C# add to class in another DLL -

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...is possible?

for example, can add simple function...

public static double deg2rad(double degrees) {     return math.pi / 180 * degrees; }

...to convert class? (using default..."usings") can call

double radians = convert.deg2rad(123);

can done? if so, how?

no can't, can add extension method double , call like

double x = 180.0; double y = math.cos( x.deg2rad() ); double z = math.sin( 0.5.pi() );

in static class add following extension method:

public static class extensionmethods {     public static double deg2rad(this double angle)     {         return math.pi*angle/180.0;     }      public static double pi(this double x)     {         return math.pi*x;     } }

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