Create a quantity from composed quantities

[lenyturmel]

Hi all,

I have been reading your samples with a great interest but I am not sure that I could achieve my goals with this lib...

I have a quantity which is described by many values of differents units.
Could you please tell me how can I build the final quantity from all those parts ?

Example:
My volume described as:

• 2 liters
• 9 deciliters
• 3 milliliters
  => the final quantity in liters should be 2,903 L

Thank you
Leny

[angularsen]

Hi, there is no direct support for this in the library today.
The best you can accomplish today, is something like Volume.Parse("2 l") + Volume.Parse("9 dl") + Volume.Parse("3 ml").
Or similar with Volume.FromLiters(2) + .....

[lenyturmel]

thank you, that is a great solution for me

[MuiBienCarlota]

I need a way to parse a string containing an enumeration of same quantity type (for example, "1 h 15 minute").

This could easily be achieved by parsing first "1 h" non greedily from "1 h 15 minute" and returning the number of char consumed (3). We could then iterate and check same quantity and different unit.

This could be usefull in configuration file.

[angularsen]

We actually had this in v3 (#81), and removed support for it in v4
#180 (comment)

It complicated the parsing code quite a bit, and there were some issues like
#343

Also, we realized the feature was mainly used for feet-inches at that time anyways, so it was removed as a generic implementation until.. I guess, until someone came asking for it, like now.

We kept the special parsing as its own method for feet-inches, so this does work:

Length.ParseFeetInches("2' 4\"")

I'm sure this could be revisited, but I still think it is a good idea to distinguish normal Parse() from parsing multiple quantities in the same string.

I don't have the time myself, but if you are interested in attempting a pull request I'm happy to assist.