[英]How to convert a string to a datetime
我建立了一个查询,该查询使用均为datetime类型的开始日期和结束日期。 然后,我还有另一个名为innerPastTime的变量,该变量应该接收字符串并基于返回的多个小时进行查询。 例如,如果用户输入24,它将在24小时内搜索。
C#
withinthepast.Text = History.QueryInfo.WithinPastTime;
startdatetext.Text = DateTime.Parse(History.QueryInfo.StartDate).ToString("M/d/yyyy");
enddatetext.Text = DateTime.Parse(History.QueryInfo.EndDate).ToString("M/d/yyyy");
ASP视图
<div class="row-fluid">
<div class="span8">
<div class="row">
<div class="span1">
<asp:RadioButton ID="RadioButton1" runat="server" Checked="True" GroupName="DateQuery"/>
</div>
<div class="span11">
<span class="label">Start Date</span><br />
<asp:TextBox ID="startdatetext" runat="server" MaxLength="10"></asp:TextBox>
<asp:Image ID="startimage" runat="server" ImageUrl="Images/calender16.png" />
<!-- note: do not add and ID attribute to the AJAX:CalenderExtender -->
<%-- <ajax:CalenderExtender runat="server" TargetControlID="startdatetext" PopupButtonID="startimage" />--%>
</div>
</div>
<div class="row">
<div class="span1">
</div>
<div class="span11">
<span class="label"> End Date </span><br />
<asp:TextBox ID="enddatetext" Enabled="true" runat="server" MaxLength="10"></asp:TextBox>
<asp:Image ID="endimage" runat="server" ImageUrl="Images/calender16.png" />
<!-- note: do not add and ID attribute to the AJAX:CalenderExtender -->
<%-- <AJAX:CalenderExtender runat="server" TargetControlID="enddatetext" PopupButtonID="endimage" />--%>
</div>
</div>
<br />
OR
<br />
<br />
<div class="row">
<div class="span1">
<asp:RadioButton ID="RadioButton2" runat="server" GroupName="DateQuery"/>
</div>
<div class="span11">
<span class="label">Within the past (hours)</span><br />
<asp:TextBox ID="withinthepast" Enabled="true" runat="server" Text="1"></asp:TextBox>
<asp:Image ID="upimage" runat="server" ImageUrl="Images/arrowup16.png" />
<asp:Image ID="downimage" runat="server" ImageUrl="Images/arrowdown16.png" />
<!-- note: do not add and ID attribute to the NumericUpDownExtender -->
<ajax:NumericUpDownExtender runat="server" Minimum="1" Width="75"
TargetControlID="withinthepast" TargetButtonUpID="upimage" TargetButtonDownID="downimage" />
</div>
</div>
</div>
<div class="span4">
<div class="btn-group btn-group-vertical" data-toggle="buttons-checkbox">
<span class="label" style="margin-top: 5px;">Dates in Range</span>
<asp:CheckBoxList ID="timerange" runat="server" style="border-style:solid;float:left;border-width:1px;margin:10px;" Width="120px">
<asp:ListItem Text="Scheduled At" Selected="True"></asp:ListItem>
<asp:ListItem Text="Scheduled For" Selected="True"></asp:ListItem>
<asp:ListItem Text="Submitted" Selected="True"></asp:ListItem>
<asp:ListItem Text="Started" Selected="True"></asp:ListItem>
<asp:ListItem Text="Completed" Selected="True"></asp:ListItem>
</asp:CheckBoxList>
</div>
</div>
</div>
DateTime withinthepast = Date.Evaluate(m_Owner.QueryInfo.WithinPastTime, DateTime.Now(- **this is where my withinthepastvariable would go telling DateTime.Now how many hours to subtract));
有什么想法吗?
您可以在lastPastTime内将其切换为int,然后可以使用AddHours ()方法,如下所示:
DateTime.Now.AddHours(withinPastTime);
您可以传递负值以使其回到过去。
这还将限制任何输入为有效数字,其他字符串将引发异常。
我认为您需要的是AddHours :
DateTime.Now.AddHours(-pastHours)
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