private void AddField(IFeatureClass pFeatureClass, string name, string aliasName, esriFieldType FieldType)        {            //若存在，则不需添加            if(pFeatureClass.Fields.FindField(name) > -1) return ;            IField pField = new FieldClass();            IFieldEdit pFieldEdit = pField as IFieldEdit;            pFieldEdit.AliasName_2 = aliasName;            pFieldEdit.Name_2 = name;            pFieldEdit.Type_2 = FieldType;            IClass pClass = pFeatureClass as IClass;            pClass.AddField(pField);        }