C# Solidworks二次开发：模型中实体Entity相关操作API详解

大家好，今天要讲的一些API是关于实体的相关API。

在开发的过程，很多地方会涉及到实体的相关操作，比如通过实体选中节点。下面就直接开始介绍API：

（1）第一个API为Select4，这个API的含义为选中一个实体，下面是API的官方解释：

输入参数有两个，第一个为ISelectData，第二个为布尔值。

返回值只有一个，成功选中会返回true，失败会返回false。

下面是官方使用的例子：

This example shows how to get data for an offset surface.

//----------------------------------------------------------------------
// Preconditions:
// 1. Open an assembly document that contains a component that
// has a surface offset feature.
// 2. Select the component's surface offset feature.
// 3. Open the Immediate window.
//
// Postconditions: Inspect the Immediate window.
//----------------------------------------------------------------------

using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System.Runtime.InteropServices;
namespace AnalyzeOffsetSurface_CSharp.csproj
{
    partial class SolidWorksMacro
    {

        public void Main()
        {
            ModelDoc2 swModel = default(ModelDoc2);
            SelectionMgr swSelMgr = default(SelectionMgr);
            SelectData swSelData = default(SelectData);
            SurfaceOffsetFeatureData swOffset = default(SurfaceOffsetFeatureData);
            Feature swFeat = default(Feature);
            Entity swEnt = default(Entity);
            object[] vFace = null;
            int i = 0;
            bool bRet = false;
            Component2 comp = default(Component2);
            Component2 swCompFace = default(Component2);

            swModel = (ModelDoc2)swApp.ActiveDoc;
            swSelMgr = (SelectionMgr)swModel.SelectionManager;
            swSelData = (SelectData)swSelMgr.CreateSelectData();
            swFeat = (Feature)swSelMgr.GetSelectedObject6(1, -1);
            swOffset = (SurfaceOffsetFeatureData)swFeat.GetDefinition();
            comp = (Component2)swSelMgr.GetSelectedObjectsComponent3(1, -1);

            Debug.Print("File = " + swModel.GetPathName());
            Debug.Print("CompFeature = " + comp.Name2);
            Debug.Print("  " + swFeat.Name);
            Debug.Print("    Distance       = " + swOffset.Distance * 1000.0 + " mm");
            Debug.Print("    Flip           = " + swOffset.Flip);
            Debug.Print("    FacesCount     = " + swOffset.GetEntitiesCount());

            bRet = swOffset.AccessSelections(swModel, comp);

            swModel.ClearSelection2(true);

            vFace = (object[])swOffset.Entities;

            for (i = 0; i <= vFace.GetUpperBound(0); i++)
            {
                swEnt = (Entity)vFace[i];

Debug.Print(" Entity selected = " + swEnt.Select4(true, null));

                swCompFace = (Component2)swEnt.GetComponent();
                Debug.Print("    Component face = " + swCompFace.Name2);

            }

            swOffset.ReleaseSelectionAccess();

        }

        public SldWorks swApp;

    }
}

（2）第二个为GetType，这个API的含义为获取实体的类型，下面是API的具体解释：

方法没有输入值，返回值为这个实体的类型swSelectType_e。

下面是官方的例子：

This example shows how to get a component from an assembly feature.

//-----------------------------------------------------------------------------
// Preconditions:
// 1. Open an assembly document with at least one component.
// 2. Select a feature in a component in the FeatureManager design tree.
//
// Postconditions: Inspect the Immediate window.
//----------------------------------------------------------------------------
using Microsoft.VisualBasic;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Diagnostics;
using SolidWorks.Interop.sldworks;
using SolidWorks.Interop.swconst;
using System.Runtime.InteropServices;
namespace GetComponentFromFeature_CSharp.csproj
{
    partial class SolidWorksMacro
    {

        public void Main()
        {
            ModelDoc2 swModel = default(ModelDoc2);
            Feature swFeature = default(Feature);
            Entity swEntity = default(Entity);
            bool bValue = false;
            Component2 swComponent = default(Component2);

            // Get active document
            swModel = (ModelDoc2)swApp.ActiveDoc;

            // Check the document is an assembly
            if ((swModel.GetType() != (int)swDocumentTypes_e.swDocASSEMBLY))
            {
                return;
            }

            // Get the feature
            swFeature = (Feature)((SelectionMgr)(swModel.SelectionManager)).GetSelectedObject6(1, -1);

            // Cast the feature to an entity
            swEntity = (Entity)swFeature;

            // Get type through entity interface
            Debug.Print("Entity type as defined in swSelectType_e: " + swEntity.GetType());
            Debug.Assert(swEntity.GetType() == (int)swSelectType_e.swSelBODYFEATURES);

            // Get type through feature interface
            // Feature inherits from Entity, so will actually call Entity::GetType
            Debug.Print("Entity type: " + swFeature.GetType());

            // Get the component for the entity
            swComponent = (Component2)swEntity.GetComponent();

            // Print component details
            Debug.Print(swComponent.Name2);
            Debug.Print("  " + swComponent.GetPathName());

            // Clear the selection lists
            swModel.ClearSelection2(true);

            // Select the feature through the Entity interface
            bValue = swEntity.Select4(false, null);

            // Print the type of the selected object
            Debug.Print("Selected object type as defined in swSelectType_e: " + ((SelectionMgr)(swModel.SelectionManager)).GetSelectedObjectType3(1, -1));
            Debug.Assert(((SelectionMgr)(swModel.SelectionManager)).GetSelectedObjectType3(1, -1) == (int)swSelectType_e.swSelBODYFEATURES);

            // Clear the selection lists
            swModel.ClearSelection2(true);

            // Select the feature through the Feature interface
            bValue = swFeature.Select2(false, 0);

            // Print the type of the selected object
            Debug.Print("Selected object type as defined in swSelectType_e: " + ((SelectionMgr)(swModel.SelectionManager)).GetSelectedObjectType3(1, -1));
            Debug.Assert(((SelectionMgr)(swModel.SelectionManager)).GetSelectedObjectType3(1, -1) == (int)swSelectType_e.swSelBODYFEATURES);

        }

        public SldWorks swApp;

    }
}