How to use input variable when using rhinoapp.runscript?

just for example,I use “circle”,people can creat a circle by easily.but if I want to create a circle by rhinoapp.runscript is hard to pass the Input variable to command,(i donnot like to click point in viewport,since i use a existing points list component )(the reason I insist to use runscript is there are some command has no corresponding API in RhinoCommond,such as"srfseam")

private void RunScript(Point3d point, double radius, ref object A, ref object B)

Rhino.RhinoApp.RunScript("_Circle" + " " + "point" + " " + "radius", true);//failed,donot know to pass the variable
Rhino.Geometry.Circle c = new Rhino.Geometry.Circle(point, radius);//so easy
A = c;


RhinoApp.RunScript and Grasshopper are not the best of friends. If you really want to add geometry to the 3dm file every time a GH document runs, then I suggest you use proper Rhino.Geometry.Circle constructors and add the result to the document using RhinoDoc.Objects.AddXXXX() methods.

Is this about the Surface Seam thing?

thank you David,i have read your code,very helpful!