We Keep Coding

Trying to convert '' in "" format [duplicate]

I have a string variable such as this:
string title = string.empty;
I have to display the content of whatever is passed to it inside a div within double quotes. I have written something like this:
...
...
<div>"+ title +#"</div>
...
...
How can I add the double quotes here? So that it will display like:
"How to add double quotes"

You need to escape them by doubling them (verbatim string literal):
string str = #"""How to add doublequotes""";
Or with a normal string literal you escape them with a \:
string str = "\"How to add doublequotes\"";

So you are essentially asking how to store doublequotes within a string variable? Two solutions for that:
var string1 = #"""inside quotes""";
var string2 = "\"inside quotes\"";
In order to perhaps make it a bit more clear what happens:
var string1 = #"before ""inside"" after";
var string2 = "before \"inside\" after";

If you have to do this often and you would like this to be cleaner in code, you might like to have an extension method for this.
This is really obvious code, but still I think it can be useful to grab it and make you save time.
/// <summary>
/// Put a string between double quotes.
/// </summary>
/// <param name="value">Value to be put between double quotes ex: foo</param>
/// <returns>double quoted string ex: "foo"</returns>
public static string AddDoubleQuotes(this string value)
{
return "\"" + value + "\"";
}
Then you may call foo.AddDoubleQuotes() or "foo".AddDoubleQuotes(), on every string you like.

If I understand your question properly, maybe you can try this:
string title = string.Format("<div>\"{0}\"</div>", "some text");

You can also include the double quotes into single quotes.
string str = '"' + "How to add doublequotes" + '"';

Another note:
string path = #"H:\\MOVIES\\Battel SHIP\\done-battleship-cd1.avi";
string hh = string.Format("\"{0}\"", path);
Process.Start(#"C:\Program Files (x86)\VideoLAN\VLC\vlc.exe ", hh + " ,--play");
The real value of hh, as passed, will be "H:\MOVIES\Battel SHIP\done-battleship-cd1.avi".
When needing double double literals, use: #"H:\MOVIES\Battel SHIP\done-battleship-cd1.avi";
Instead of: #"H:\MOVIESBattel SHIP\done-battleship-cd1.avi";
Because the first literals is for the path name and then the second literals are for the double quotation marks.

Using string interpolation with a working example:
var title = "Title between quotes";
var string1 = $#"<div>""{title}""</div>"; // Note the order of the $#
Console.WriteLine (string1);
Output
<div>"Title between quotes"</div>

If you want to add double quotes to a string that contains dynamic values also. For the same in place of CodeId[i] and CodeName[i] you can put your dynamic values.
data = "Test ID=" + "\"" + CodeId[i] + "\"" + " Name=" + "\"" + CodeName[i] + "\"" + " Type=\"Test\";

You can use $.
Interpolated Strings:
Used to construct strings. An interpolated string looks like a template string that contains interpolated expressions. An interpolated string returns a string that replaces the interpolated expressions that it contains with their string representations. This feature is available in C# 6 and later versions.
string commentor = $"<span class=\"fa fa-plus\" aria-hidden=\"true\"> {variable}</span>";

You could use " instead of ". It will be displayed correctly by the browser.

Use either
&dquo;
<div>&dquo;"+ title +#"&dquo;</div>
or escape the double quote:
\"
<div>\""+ title +#"\"</div>

In C# you can use:
string1 = #"Your ""Text"" Here";
string2 = "Your \"Text\" Here";

string doubleQuotedPath = string.Format(#"""{0}""",path);

An indirect, but simple to understand alternative to add quotes at start and end of string -
char quote = '"';
string modifiedString = quote + "Original String" + quote;

Put a backslash (\) before the double quotes. That should work.

"<i class=\"fa fa-check-circle\"></i>" is used with ternary operator with Eval() data binding:
Text = '<%# Eval("bqtStatus").ToString()=="Verified" ?
Convert.ToString("<i class=\"fa fa-check-circle\"></i>") :
Convert.ToString("<i class=\"fa fa-info-circle\"></i>"

In C#, if we use "" it means that it will indicate the following symbol is not a C# built-in symbol that will used by the developer.
So in a string we need double quotes, meaning we can put "" symbol before double quotes:
string s = "\"Hi\""

With C# 11.0 preview you can use Raw String Literals.
Raw string literals are a new format for string literals. Raw string literals can contain arbitrary text, including whitespace, new lines, embedded quotes, and other special characters without requiring escape sequences. A raw string literal starts with at least three double-quote (""") characters. It ends with the same number of double-quote characters. Typically, a raw string literal uses three double quotes on a single line to start the string, and three double quotes on a separate line to end the string.
string str = """
"How to add double quotes"
""";

Now with C# 11
var string1 = """before "inside" after""";
var string2 = """ "How to add double quotes" """;

If you want to add double quotes in HTML
echo "<p>Congratulations, “" . $variable . "”!</p>";
Output
Congratulations, "Mr John"!

Display "" in a string output

I want to display sth like
string test1 = "test2";
so i would like this to be displayed in a richtextbox, but i don't know how to add " in a string output, i have everything working except the displaying of ""; and its C# :) so it should look like that:
string test2 = "test2";
richTextBox.Text = "string test1 = " + (the ") + test2 + (the ") + ";";

You can use backslashes (\) to "escape" a quotation mark. So this string is actually ":
string s = "\"";
Got it? If you still don't, just remember that when ever you want to write a quotation in a string, write \".
So your text would be something like this
richTextBox.Text = "string test1 = \"test2\";";
See? The outer most two quotes denote a string literal and the inner two quotes actually denote the actual quotes in the string. Also, don't forget the semicolon at the end. (You will be likely to forget this because you saw the semi colon in the string literal. But remember! The semicolon is in the string, it's "fake"!)

