如何使用比较验证器比较两个下拉列表值之间的数据? [英] How to use compare validator to compare the data between two dropdownlists values?

问题描述

我有两个用Year-Dates填充的DropDownLists，在第二个ddls值小于第一个ddls值的情况下，我想显示一条错误消息.

I have two DropDownLists populated with Year-Dates, and I want to show an error message in the case where the second ddls value is less than the first ddls value.

这是我到目前为止使用的代码，它不起作用:

This is the code I have used so far, and it doesn't work:

  <asp:CompareValidator 
       ID="cvEndYear2" Operator="GreaterThan" runat="server" CssClass="text-danger" 
       ValidationGroup="Save" ControlToValidate="ddlEndYear" Display="Dynamic" 
       ValueToCompare="ddlStartYear" ErrorMessage="Greater Than" SetFocusOnError="true">
  </asp:CompareValidator>

推荐答案

您必须指定ControlToCompare和Operator:

<asp:CompareValidator 
   ID="cvEndYear2" Operator="GreaterThan" runat="server" CssClass="text-danger" 
   ValidationGroup="Save" 
   ControlToValidate="ddlEndYear" Display="Dynamic" 
   ControlToCompare="ddlStartYear"
   Operator="GreaterThanEqual"
   Type="Integer"
   ErrorMessage="The end year must be greater/equal the start year" SetFocusOnError="true">
</asp:CompareValidator>

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