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  • 实现数据记录的分页类

    最近用简单的三层架构写代码,虽然代码比较通用,但不够个性化,闲来写了数据记录的分页类,使用起来相对比较通用(想来能写出通用高效的代码真是不容易)

    列出代码:

      1  public class Pagination
      2     {
      3          //分页总数
      4         private int pageCount;
      5         public int PageCount
      6         {
      7             get
      8             {
      9                 return pageCount;
     10             }
     11         }
     12         //分页大小
     13         private int pageSize;
     14         public int PageSize
     15         {
     16             get
     17             {
     18                 return pageSize;
     19             }
     20         }
     21         //目前页号
     22         private int currentPage=1;
     23         public int CurrentPage
     24         {
     25             get
     26             {
     27                 return currentPage;
     28             }
     29             set
     30             {
     31                 currentPage = value;
     32             }
     33         }
     34 
     35         //前一页是否存在标识
     36         private bool flagPrivous;
     37         public bool FlagPrivous
     38         {
     39             get
     40             {
     41                 if (CurrentPage < PageCount + 1 && CurrentPage != 1)
     42                 {
     43                     flagPrivous = true;
     44                 }
     45                 else
     46                 {
     47                     flagPrivous = false;
     48                 }
     49                 return flagPrivous;
     50             }
     51         }
     52         //后一页存在标识
     53         private bool flagNext;
     54         public bool FlagNext
     55         {
     56             get
     57             {
     58                 if (currentPage < pageCount)
     59                 {
     60                     flagNext = true;
     61                 }
     62                 else
     63                 {
     64                     flagNext = false;
     65                 }
     66                 return flagNext;
     67             }
     68         }
     69         private string selectString;
     70         private string whereString;
     71         private string bllClass;
     72         /// <summary>
     73         /// 构造函数
     74         /// </summary>
     75         /// <param name="PageSize">分页的大小</param>
     76         /// <param name="selectString">select子句</param>
     77         /// <param name="orderByString"></param>
     78         /// <param name="table">查询的表/数据库名</param>
     79         public Pagination(int _PageSize,string _selectString,string _whereString,string _bllClass)
     80         {
     81             //初始化字段
     82             this.selectString = _selectString;
     83             this.whereString = _whereString;
     84             this.bllClass = _bllClass;
     85             this.pageSize=_PageSize;
     86 
     87             Assembly assembly = Assembly.Load("TYKY_OA.BLL");
     88             object bllclass = assembly.CreateInstance(bllClass, false);
     89             Type type = assembly.GetType(bllClass);
     90             string[] param = new string[]{whereString}; 
     91             //获取页的总数
     92             int count  =  (int)type.InvokeMember("getRecordCount", BindingFlags.InvokeMethod, null, bllclass, param);
     93             this.pageCount = count / pageSize + ((count % pageSize == 0) ? 0 : 1);         
     94         }
     95        
     96         //返回当前页
     97         public DataSet GetSet()
     98         {
     99             Assembly assembly = Assembly.Load("TYKY_OA.BLL");
    100             object bllclass = assembly.CreateInstance(bllClass, false);
    101             Type type = assembly.GetType(bllClass);
    102             object[] param = new object[]{currentPage,pageSize,selectString,whereString}; 
    103             //获取页的总数
    104             return  (DataSet)type.InvokeMember("GetSet", BindingFlags.InvokeMethod, null, bllclass, param);           
    105         }
    106        
    107     }
    108   


     1 在每个DAL、BLL层添加相应的函数,例如:Salary表格进行分页
     2 1.在DAL层添加:
     3      public int getRecordCount(string whereString)
     4      {
     5          return dal.GetRecordCount(whereString);
     6      }
     7      public DataSet GetSet(int pageIndex, int pageSize, string selectString, string whereString)
     8      {
     9          return dal.GetSet(pageIndex, pageSize, selectString, whereString);
    10      }
    11 2.在BLL层添加
    12  //查询符合条件的记录条数
    13         public int getRecordCount(string whereString)
    14         {
    15             return dal.GetRecordCount(whereString);
    16         }
    17 
    18         public DataSet GetSet(int pageIndex, int pageSize, string selectString, string whereString)
    19         {
    20             return dal.GetSet(pageIndex, pageSize, selectString, whereString);
    21         }
    22 3.初始化分页功能
    23         TYKY_OA.Web.Pagination page = new TYKY_OA.Web.Pagination(pageSize
    24                         , "salaryID,staffID,name,PrevSalary,PresSalary,salaryTime,salaryRange,salaryReason,appendix"
    25                         , "1=1"  //这里是个条件
    26                         , "TYKY_OA.BLL.SalaryRecordInfo"
    27                         );
    28         this.prev.Disabled = !page.FlagPrivous;
    29         this.next.Disabled = !page.FlagNext;
    30         this.pageIndex.Text = "当前第" + page.CurrentPage + "" + "(共" + page.PageCount + "页)";
    31         this.gvSalary.DataSource = page.GetSet();
    32         this.gvSalary.DataBind();
    33         Session["ASRpagenation"] = page;
    34 4.实现分页
    35         TYKY_OA.Web.Pagination page = (TYKY_OA.Web.Pagination)Session["ASRpagenation"];
    36         if (page != null)
    37         {
    38            page.CurrentPage = page.CurrentPage - 1;// -/+ 实现上下页
    39            this.prev.Disabled = !page.FlagPrivous;
    40            this.next.Disabled = !page.FlagNext;
    41            this.pageIndex.Text = "当前第" + page.CurrentPage + "" + "(共" + page.PageCount + "页)";
    42            this.gvSalary.DataSource = page.GetSet();
    43            this.gvSalary.DataBind();
    44            Session["ASRpagenation"] = page;
    45          }

    技术有限,简单记录。

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  • 原文地址:https://www.cnblogs.com/aswater-yuanye/p/3494644.html
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