You have to escape the character " in your string. In C# in many other languages the escape key is \
So your final string will be :
richTextBox.Text = "string test1 = \"" + test2 + "\";";

You can do this by escaping the " like so \":
richTextBox.Text = "string test1 = \"test2\";"
Which will display:
string test1 = "test2";

String Replace "\\\" with "\"

I have a string that contains sequence of three "\" and I have to replace them with single "\".
the string is:
string sample = "<ArrayOfMyObject xmlns:i=\\\"http://www.w3.org/2001/XMLSchema-instance\\\"";
I have tried, as suggested in other threads, with the following code but it did not work:
string result = sample.Replace(#"\\\",#"\");
string result = sample.Replace("\\\\\\","\\");
thanks in advance

In your sample, your string doesn't actually have three "\" characters in it - Some of them are escape characters.
\ will actually correspond to a single \ character.
\" will actually correspond to a single " character.
The value of your string, in memory, is:-
<ArrayOfMyObject xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"
So, your replace operations do nothing because they do not match anything.

To replace \\\ with \ in a c# string try this code (tested and working)
string strRegex = #"(\\){3}";
string strTargetString = #"sett\\\abc";
var test=Regex.Replace(strTargetString, strRegex, #"\"); //test becomes sett\abc
in debug you will see test=sett\\abc (2 backslashes but one is an escape).
Don't worry and go to text Visualizer and you'll see the correct value
then
in your specific case the code will be
string sample = #"<ArrayOfMyObject xmlns:i=\\\"http://www.w3.org/2001/XMLSchema-instance\\\"";
var result=Regex.Replace(sample , strRegex, #"\");

the output of both of the replaces is
<ArrayOfMyObject xmlns:i=\"http://www.w3.org/2001/XMLSchema-instance\"
this looks correct
but maybe you have to add 6 instead of 3 '\' in your input, because there caracters are escape characters.

split the string containing backward slash and replace with forward slash

I have a string which contains backward slashes and I want to reply it with forward slashes
string filename = "te\test";
var x = filename.Split('\\');
Console.WriteLine(filename);
Console.ReadLine();
I have tried something like this but it is getting the same string "te\test" into x.
Is there any other way to do this?

You original string is not:
te\test
it's:
te{tab}est
\t is the tab character. So you can't split on the \ because you original string doesn't have a \
If you do something like this:
string filename = "te\\test";
var x = filename.Split('\\');
Console.WriteLine(string.Join("/",x));
You'll get the result you wanted.
But you really don't need to Split and Join when you can just Replace:
Console.WriteLine(filename.Replace('\\','/'));
Note: you can use # with your original string to make it a literal string (escapes are ignored) as #Joeb454 suggests (and that's usually what I'll do), but unfortunately the same trick doesn't apply to chars so you can't, for example, do #'\'.

Your initial string appears to be wrong, you're escaping the 't', giving you a tab character, it should be string filename = "te\\test";
You could also declare it as string filename = #"te\test"; - preceding the string with the # sign indicates to the compiler that it's a literal string, and therefore nothing will be escaped.

string filename = "te\test";
string[] x = filename.Split('\\');
Console.WriteLine(filename);//this line should be Console.WriteLine(x[0]+X[1]);
Console.ReadLine();
But I think you are looking for
filename = filename.Replace("\\","/");
Console.WriteLine(filename);

Replace \\ with \ in C#

I have a long string (a path) with double backslashes, and I want to replace it with single backslashes:
string a = "a\\b\\c\\d";
string b = a.Replace(#"\\", #"\");
This code does nothing...
b remains "a\\b\\c\\d"
I also tried different combinations of backslashes instead of using #, but no luck.

Because you declared a without using #, the string a does not contain any double-slashes in your example. In fact, in your example, a == "a\b\c\d", so Replace does not find anything to replace. Try:
string a = #"a\\b\\c\\d";
string b = a.Replace(#"\\", #"\");

In C#, you can't have a string like "a\b\c\d", because the \ has a special meaning: it creates a escape sequence together with a following letter (or combination of digits).
\b represents actually a backspace, and \c and \d are invalid escape sequences (the compiler will complain about an "Unrecognized escape sequence").
So how do you create a string with a simple \? You have to use a backslash to espace the backslash:\\ (it's the espace sequence that represents a single backslash).
That means that the string "a\\b\\c\\d" actually represents a\b\c\d (it doesn't represent a\\b\\c\\d, so no double backslashes). You'll see it yourself if you try to print this string.
C# also has a feature called verbatim string literals (strings that start with #), which allows you to write #"a\b\c\d" instead of "a\\b\\c\\d".

You're wrong. "\\" return \ (know as escaping)
string a = "a\\b\\c\\d";
System.Console.WriteLine(a); // prints a\b\c\d
string b = a.Replace(#"\\", #"\");
System.Console.WriteLine(b); // prints a\b\c\d
You don't even need string b = a.Replace(#"\\", #"\");

this works
You don't even need string b = a.Replace(#"\", #"\");
but like if we generate a dos command through c# code... eg:- to delete a file
this wil help

I did this in a code in a UWP application.
foreach (var item in Attendances)
{
string a = item.ImagePath;
string b = a.Replace(#"\\", "/");
string c = a.Replace("\\", "/");
Console.WriteLine(b);
Console.WriteLine(a);
item.ImagePath = c;
}
and the ones without the # symbol is the one that actually worked. this is C# 8 and C# 9