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Jewel · Jun 12th, 2008, 3:54 PM

I want to declare Timer.Interval from Options menu but got one problem = Cannot implicitly convert type 'string' to 'int'

Thanks.

lectricpharaoh · Jun 13th, 2008, 6:44 AM

I'm not sure what you're trying to ask, here. If it's simply that you have a string like "500", and you want to set an interval of 500, then you can parse the string into an integer. I like using the TryParse() method, because it returns a boolean (true/false) value indicating success, and if it's successful, it will 'fill in' the variable you give it. Here's a quick example:

(Toggle Plain Text)

string intervalString = "500";
int intervalInt;

if( int.TryParse(intervalString, out intervalInt) )
  MessageBox.Show("Value: " + intervalInt.ToString(), "Success");
else
  MessageBox.Show("String did not contain a text representation of an integer", "Error");

See how this works? You pass TryParse() a string, and a reference to the value to be filled in. The out keyword is necessary here; this tells the compiler that you're passing a reference to a value, and that the method you're calling will fill in the value using this reference. It's similar to the ref keyword, except with ref, you have to have the value initialized before the call (note we don't initialize it before calling TryParse()).

Another thing you should know is that all the fundamental types have a TryParse() method. You can use int.TryParse(), double.TryParse(), and so on. They all work in the same manner, with the only difference being the data type. Likewise, there is a Parse() method for built-in types, but I don't much like it, as it throws an exception if the string cannot be converted. I'd rather receive a simple success/failure indication, and handle things that way.

JD-Salinger · Jun 13th, 2008, 7:58 AM

lectricpharaoh is so detailed when he explains his answers in his posts.... very well understood

Jun 12th, 2008, 3:54 PM	#1
Jewel Programmer Join Date: Feb 2008 Posts: 32 Rep Power: 0	declare Timer.Interval from Options I want to declare Timer.Interval from Options menu but got one problem = Cannot implicitly convert type 'string' to 'int' Thanks. __________________ C#

Jun 13th, 2008, 6:44 AM	#2
lectricpharaoh Caffeinated Neural Net Join Date: Jun 2005 Location: Dry west coast of Canada Posts: 1,034 Rep Power: 5	Re: declare Timer.Interval from Options I'm not sure what you're trying to ask, here. If it's simply that you have a string like "500", and you want to set an interval of 500, then you can parse the string into an integer. I like using the `TryParse()` method, because it returns a boolean (true/false) value indicating success, and if it's successful, it will 'fill in' the variable you give it. Here's a quick example: (Toggle Plain Text) string intervalString = "500"; int intervalInt; if( int.TryParse(intervalString, out intervalInt) ) MessageBox.Show("Value: " + intervalInt.ToString(), "Success"); else MessageBox.Show("String did not contain a text representation of an integer", "Error"); string intervalString = "500"; int intervalInt; if( int.TryParse(intervalString, out intervalInt) ) MessageBox.Show("Value: " + intervalInt.ToString(), "Success"); else MessageBox.Show("String did not contain a text representation of an integer", "Error"); See how this works? You pass `TryParse()` a string, and a reference to the value to be filled in. The `out` keyword is necessary here; this tells the compiler that you're passing a reference to a value, and that the method you're calling will fill in the value using this reference. It's similar to the `ref` keyword, except with `ref`, you have to have the value initialized before the call (note we don't initialize it before calling `TryParse()`). Another thing you should know is that all the fundamental types have a `TryParse()` method. You can use `int.TryParse()`, `double.TryParse()`, and so on. They all work in the same manner, with the only difference being the data type. Likewise, there is a `Parse()` method for built-in types, but I don't much like it, as it throws an exception if the string cannot be converted. I'd rather receive a simple success/failure indication, and handle things that way. __________________ And once again, Probability proves itself willing to sneak into a back alley and service Drama as would a copper-piece harlot. - Vaarsuvius, Order of the Stick

Jun 13th, 2008, 7:58 AM	#3
JD-Salinger Unknown Join Date: Apr 2008 Location: unknown Posts: 87 Rep Power: 1	Re: declare Timer.Interval from Options lectricpharaoh is so detailed when he explains his answers in his posts.... very well understood __________________ ------------------------------------------------------------------------- I thought what I'd Do was, I'd pretend to be one of those deaf mutes ------------------------------------------------------------------------

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