How to check string contain blackslash in C#

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I have following strings.

C#

string s = "string contain another string(< a href =\"https:")";
string text = "This is a \"string\" in C#.";
string text1 = "This is a \na test \nb.";

I want to replace "\" with "\\" as I want to pass this value to Postgresql.

How to do that

What I have tried:

C#

s = s.Replace(@"\", @"\\");

if (s.Contains('\\'))
{
    s.Replace(@"\", "\\");
}

Posted 6-Oct-22 19:27pm

Member 15790043

Updated 7-Oct-22 2:59am

PIEBALDconsult

v2

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PIEBALDconsult 7-Oct-22 9:03am

Don't bother with the if, just do the replace.
And remember that strings are immutable.

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OriginalGriff · Answer 1 · 2022-10-06T20:00:00

C# strings use double quotes as a start/end markers, so inside a string there are two ways to include them: escape them with a backslash prefix "\"" or use a verbatim string literal by prefixing the whole string with an @ character and then using two double quotes together:

C#

string a = "Hello \"World\"";
string b = @"Hello ""World""";

In your case because you want to embed backslash characters as well, the verbatim string format is probably best as is completely disables escape characters:

C#

string s = @"string contain another string(< a href =\""https:"")";
string text = @"This is a \""string\"" in C#.";
string text1 = @"This is a \na test \nb.";

Printing these gives the result you want:

string contain another string(< a href =\"https:")
This is a \"string\" in C#.
This is a \na test \nb.

Although I suspect you meant to use

C#

string s = @"string contain another string(<a href=""https:\\"")";

Dario Picca · Answer 2 · 2022-10-06T19:46:00

Solution 1

string s = @"string contain another string(< a href =\""https:"")";
string Result = s.Replace(@"\", "\\");
Console.WriteLine(s);

What is the problem?

Posted 6-Oct-22 19:46pm

Dario Picca

Comments

Member 15790043 7-Oct-22 2:11am

Value for String s is coming dynamically.

Dave Kreskowiak 7-Oct-22 8:16am

So? It's the same code no matter where the string comes from. A string is a string is a string.