string replace in c# [duplicate]

Answer 1

url = url.Replace("$abc", "123");

.Replace returns a NEW string - you must assign that back to the original string if you want to change it.

Answer 2

url = url.Replace("$abc", "123");

Answer 3

try

url = url.Replace("$abc", "123");

String.Replace Method

Returns a new string in which all occurrences of a specified Unicode character or String in the current string are replaced with another specified Unicode character or String.

Answer 4

You want

url = url.Replace("$abc", "123");

Replace() returns a new instance of string with the replacement operation done. It (and all other string operations) does not change the original string instance.

Answer 5

You need to set the original string, or a new string, equal to the value returned from String.Replace. Using your example, do this:

string url = "abc=$abc";
url = url.Replace("$abc", "123");

Answer 6

Strings are immutable, meaning it won't change in place. Try assigning the result of replace to another string variable.

string url = "abc=$abc";
string newUrl = url.Replace("$abc", "123");