal \ in a string, you double it. \ is not special in #"" strings, so #"\" and "\\", or #"C:\Users" and "C:\\Users" mean exactly the same thing. The debugger apparently uses the second style in your case.
I believe that debug shows strings with escape chars, and to escape a \ in a non-verbatim (not prefixed with #) string you have to write \\.
This is probably a really simple question but I can't seem to get my head around it. I need to have a string that contains \" without it seeing it as an escape character. I tried using # but it won't work. The only other way I thought of doing this would be to use \u0022 but don't want to unless I can help it.
Desired string - string s = "\"\""; // Obviously this doesn't work!
Desired console output - \"\"
Hope this makes sense.
Thanks!
Try
string s = "\\\"\\\"";
You have to escape your backslashes too.
Mike
You can use the literal, but you need to double-up quotes.
string s = #"\""\""";
In verbatim string literals (#"...") a " in the string value is encoded as "", which happens to also be the only escape sequence in verbatim strings.
#"\""Happy coding!\""" // => \"Happy coding!\"
"\\\"Happy coding!\\\"" // => \"Happy coding!\"
Note that in the 2nd case (not a verbatim string literal), a \ is required before the \ and the " to escape them and prevent their normal meanings.
See the C# string reference for more details and examples.
I think you have to escape backslashes too... so something like "\\\"\\\"" should work, I believe.
Use this string:
string s = "\\\"\\\"";
Console.WriteLine( "\\\"\\\"" );
Just put a \ before each character that needs to be printed.
String s = #"\""\""";
DblQuote characters will escape a second dblquote character
Though for better readability I would go with:
const String DOUBLEQUOTE = """";
const String BACKSLASH = #"\";
String s = BACKSLASH + DOUBLEQUITE + BACKSLASH + DOUBLEQUOTE;
In a verbatim string (a string starting with #"") to escape double quotes you use double quotes, e.g. #"Please press ""Ok"".". If you want to do it with verbatim strings then you would do something like #"\""" (that's 3 double quotes on the end there).
You can do like this,
string s = "something'\\\'";
Use a single '' rather then "" in string to do the same.