问题
No exception is thrown, function just halts at this statement:
int productQuantity = Convert.ToInt32("1.00");
and returns.
What am I doing wrong to convert this float to Int32?
Note: I am running in a BackgroundWorkerThread.
回答1:
An exception is being thrown in this case it's just not being surfaced in the debugger. This string is not in a format that is convertible to an Int32 type and hence throws and exception. You can verify this by wrapping it in a try/catch block if the IDE isn't cooperating.
The best approach here is probably to convert the string to a double and then manually cast it down to an int. This does open the door for data loss due to precision differences. But given your input is in a float style format this is unavoidable if you want the final product to be an int
回答2:
You need to convert it to a double first, and then convert to Int32.
int productQuantity = Convert.ToInt32(double.Parse("1.00"));
回答3:
An exception is thrown, it's just that to see it you have to inspect the RunWorkerCompletedEventArgs.Error property in the event handler for BackgroundWorker.RunWorkerCompleted.
Any exception that is thrown from the background worker's thread when the background work is being done is assigned to that property.
回答4:
FormatException Input string was not in a correct format.
来源：https://stackoverflow.com/questions/3558112/convert-toint32float-fails-when-trying-to-convert-float-to-int32