识别SOLIDWORKS API特征定义和特定类型

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IFeature::GetSpecificFeature2和IFeature::GetDefinition是SOLIDWORKS API方法，返回的是在某些情况下不容易识别和转换为特定类型的调度指针。

以下代码示例允许输出所选特征的定义和特定特征的所有可分配接口。结果输出到VSTA编辑器的Output窗口。

using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System.Runtime.InteropServices;
using System;
using System.Collections.Generic;
using System.Diagnostics;

namespace CodeStack.csproj
{
    public partial class SolidWorksMacro
    {
        public void Main()
        {
            IFeature feat = swApp.IActiveDoc2.ISelectionManager.GetSelectedObject6(1, -1) as IFeature;

            PrintFeatureTypes(feat);
        }

        private void PrintFeatureTypes(IFeature feat) 
        {
            object featDef = feat.GetDefinition();

            if (featDef != null)
            {
                foreach (Type defType in FindSpecificInterfacesFromDispatch(featDef))
                {
                    Debug.Print("特征定义: " + defType.FullName);
                }
            }
            else
            {
                Debug.Print("特征定义: 无");
            }

            object featSpec = feat.GetSpecificFeature2();

            if (featSpec != null)
            {
                foreach (Type specType in FindSpecificInterfacesFromDispatch(featSpec))
                {
                    Debug.Print("特定特征: " + specType.FullName);
                }
            }
            else
            {
                Debug.Print("特定特征: 无");
            }
        }

        private IEnumerable<Type> FindSpecificInterfacesFromDispatch(object disp) 
        {
            if (disp == null) 
            {
                throw new ArgumentNullException("disp");
            }

            Type[] types = typeof(ISldWorks).Assembly.GetTypes();

            foreach (Type type in types) 
            {
                if (type.IsInstanceOfType(disp)) 
                {
                    yield return type;
                }
            }
        }

        public SldWorks swApp;
    }
}