Question

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Static extension methods

So I know that Extension methods are for object instances only as in doing

public static string stringBig(this string inString) {
     return inString.ToUpper();
}

Only works for an instance of string

However I am trying to make something that function like Double.TryParse so that I don’t have to do

Double myDouble = someOtherDouble.DoubleParseDifferent("4.324802348203498");

I’d like to be able to do something like

Double myDouble = Double.DoubleParseDifferent(someRandomString);

Now I know that I can’t actually do this so what would be some alternative methods or ways I could approach this.

Answer 1

The only possible alternative way for implementing TryParse I can think of (since what you’re asking for is not possible) would be creating a normal static method, but returning a nullable.

public static double? TryParseEx(string value) { /* new improved parse code here */ }

var result = TryParseEx("1234.56");

That way you would not need a output parameter like the normal TryParse…

If !result.HasValue, then the parse was not successful. Otherwise, just read the result.Value property to get the parsed result.