SharePoint 获取Lookup 字段的值

获取某个List里的Lookup字段的值是很普遍的事，那么我们将它封装起来

获取Lookup字段值的方法：

         /// <summary>
         /// To get lookup field Id or Value
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="item"></param>
         /// <param name="fieldName"></param>
         /// <param name="defaultValue"></param>
         /// <param name="getValueType">0:return Id, 1:return Value</param>
         /// <returns></returns>
         public static T GetLookupField<T>(this SPListItem item, string fieldName, int getValueType, T defaultValue)
         {
             fieldName = fieldName.Replace(" ", ConstVariables.blankSpicalCode);

             if (item[fieldName] == null)
             {
                 return defaultValue;
             }

             var itemElements = Regex.Split(item[fieldName].ToString(), ";#", RegexOptions.IgnoreCase);

             if (itemElements.Length >= )
             {
                 return ConvertTo<T>(itemElements[getValueType], defaultValue);
             }
             else
             {
                 return defaultValue;
             }
         }

调用该方法： <oldPlan是SPListItem>
1. 获取Lookup的ID:

oldPlan.GetLookupField<int>(ConstVariables.PRColumns.ColumnStatus, 0, 0);

2. 获取Lookup的Value:

oldPlan.GetLookupField<string>(ConstVariables.AllBGProfileColumns.ColumnBGName, 1, string.Empty)