使用CompareValidator控件与今天的日期比较用户输入日期 [英] Using the CompareValidator control to compare user input date with today's date

问题描述

hey..i想为当前日期与user..however输入的日期相比，我遇到错误为止。

hey..i would like to compare the current date with the date entered by user..however, i'm encountering errors so far..

我想是这样的：

<asp:TextBox id="txtDate1" runat="server" />    
<asp:CompareValidator runat="server" ErrorMessage="The date must be greater than today"
    ControlToValidate="txtDate1" type="date" 
    ValuetoCompare="DateTime.Today.ToShortDateString()" />

和我得到一个错误，指出值 DateTime.Today.ToShortDateString（）的 ValueToCompare 属性的不能转换为类型日期 我也试过 ValueToCompare =DateTime.Now.Date（）和我有同样的错误消息。

and i got an error stating that the value of DateTime.Today.ToShortDateString() of the ValueToCompare property of "" cannot be converted to type 'date' i also tried ValueToCompare="DateTime.Now.Date()" and i got the same error message.

请帮我，我非常AP preciate它。

please help me and i greatly appreciate it.

推荐答案

你只是使用 ValueToCompare 属性作为一个字符串。你需要的，如果要执行code以获得一个动态值使用ASP标签了。试试这个：

You're just using the ValueToCompare property as a literal string. You need to use ASP tags in it if you want to execute code to get a dynamic value. Try this:

<asp:comparevalidator runat="server" 
  errormessage="The date must be greater than today"
  controltovalidate="txtDate1" type="date" 
  valuetocompare="<%# DateTime.Today.ToShortDateString() %>" />

然后在你的的Page_Load 的方法，叫的Page.DataBind（）。

在页面加载这将执行的DataBinder code，并把该值在引号之间。

This will execute the databinder code when the page is loaded, and put the value in between the quotes.

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