I understand that I can call ToString().IndexOf(...), but I don't want to create an extra string. I understand that I can write search routine manually. I just want to know, why does not such routine already exist in the framework.
+1
A:
Unfortunately, many of the methods implemented for String could have been implemented for StringBuilder but that was not done. Consider using extension methods to add what you care about.
binarycoder
2009-08-31 23:57:33
+1
A:
Calling ToString() on a StringBuilder doesn't create an extra object, confusingly. Internally, StringBuilder stores a String object, for performance; calling ToString() simply returns that object.
Michael Petrotta
2009-09-01 00:01:44
this is not correct in the context of the question if the stringbuilder is asked to modify itself Tthen a *new* string is created, the mutability of the internal buffer is not exposed to managed code.
ShuggyCoUk
2009-09-01 00:04:06
@ ShuggyCoUk: my comment was a little glib. I've removed it.
Michael Petrotta
2009-09-01 00:11:15
To clarify the previous comment, there is not much overhead from calling ToString. But after you call it, the next modification to the StringBuilder will incur copying overhead. (This is a valid optimzation because ToString is usually the last thing done to a StringBuilder.) As a result of this, efficient implementations of String-like methods can't use ToString, which precludes a trivial solution to the original poster's issue.
binarycoder
2009-09-01 02:10:23