Solidworks特征数据对象：深入解析

FeatureManager对象的方法提供给我们创建各类特征，如FeatureManager:: FeatureCut4，FeatureManager:: FeatureExtrusion3，用于创建切除及拉伸特征。这种是采用FeatureManager的具体某个方法创建具体某类特征。

其实，FeatureManager还有一个通用方法可以创建各类特征:FeatureManager:: CreateFeature，此方法将传入某个特征的特征数据对象。

特征数据对象是什么？ExtrudeFeatureData2，CircularPatternFeatureData，RefAxisFeatureData都是特征数据对象，ExtrudeFeatureData2对应的是凸台拉伸及切除的特征数据，CircularPatternFeatureData对应的是特征圆周阵列的数据，RefAxisFeatureData对应的基准轴的特征数据。

简单来说，几乎每种特征都有其对应的特征数据对象，其含义可以理解成如下图的特征数据。故虽然我们可以直接通过尺寸修改，去修改某些特征，但是这种方法的修改范围是有限的，而通过特征数据对象，我们可以操作如下图中各特征的各类参数。

image.png

实例1

如下图，获取模型中相关特征的特征数据对象

image.png

代码实例

public static void GetFeatureData(ModelDoc2 SwDoc)
{
     FeatureManager SwFeatMrg = SwDoc.FeatureManager;
     object[] ObjFeats = SwFeatMrg.GetFeatures(true);
     StringBuilder Sb = new StringBuilder("");
     foreach (object ObjFeat in ObjFeats)
     {
          if (ObjFeat is Feature)
          {
             Feature SwFeat = (Feature)ObjFeat;
             string FeatTypeName = SwFeat.GetTypeName2();//
             if (FeatTypeName == "ICE")//
             {
                  ExtrudeFeatureData2 rfd = SwFeat.GetDefinition();
                  if (rfd != null)
                  {
                      Sb.Append("【" + SwFeat.Name + "】特征数据对象: ExtrudeFeatureData2 \r\n");
                  }
             }
             else if (FeatTypeName == "Extrusion")//
             {
                  ExtrudeFeatureData2 efd = SwFeat.GetDefinition();
                  if (efd != null)
                  {
                      Sb.Append("【" + SwFeat.Name + "】特征数据对象:ExtrudeFeatureData2\r\n");
                  }
             }
             else if (FeatTypeName == "RefAxis")//
             {
                   RefAxisFeatureData rafd = SwFeat.GetDefinition();
                   if (rafd != null)
                   {
                       Sb.Append("【" + SwFeat.Name + "】特征数据对象:RefAxisFeatureData\r\n");
                   }
             }
             else if (FeatTypeName == "CirPattern")//
             {
                   CircularPatternFeatureData cpfd = SwFeat.GetDefinition();
                   if (cpfd != null)
                   {
                        Sb.Append("【" + SwFeat.Name + "】特征数据对象:CircularPatternFeatureData\r\n");
                   }
             }
             SwFeat.GetDefinition();
         }
     }
     System.Windows.MessageBox.Show(Sb.ToString().Trim());
}

运行效果

image.png

实例分析

如果需要获得特征对应的特征数据对象，我们先需要通过Feature:: GetTypeName2方法，获得特征对应的特征类型名称，然后有针对性地使用Feature:: GetDefinition方法，获得对应的特征数据对象，从而进一步获取与修改特征对应的参数。

实例2

对装配体中的圆柱与方台进行圆周阵列

image.png

代码示例

public static void CreateCircularPatternByFeatureData(ModelDoc2 SwDoc, string AxiName, List<string> CompontName)
{
    FeatureManager SwFeatMrg = SwDoc.FeatureManager;
    Feature SwAxiFeat = ((AssemblyDoc)SwDoc).FeatureByName(AxiName);
    SwAxiFeat.Select2(false, 2);
    foreach (string compname in CompontName)
    {
         Feature SwComp = ((AssemblyDoc)SwDoc).FeatureByName(compname);
         SwComp.Select2(true, 1);
    }
    LocalCircularPatternFeatureData SwLocalCircularPatternFeatureData = SwFeatMrg.CreateDefinition((int)swFeatureNameID_e.swFmLocalCirPattern);
    SwLocalCircularPatternFeatureData.TotalInstances = 3;
    SwLocalCircularPatternFeatureData.EqualSpacing = true;
    Feature SwCirPattern = SwFeatMrg.CreateFeature(SwLocalCircularPatternFeatureData);
    SwDoc.ClearSelection2(true);
    SwCirPattern.Name = "圆周阵列";
}

运行效果

image.png

实例3

对实例2的阵列结果进行修改，取消方台部件的阵列。

代码示例

public static void ReviseFeatureData(ModelDoc2 SwDoc, string FeatureName, List<string> CompontName)
{
    FeatureManager SwFeatMrg = SwDoc.FeatureManager;
    Feature CircleParFeat = ((AssemblyDoc)SwDoc).FeatureByName(FeatureName);
    LocalCircularPatternFeatureData SwLocalCircularPatternFeatureData = CircleParFeat.GetDefinition();

    foreach (string compname in CompontName)
    {
         Feature SwComp = ((AssemblyDoc)SwDoc).FeatureByName(compname);
         SwComp.Select2(true, 1);
    }
    bool sc = SwLocalCircularPatternFeatureData.AccessSelections(SwDoc, null);
    if (sc)//进入回退编辑状态
    {
         try
         {
              Feature[] CompFeats = new Feature[CompontName.Count];
              for (int i = 0; i < CompontName.Count; i++)
              {
                   Feature SwComp = ((AssemblyDoc)SwDoc).FeatureByName(CompontName[i]);
                   CompFeats[i] = SwComp;
              }
              SwLocalCircularPatternFeatureData.SeedComponentArray = CompFeats;
              CircleParFeat.ModifyDefinition(SwLocalCircularPatternFeatureData, SwDoc, null);
         }
         catch//出错就退出修改
         {
              SwLocalCircularPatternFeatureData.ReleaseSelectionAccess();
         }
     }
}

运行效果

image.png

实例分析：

使用特征数据对象的AccessSelections方法让特征处于编辑状态，此时，即可对特征数据对象中的参数进行修改，所有参数修改完毕后，通过Feature:: ModifyDefinition完成对特征的修改。如果需要取消修改，则使用特征数据对象的ReleaseSelectionAccess方法即可。