Code
using System;
using System.Collections.Generic;
using RecordManagement;

/// <summary>
/// 用户进行一次记录检索后得到的结果集
/// </summary>
public class RecordRetrieveItem<TRecord>
    where TRecord : IRecord<TRecord>
{
    #region 成员

    private int _totalNum;
    private int _retrievedNum;
    private List<TRecord> _records;
    
    #endregion

    #region 属性

    /// <summary>
    /// 记录源总数是多少
    /// </summary>
    public int TotalNum
    {
        get
        {
            return _totalNum;
        }
    }

    /// <summary>
    /// 当前获取了多少条记录
    /// </summary>
    public int RetrievedNum
    {
        get
        {
            return _retrievedNum;
        }
    }

    /// <summary>
    /// 当前获取的记录集
    /// </summary>
    public List<TRecord> Records
    {
        get
        {
            return _records;
        }
    }

    #endregion
    #region 构造函数

    public RecordRetrieveItem(int totalNum, int retrievedNum, List<TRecord> records)
    {
        _totalNum = totalNum;
        _retrievedNum = retrievedNum;
        _records = records;
    }

    public RecordRetrieveItem()
    {

    }

    #endregion
    
    
}

Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Script.Services;

/// <summary>
/// Summary description for TestRecordManager
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ScriptService]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
// [System.Web.Script.Services.ScriptService]
public class TestRecordManager : System.Web.Services.WebService
{

    public TestRecordManager()
    {

        //Uncomment the following line if using designed components 
        //InitializeComponent(); 
    }

    [WebMethod]
    public RecordRetrieveItem<JobRecord> GetRecords(int recordNum,int pageNum)
    {
        RecordManager manager = new RecordManager ();

        List<Record> records = manager.GetAllRecords();

        List<Record> result = records.GetRange(pageNum * recordNum, recordNum);

        return new RecordRetrieveItem<JobRecord>(records.Count,
            result.Count, result);
    }

}