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In Apple documentation for NSString there is a stringByReplacingCharactersInRange method, however I cannot find this method in Monotouch.
Is this method implementation missing from Monotouch - native API binding?
I need this method to implement some custom string handling logic inside shouldChangeCharactersInRange
There is a discusion about this here: http://stackoverflow.com/questions/7979584/is-there-a-stringbyreplacingcharactersinrange-method-of-nsstring-in-monotouch
A user suggested this code that does what stringByReplacingCharactersInRange do, however I have not tested it thoroughly
string text = field.Text;
result = text.Substring (0, range.Location) + replacement + text.Substring (range.Location + range.Length);
Fixed in maccore master 4017e978ee5da76dd22043b960d1e3c0d593a2b4
This will be part of MonoTouch 5.2. In the mean time you can use the managed workaround.