class A {
string s_out = new string("");
A(ref string s) {
s = s_out;
}
void func() {
s_out = "something";
}
}
class B {
void func() {
string s = null;
A a = new A(ref s);
a.func();
// will s be "something" here? or how would you get that done?
}
}
[.net] c# references and strings and stuff (pointer to string?)
Author
Hi,
I have class A which has a string inside member variable and a function. I have another class B which has a function. I would like to be able to do something like:
Thanks in advance.
No, that won't work. Strings are immutable in C#, and assigning a string literal to a variable simply updates the variable to point to the new reference. It doesn't actually change the value stored at that reference.
There isn't really a direct way to do what you're asking, but if you let us know what you're actually trying to do, we can probably help you out with a solution that works around the problem.
There isn't really a direct way to do what you're asking, but if you let us know what you're actually trying to do, we can probably help you out with a solution that works around the problem.
For what it's worth, StringBuilder works as a mutable string, though as Mike.Popoloski pointed out it would be better to understand what you're trying to achieve first.
In addition to what was said...
"ref" grants the SCOPE access to the pointer. When you assign s = s_out, you're assigning the pointer of s to be the pointer of s_out.
I also don't think you can do ref in constructors... It seems like a bad idea
Instead of referencing the string directly in places, consider making a property on A that returns the updated string, or if you need late binding, make "func()" return the string, and create a delegate to it. (or just train all your code to be able to deal with instances of A and know to call the property on it, whichever makes more sense to you)
"ref" grants the SCOPE access to the pointer. When you assign s = s_out, you're assigning the pointer of s to be the pointer of s_out.
I also don't think you can do ref in constructors... It seems like a bad idea
Instead of referencing the string directly in places, consider making a property on A that returns the updated string, or if you need late binding, make "func()" return the string, and create a delegate to it. (or just train all your code to be able to deal with instances of A and know to call the property on it, whichever makes more sense to you)
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