Using \ as a escape character is giving an unexpected output

Question

string sample="How to add doublequotes"; string str = '"'+sample+'"';

This is the output I am getting - "\"How to add doublequotes\"" I want the output as str= "How to add doublequotes" I am using vs code19

When you say "output" what do you mean? Did you run `Console.WriteLine(str)`? — TheSiIence, Dec 19 '20 at 13:02
Try doing str = str.Replace("\",string.empty) You will get the same result - the string you are seeing is just in the debugger. — Alenros, Dec 19 '20 at 15:50

score 1 · Answer 1 · answered Dec 19 '20 at 13:12

1

The output that appears in your debugger is not the output you'll receive on screen.
When printing this out to [Console / API / Website], everything will work as expected.

To see what I mean, try creating a console application with the following code on Main:

static void Main(string[] args)
{
    string str = "\"This is with doublequotes\"";
    Console.WriteLine(str);
}

BTW: You can just write string str = "\"How to add doublequotes\"" and it would still work.

answered Dec 19 '20 at 13:12

TheSiIence

327
2
10

I have to use this in the query string i.e something like this- Select * from tbl where Username=username suppose the value of username="abc" Now, in the query string, it goes as - Select * from tbl where username=abc What its should go as is Select * from tbl where username="abc" I hope you got my point! – Siddharth Kumar Shukla Dec 19 '20 at 13:59
1

@SiddharthKumarShukla the same applies for the query. if `string username = "abc"` then `Select * from tbl where username=\"" + username + "\""` – TheSiIence Dec 19 '20 at 14:47
@Administrator **Do not encourage SQL Injection** – mjwills Dec 19 '20 at 23:05

score -1 · Answer 2 · answered Dec 19 '20 at 13:09

If you use special characters or a newline in your text, you can use verbatim strings. They are denoted, by putting an @ before the string. Within a verbatim string, you don't need to escape special characters anymore, with one exception: the double quotes " need to be escaped using another double quotes:

string sample = @""How to add double quotes"";

When combining verbatim strings with interpolated strings, you ought to put the $ first:

string sample = $@"He said: ""Yes, for sure!"", but was only {p.Value} ÷ sure about it.";

score -1 · Answer 3 · answered Dec 19 '20 at 14:31

-1

Error Resolved by using this-

string query = "select * from customer where country = '" + USERNAME + "'";

Thanks everyone for investing your precious time!

answered Dec 19 '20 at 14:31

Siddharth Kumar Shukla

117
1
5

**Do not do this**. Please read the duplicates. – mjwills Dec 20 '20 at 06:33

Using \ as a escape character is giving an unexpected output

3 Answers3