i have a controller where i read a html file into a variable.
After read it i replace some values from the variable to other values,
but the problem is that nothing happend.
What is wrong here ?
can someone give me a hand with this?
string path = "/mypath/myfile.html";
string s = System.IO.File.ReadAllText(path);
s.Replace("@%a%@","hi");
s.Replace("@%b%@","yo");
s.Replace("@%c%@","asdfasdf");
s.Replace("@%d%@", "http://www.google.com");
Strings are immutable - you should assign result of replacement to your string. Also you can chain replacement operations like this:
string s = System.IO.File.ReadAllText(path)
.Replace("@%a%@","hi")
.Replace("@%b%@","yo")
.Replace("@%c%@","asdfasdf")
.Replace("@%d%@", "http://www.google.com");
Just keep in mind - all string operations (like Replace, Substring etc) will create and return new string, instead of changing original. Same implies to operations on DateTime and other immutable objects.
UPDATE: You can also declare dictionary of your replacements and update string in a loop:
var replacements = new Dictionary<string, string> {
{ "@%a%@","hi" }, { "@%b%@","yo" }, { "@%c%@","asdfasdf" } // ...
};
string s = System.IO.File.ReadAllText(path);
foreach(var replacement in replacements)
s = s.Replace(replacement.Key, repalcement.Value);
A string is immutable. Basically, an object is immutable if its state doesn’t change once the object has been created. Consequently, a class is immutable if its instances are immutable.
string path = "/mypath/myfile.html";
string s = System.IO.File.ReadAllText(path);
s = s.Replace("@%a%@","hi");
s = s.Replace("@%b%@","yo");
s = s.Replace("@%c%@","asdfasdf");
s = s.Replace("@%d%@", "http://www.google.com");
