【20110420-01】AE中对现有FeatureClass添加字段的问题

现在需要对已有的要素图层添加字段，尝试以下代码:

  
    

   
     IFeatureClass pFc
   
     =
   
      ((IFeatureLayer)lyrRec).FeatureClass; 

IFieldsEdit fldsE 
   
     =
   
      pFc.Fields 
   
     as
   
      IFieldsEdit;
IField fld 
   
     =
   
      
   
     new
   
      FieldClass();
IFieldEdit2 fldE 
   
     =
   
      fld 
   
     as
   
      IFieldEdit2;
fldE.Type_2 
   
     =
   
      esriFieldType.esriFieldTypeString;
fldE.Name_2 
   
     =
   
      
   
     "
   
     XXX
   
     "
   
     ;
ic.AddField(fld);


   
     int
   
      idTest 
   
     =
   
      gpsFc.Fields.FindField(
   
     "
   
     XXX
   
     "
   
     );
  
    

调试跟踪，发现IdTest不等于-1 说明执行成功，但是再次启动发现字段未成功添加到要素集

查看帮助 ，对已存在的要素集添加字段 需要用到IClass

  
    

   
     IFeatureClass pFc
   
     =
   
      ((IFeatureLayer)lyrRec).FeatureClass; 
  
    
  
    

   
     IClass pClass=pFc as IClass; 

IFieldsEdit fldsE 
   
     =
   
      pFc.Fields 
   
     as
   
      IFieldsEdit;
IField fld 
   
     =
   
      
   
     new
   
      FieldClass();
IFieldEdit2 fldE 
   
     =
   
      fld 
   
     as
   
      IFieldEdit2;
fldE.Type_2 
   
     =
   
      esriFieldType.esriFieldTypeString;
fldE.Name_2 
   
     =
   
      
   
     "
   
     XXX
   
     "
   
     ;
pClass.AddField(fld);


  
    

再次执行 成功！

AddField is used when creating a fields collection and cannot be used to insert a field into a fields collection belonging to an existing table. To add a field to an existing object class, use the IClass::AddField method.

意思就是说如果修改的是当前已经存在的表或者要数类的字段，那么你就使用IClass::AddField方法生成字段

 

 

新建要素集则不会出现这种情况