我有一个内置的查询,它使用了两种类型的日期时间的开始日期和结束日期。然后我有另一个名为withinPastTime的变量,它应该在一个字符串和查询的基础上花费很多小时。例如,如果用户输入24,它将在24小时内搜索。如何将字符串转换为日期时间
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观点
<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?
正确亨克。我得到的错误是运算符' - '不能应用于'string'类型的操作数。我已经在OP中发布了更多的语法,让你们知道我在看什么。 – Tim
唯一的问题是它在类TextBox:WebControl中,所以它必须是一个字符串。因此,我得到一个错误“不能隐式转换类型'字符串'为'int'。” – Tim
@Tim所以将字符串转换为int。我假设在表单上有一些验证来将条目限制为有效的数字,如果不是,这是一个完美的时间来添加一些! –