dhl:C# KeyValuePair 的基本用法及结合泛型的用法

C# KeyValuePair<TKey,TValue>的用法。结构体，定义可设置或检索的键/值对。也就是说我们可以通过 它记录一个键/值对这样的值。比如我们想定义一个ID(int类型)和Name(string类型)这样的键/值对，那么可以这 样使用。

model:

    [Serializable]
    public  class LessonClassModels
    {
        public long LessonID { get; set; }
        public long ClassID { get; set; }
        public string ClassName { get; set; }
        public int TeacherUIN { get; set; }
        public int LessonsNum { get; set; }
        public long KID { get; set; }
        /// <summary>
        /// 班级的上课时间列表（第一个为上课时间，第二个为下课时间）
        /// </summary>
        public List<KeyValuePair<DateTime, DateTime>> ClassTimeList { get; set; }            
    }

 

 

 

 业务：

public List<LessonClassModels> GetLessonClassGroupList(long lessonId)
        {
            var repository = RepositoryFactory.GetInstance().GetTaokeRepository();
            IList<LessonClass> lessonClasses = repository.GetAllLessonClassByLessonId(lessonId);
            IEnumerable<IGrouping<long, LessonClass>> groupBy = lessonClasses.GroupBy(u => u.ClassID);

            var list = new List<LessonClassModels>();
            foreach (IGrouping<long, LessonClass> grouping in groupBy)
            {
                var models = new LessonClassModels();
                var classTimeList = new List<KeyValuePair<DateTime, DateTime>>();
                models.ClassID = grouping.Key;
                foreach (LessonClass lessonClass in grouping)
                {
                    models.ClassName = lessonClass.ClassName;
                    models.KID = lessonClass.KID;
                    models.LessonsNum = lessonClass.LessonsNum;
                    models.TeacherUIN = lessonClass.TeacherUIN;
                    var keyPair = new KeyValuePair<DateTime, DateTime>(lessonClass.AttendClassTime, lessonClass.FinishClassTime);
                    classTimeList.Add(keyPair);
                    models.ClassTimeList = classTimeList;
                }
                list.Add(models);
            }
            return list;
        }

 

 

 

 

 

 

页面：

 

<%
        List<LessonClassModels> classList = Model.LessonClassList;
        if (classList != null && classList.Count > 0)
        {
            foreach (var c in classList)
{
%>
            <tr>
              <td valign="top" style="padding:5px 5px;line-height:22px;"><strong><%=c.ClassName%></strong><br />
                每课时<%=lessonSingle.Lesson.LessonTime%>分钟<br />
                课时费：￥<%=lessonSingle.Lesson.Price %>/课时<br />
                课时数：<%=lessonSingle.Lesson.TotalHours%><br />
                学费合计：￥<%=lessonSingle.Lesson.TotalPrice%></td>
              <td valign="top" style="padding:5px 5px;line-height:22px;text-align:center;"><%=c.ClassName%>-<br />
                <%=c.ClassID%></td>
              <td valign="top" style="padding:5px 5px;line-height:22px;text-align:center;">
              <%
                foreach(var time in c.ClassTimeList)
    {
                    %>
                    <%=time.Key.ToString("MM月dd日")%>  <%=time.Key.ToShortTimeString()%>~<%=time.Value.ToShortTimeString()%><br />
                    <%
    }
%>
                11月25日    14:00~15:00<br />
 
                （注：授课时间可以调整）</td>
              <td style="padding:5px 5px;line-height:22px;"><table width="120" border="0" cellspacing="0" cellpadding="0">
                  <tr>
                    <td height="40" style="text-align:center;"><img src="/images/baoming.gif" width="92" height="28" /></td>
                  </tr>
                  <tr>
                    <td height="40" style="text-align:center;"><img src="/images/sqsy.gif" width="92" height="28" /></td>
                  </tr>
                  <tr>
                    <td height="40" style="text-align:center;"><img src="/images/pts2.gif" width="92" height="28" /></td>
                  </tr>
                </table></td>
            </tr>
            <%
}
}
        else
        {
            Response.Write("<tr><td></td><td>无班级</td><td></td><td></td></tr>");
        }
%>