给shp图层添加字段

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);
        }