Revit.Plugln/FWindSoft/FWindSoft.Revit/Extension/CurveElementExtension.cs

using Autodesk.Revit.DB;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FWindSoft.Revit
{
    public static class CurveElementExtension
    {
        public static GraphicsStyle GetGraphicStyle(this CurveElement curveElement,string styleName)
        {
            var ids = curveElement.GetLineStyleIds();
            var document = curveElement.Document;
            foreach (var id in ids)
            {
                var style=document.GetElement(id) as GraphicsStyle;
                if(style!=null&&styleName== style.Name)
                {
                    return style;
                }
            }
            return null;
        }
        public static GraphicsStyle SetLineStyle(this CurveElement curveElement, Color color, int lineWeight,
            string styleName)
        {
            if (string.IsNullOrWhiteSpace(styleName))
            {
                styleName =string.Format(color.ToString()+"-"+ lineWeight);
            }
            var useStyle = curveElement.GetGraphicStyle(styleName);
            if (useStyle == null)
            {
                var subCategory = curveElement.Document.Settings.Categories.NewSubcategory(curveElement.Category, styleName);
                useStyle = subCategory.GetGraphicsStyle(GraphicsStyleType.Projection);
            }
            useStyle.GraphicsStyleCategory.LineColor = color;
            if (lineWeight > 0)
            {
                useStyle.GraphicsStyleCategory.SetLineWeight(lineWeight, GraphicsStyleType.Projection);
            }
            curveElement.LineStyle = useStyle;
            return useStyle;
        }
    }
}