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How to convert a string with one backslash to three backslashes

I want to convert this string with one backslah:
"{\"PartyCode\":\"99\",\"Name\":\"ooooo\",\"NameEng\":null,\"Note\":null,\"ManagerId\":1,\ParentId\":null,\"PartyStatusId\":1,\"PartyTypeId\":1,\"CenterInfoId\":4177,\"GovernateInfoId\":321,\"LocationInfoId\":25,\"SectorInfoId\":6,\"SectorGroupInfoId\":36,\"SectorCategroyInfoId\":66,\"MainBranch\":null,\"CoordinateX\":null,\"CoordinateY\":null,\"IssueDate\":\"2022-06-08T00: 00:00\"}"
To this string with 3 backslashes:
"{\\\"PartyCode\\\":\\\"99\\\",\\\"Name\\\":\\\"ooooo\\\",\\\"NameEng\\\":null,\\\"Note\\\":null,\\\"ManagerId\\\":1,\\\"ParentId\\\":null,\\\"PartyStatusId\\\":1,\\\"PartyTypeId\\\":1,\\\"CenterInfoId\\\":4177,\\\"GovernateInfoId\\\":321,\\\"LocationInfoId\\\":25,\\\"SectorInfoId\\\":6,\\\"SectorGroupInfoId\\\":36,\\\"SectorCategroyInfoId\\\":66,\\\"MainBranch\\\":null,\\\"CoordinateX\\\":null,\\\"CoordinateY\\\":null,\\\"IssueDate\\\":\\\"2022-06-08T00: 00:00\\\"}"
I tried .Replace("\\","\\\\\\") but did not work.

I enjoyed
//classical
string input = "{\"PartyCode\":\"99\",\"Name\":\"ooooo\",\"NameEng\":null,\"Note\":null,\"ManagerId\":1,\"ParentId\":null,\"PartyStatusId\":1,\"PartyTypeId\":1,\"CenterInfoId\":4177,\"GovernateInfoId\":321,\"LocationInfoId\":25,\"SectorInfoId\":6,\"SectorGroupInfoId\":36,\"SectorCategroyInfoId\":66,\"MainBranch\":null,\"CoordinateX\":null,\"CoordinateY\":null,\"IssueDate\":\"2022-06-08T00: 00:00\"}";
string output = input.Replace("\"", #"\\\""");
Console.WriteLine(output);
//or extreme something like this
StringBuilder output2 = new StringBuilder();
input.Select(x=> {
if (x.ToString() == "\"")
output2.Append(#"\\\""");
else
output2.Append(x);
return x;
}).ToArray();
Console.WriteLine(output2.ToString());

The string is immutable creates a new string each time. So you have to reassign new string to the previous variable. Also instead of ("\ \ ", use (" \ " ",
var str = "{\"PartyCode\":\"99\",\"Name\":\"ooooo\",\"NameEng\":null,\"Note\":null,\"ManagerId\":1,\"ParentId\":null,\"PartyStatusId\":1,\"PartyTypeId\":1,\"CenterInfoId\":4177,\"GovernateInfoId\":321,\"LocationInfoId\":25,\"SectorInfoId\":6,\"SectorGroupInfoId\":36,\"SectorCategroyInfoId\":66,\"MainBranch\":null,\"CoordinateX\":null,\"CoordinateY\":null,\"IssueDate\":\"2022-06-08T00: 00:00\"}";
str = str.Replace("\"", "\\\\\\\"");

Your original string is escaping the double quotes.
Your desired string is escaping the double quotes, and adding an escaped backslash preceeding the double quotes.
So to get your desired string, you need to ensure that you preceed every double quote with a backslash.
You could do that with .Replace(#"""", #"\""").
Also note that your original string is missing a double quote before ParentId.

How to quote \" (slash double-quote) in a string literal?

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.

Problem with String Verbatim

I use C#.
I need assign a value to a string as verbatim.
Here my code:
string verbatim = "#<META NAME="ROBOTS" CONTENT="NOINDEX, NOFOLLOW">";
or
string verbatim = #"<META NAME=""ROBOTS"" CONTENT=""NOINDEX, NOFOLLOW"">";
But it does not work.
What I'm doing wrong here? Thanks

You mean a verbatim string literal? Double-up the internal quotes and move the #:
string verbatim = #"<META NAME=""ROBOTS"" CONTENT=""NOINDEX, NOFOLLOW"">";

The # charctaer goes outside the string ath beginning and you need to escape your quotes, i.e.
string verbatim = #"<META NAME=""ROBOTS"" CONTENT=""NOINDEX, NOFOLLOW"">"

The # must be outside the string and you need to use double quotes:
string verbatim = #"<META NAME=""ROBOTS"" CONTENT=""NOINDEX, NOFOLLOW"">";

How can i declare ^\ in a string or character

I would like to declare ^\ this as a string or character. I used the below but i am getting an error
string str="^\";
So can any one help me

You have to escape the backslash.
string str = "^\\";
Or, you can use the verbatim syntax.
string str = #"^\";

\ is the escape token, you have to double it to use it as a literal in a string:
string str = "^\\";
Alternatively, you can use literal string syntax:
string str = #"^\";

You need to escape backslash characters, so instead of:
string str = "^\";
use:
string str = "^\\";

I have no idea about C#, but can you try:
string str="^\\";

How to create a string with special characters in C#

How can I create a string which contains the following:
<Object type="System.Windows.Forms.Form

Use an escape character for the quote:
string temp = "<Object type=\"System.Windows.Forms.Form"
See the msdn article for more examples:
http://msdn.microsoft.com/en-us/library/h21280bw.aspx
Edit
Correct link for C#: C# programming guide

You have two choices, depending on the remainder of the text you want to place into the string:
use the escape character \ within the double-quoted string for any double-quote marks, as the other answers have suggested.
string s = "<Object type=\"System.Windows.Forms.Form";
use the string-# form, which avoids processing the \ (such as in path names like C:\Temp\Myfile.txt), and then double the double-quote:
string s = #"<Object type=""System.Windows.Forms.Form";
See also: http://msdn.microsoft.com/en-us/library/362314fe(v=vs.71).aspx

You can use the backslash character to escape strings, the example below should fit your needs:
Example:
string test = "<Object type=\"System.Windows.Forms.Form";
MSDN Specification on String Literals / Escaping Literals:
MSDN : String Literals

string s = "<Object type=\"System.Windows.Forms.Form";
Is that what you mean?

var str = "<Object type=\"System.Windows.Forms.Form";

Use backslash to escape.
String str = "<Object type=\"System.Windows.Forms.Forms";