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- Visual Studio project template for creating Units of Measurement C# class library.
- Units of measurement are generated from design-time T4 text template according to simple definitions in a text file (data model).
- Units of measurement are generated as types (namely
*partial struct*s). Thus, dimensional analysis can be performed as a syntax check at compile time (dimensional issues displayed in Visual Studio as syntax errors). See the example below. - Units of measurement for any of the fundamental dimension i.e.:
*Length*,*Time*,*Mass*,*Temperature*,*ElectricCurrent*,*AmountOfSubstance*,*LuminousIntensity*as well as*Other*(e.g.*Money*for currency units) and any of their combinations. - Arithmetic (+, ++, -, --, *, /) and comparison (==, !=, <, <=, >, >=) operators to perform calculations directly on
*quantities*of unit type. See the example below. - Conversions of
*quantities*to/from other (but compatible) unit types.

double g = 9.80665; // the gravitational acceleration double v = 715.0; // the velocity at which the projectile is launched (AK-47) double h = 0.0; // the initial height of the projectile double angle = degrees * Math.PI / 180.0; // the angle at which the projectile is launched // the time it takes for the projectile to finish its trajectory: double tmax = (v * Math.Sin(angle) + Math.Sqrt((v * Math.Sin(angle)) * (v * Math.Sin(angle)) + 2.0 * g * h));

It is hard to see that the expression for

Now look at the following example. This time, units of measurement are explicitly used as types of the variables (previously used as plain numbers):

var g = (Meter_Sec2)9.80665; // the gravitational acceleration var v = (Meter_Sec)715.0; // the velocity at which the projectile is launched (AK-47) var h = (Meter)0.0; // the initial height of the projectile var angle = (Radian)degrees; // the angle at which the projectile is launched // the time it takes for the projectile to finish its trajectory: Second tmax = (v * UMath.Sin(angle) + UMath.Sqrt((v * UMath.Sin(angle)) * (v * UMath.Sin(angle)) + 2.0 * g * h));

This time the compiler displays "

As you can see, C# strong type checking is not strong enough to detect dimensional inconsistencies, but it can be strengthened by unit of measurement types. Note also that the code with units of measurement applied looks very much like the code based on plain numbers. This may ease switching from one approach (with units) to another (plain numbers).

Last edited Apr 29, 2015 at 7:59 AM by manio, version 18