为FeatureClass添加字段

        /// 

        /// 在为shp文件添加字段时,需要注意字段长度不能过10
        /// 
        /// 
        /// 
        /// 
        /// 
        /// 
        public static int AddFieldToFeatureClass(IFeatureClass pFeatureClass, String pFieldName, String pFieldAliasName, esriFieldType pFieldType)
        {
            IFields pFields = pFeatureClass.Fields;
            if (pFeatureClass.FeatureDataset == null || pFeatureClass.FeatureDataset.Workspace.Type == esriWorkspaceType.esriFileSystemWorkspace) 
            {
                if(pFieldName.Length > 10)
                {
                    MessageBox.Show("本地shp字段长度不能超过10位");
                    return -1;
                }
            }

            if (pFields.FindField(pFieldName) < 0)
            {
                //添加两个Field
                IFieldsEdit pFieldsEdit = pFields as IFieldsEdit;
                IField pField = new Field();
                IFieldEdit pFieldEdit = pField as IFieldEdit;
                //' 设置字段属性
                pFieldEdit.Name_2 = pFieldName;
                pFieldEdit.Type_2 = pFieldType;//字段类型
                pFieldEdit.AliasName_2 = pFieldAliasName;
                pFieldEdit.Editable_2 = true;

                IClass pClass = pFeatureClass as IClass;
                pClass.AddField(pField);
                pFields = pFeatureClass.Fields;//需要重新刷新fields
            }
            return pFields.FindField(pFieldName);
        }