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假设我有一个基本的 asp.net C# Web 应用程序,我可以在其中输入不同事件的日期,例如换油。我想为不同的车辆跟踪这个。然后我想计算换油天数的差异。

因此,对于最近的换油,日期差异/时间跨度将从今天开始计算。但是对于以前的换油,我希望在记录集中的每个先前记录之间计算 datediff/timespan。我想,我可以创建一个字段来输入天数,但我认为以编程方式应该很容易,不是吗?

现在,在经典的 ASP 中,我会做这样的事情(事实上,这是我在这个小应用程序的先前版本中所做的):

<%set rs=conn.Execute("select vehiclename,changedate from oilchange order by changedate desc")
do until rs.EOF
dim recordchk,record
recordchk = record
date2=date1
date1=rs("changedate")
if record <> rs("vehcilename") then
record = rs("vehiclename")

end if%>

<%
if record <> recordchk then  
%>


<tr><td colspan="9"><hr color="black"/></td></tr>

<tr><td colspan="9"><b><%=rs("vehiclename") %></b></td></tr>
<tr><td valign="top" width="15%"><%=rs("changedate") %>&nbsp;<i>(<%=datediff("d",rs("changedate"),date()) %> days)</i></td>
</tr>

<%else%>

<tr><td valign="top" width="15%"><%=rs("changedate") %>&nbsp;<i>(<%=datediff("d",rs("changedate"),date2) %> days)</i></td>
</tr>

<%end if%>

<%rs.MoveNext
loop
rs.Close
%>

但是我很难过如何在 ASP.NET 中做

对于不同的车辆,我有一个中继器,然后我在里面嵌套了一个中继器来遍历该车辆的换油记录。浏览换油清单就好了,但我不知道如何计算才能让我换油之间的天数。

所以,这是我的代码隐藏......(你可以看到这不是换油,而是吉他弦的变化。)

protected void guitarrepeateritemdatabound(object sender, RepeaterItemEventArgs e)
    {
        stringsEntities db = new stringsEntities();

        if ((e.Item.ItemType == ListItemType.Item) || (e.Item.ItemType == ListItemType.AlternatingItem))
        {
            Repeater StringChangeRepeater = (Repeater)e.Item.FindControl("StringChangeRepeater");

            HiddenField guitarIDfield = (HiddenField)e.Item.FindControl("guitarIDint");
            int guitarIDint = Convert.ToInt32(guitarIDfield.Value);
            Label changedate = (Label)e.Item.FindControl("changedate");

            TimeSpan timeBetweenChanges = (DateTime.Now - Convert.ToDateTime(changedate));



            var qrystringchangesview = (from s in db.stringchange_view
                                        where s.guitarid == guitarIDint
                                        orderby s.changedate descending
                                        select new
                                        {
                                            guitarID2 = s.guitarid,
                                            s.guitarname,
                                            s.stringname,
                                            s.changedate,
                                            s.gauge

                                        });

            StringChangeRepeater.DataSource = qrystringchangesview;
            StringChangeRepeater.DataBind();

然后是我的 aspx 页面:

 <asp:Repeater ID="GuitarRepeater" runat="server"  OnItemDataBound="guitarrepeateritemdatabound">
<ItemTemplate>
 <tr>
  <td valign="top">
  <asp:HiddenField ID="guitarIDint" runat="server" Value='<%# Eval("guitarID") %>' />

   <asp:LinkButton OnClick="clicktheinstrument" ID="guitarname" runat="server" Font-Bold="true" CommandArgument='<%#Eval ("guitarID") %>' Text='<%# Eval("guitarname") %>' />

   <asp:Repeater runat="server" ID="StringChangeRepeater">
    <ItemTemplate>
    <table><tr><td style="width:100px">
    <asp:Label ID="changedate" runat="server" Text='<%# Eval("changedate","{0:MM/dd/yyyy}") %>'></asp:Label> 
      (<asp:Label ID="timeBetweenChangesLabel" runat="server"></asp:Label>)
       </td><td style="width:200px">
       <asp:Label ID="stringname" runat="server" Text='<%# Eval("stringname") %>'></asp:Label>
       </td><td style="width:100px">
       <asp:Label ID="gauge" runat="server" Text='<%# Eval("gauge") %>'></asp:Label>
       </td></tr></table>
      </ItemTemplate>
      </asp:Repeater>
       </td>
      </tr>
       </ItemTemplate>
       <AlternatingItemTemplate>
       <tr style="background-color: #F7F7F7">
       <td valign="top">
       <asp:HiddenField ID="guitarIDint" runat="server" Value='<%# Eval("guitarID") %>' />

       <asp:LinkButton OnClick="clicktheinstrument" ID="guitarname" runat="server" Font-Bold="true" CommandArgument='<%#Eval ("guitarID") %>' Text='<%# Eval("guitarname") %>' />

       <asp:Repeater runat="server" ID="StringChangeRepeater">
       <ItemTemplate>
       <table><tr><td style="width:100px">
       <asp:Label ID="changedate" runat="server" Text='<%# Eval("changedate","{0:MM/dd/yyyy}") %>'></asp:Label>
       (<asp:Label ID="timeBetweenChangesLabel" runat="server"></asp:Label>)
       </td><td style="width:200px">
      <asp:Label ID="stringname" runat="server" Text='<%# Eval("stringname") %>'></asp:Label>
       </td><td style="width:100px">
       <asp:Label ID="gauge" runat="server" Text='<%# Eval("gauge") %>'></asp:Label>
       </td></tr></table>
        </ItemTemplate>
        </asp:Repeater>
        </td>
        </tr>
       </AlternatingItemTemplate>
        </asp:Repeater>
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1 回答 1

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好吧,我在 asp.net 论坛上得到了答案......我想我会在这里发布它以帮助其他正在做类似事情的人。

foreach (RepeaterItem item in StringChangeRepeater.Items)
            {
                if (item.ItemType == ListItemType.Item || (item.ItemType == ListItemType.AlternatingItem))
                {
                    HiddenField stringchangeIDHidden = item.FindControl("stringchangeID") as HiddenField;
                    int stringchangeID = Convert.ToInt32(stringchangeIDHidden.Value);

                    var getcurrentrecord = (from s in db.stringchange_view
                                            where s.ID == stringchangeID
                                            select new
                                            {
                                                s.changedate

                                            }).First();


                    Label timeBetweenChangesLabel = item.FindControl("timeBetweenChangesLabel") as Label;
                    DateTime changedate1 = Convert.ToDateTime(getcurrentrecord.changedate);
                    TimeSpan changedateSpan = changedateX - changedate1;
                    TimeSpan changedateSpan2 = changedate1 - Convert.ToDateTime(getcurrentrecord.changedate);
                    timeBetweenChangesLabel.Text = changedateSpan.Days.ToString();

                    changedateX = changedate1;



                }

            }
于 2013-01-11T16:30:58.903 回答