The following bit of C# code does not seem to do anything:
String str = "{3}";
str.Replace("{", String.Empty);
str.Replace("}", String.Empty);
Console.WriteLine(str);
This ends up spitting out: {3}. I have no idea why this is. I do this sort of thing in Java all the time. Is there some nuance of .NET string handling that eludes me?
The String class is immutable; str.Replace will not alter str, it will return a new string with the result. Try this one instead:
String str = "{3}";
str = str.Replace("{", String.Empty);
str = str.Replace("}", String.Empty);
Console.WriteLine(str);
String is immutable; you can't change an instance of a string. Your two Replace() calls do nothing to the original string; they return a modified string. You want this instead:
String str = "{3}";
str = str.Replace("{", String.Empty);
str = str.Replace("}", String.Empty);
Console.WriteLine(str);
It works this way in Java as well.
Replace actually does not modify the string instance on which you call it. It just returns a modified copy instead.
Try this one:
String str = "{3}";
str = str.Replace("{", String.Empty);
str = str.Replace("}", String.Empty);
Console.WriteLine(str);
Str.Replace returns a new string. So, you need to use it as follows:
String str = "{3}";
str = str.Replace("{", String.Empty);
str = str.Replace("}", String.Empty);
The Replace function returns the modified string, so you have to assign it back to your str variable.
String str = "{3}";
str = str.Replace("{", String.Empty);
str = str.Replace("}", String.Empty);
Console.WriteLine(str);
You'll have to do:
String str = "{3}";
str = str.Replace("{", String.Empty);
str = str.Replace("}", String.Empty);
Console.WriteLine(str);
Look at the String.Replace reference:
Return Value Type: System.String
A String equivalent to this instance but with all instances of oldValue replaced with newValue.
I believe that str.Replace returns a value which you must assign to your variable. So you will need to do something like:
String str = "{3}";
str = str.Replace("{", String.Empty);
str = str.Replace("}", String.Empty);
Console.WriteLine(str);
The Replace method returns a string with the replacement. What I think you're looking for is this:
str = str.Replace("{", string.Empty);
str = str.Replace("}", string.Empty);
Console.WriteLine(str);
Besides all of the suggestions so far - you could also accomplish this without changing the value of the original string by using the replace functions inline in the output...
String str = "{3}";
Console.WriteLine(str.Replace("{", String.Empty).Replace("}", String.Empty));
