当文本框中出现<br>时，dropdownlist选择后出错！

Question

一个页面上包括多个文本框，和dropdownlist，如果文本框中出现<br>时，选择dropdownlist就提示错误“sys.webforms.pagerequestmanagerservererrorexception:an unknown error occurred while processing the request on the server.the status code returned from the server was:500"请帮我看看怎样解决。

Answer 1

aspx代码
  <tr>
                                        
                                                <td bgcolor="#fffbf9" align="right">
                                                    <font color="red">*</font> 招聘岗位：
                                                </td>
                                                <td height="29" colspan="3" align="left" bgcolor="#fffbf9">
                                              
                                                <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
                                                  <ContentTemplate>
                                                    <asp:DropDownList Style="z-index: 0" ID="dropCate" runat="server" OnSelectedIndexChanged="dropCate_SelectedIndexChanged" AutoPostBack="True">
                                                    </asp:DropDownList>
                                                    <asp:DropDownList Style="z-index: 0" ID="dropCate1" runat="server">
                                                    </asp:DropDownList>
                                                     </ContentTemplate>
                                                 </asp:UpdatePanel>
                                                </td>         
                                    </tr> <tr>
                                        <td bgcolor="#fffbf9" align="right">
                                            具体要求：</td>
                                        <td bgcolor="#fffbf9" colspan="3" align="left">
                                            <textarea id="txtDemand" rows="4" cols="50" name="txtIntro" runat="server"></textarea>
                                        </td>
                                    </tr>当具体要求填入<br>时，选择dorpdownlist就出现错误。

Answer 2

带特殊符号时应该进行转义处理，比如用&lt; &gt;代替左右尖括号

Answer 3

 public static string SQLReplace(string ParaValue)
    {
        ParaValue = ParaValue.Replace("+", "").Replace("-", "").Replace("=", "").Replace("%", "").Replace("<", "&gt;").Replace(">", "&lt;").Replace("<>", "").Replace("'", "").Replace("[", "").Replace("]", "").Replace("!", "").Replace("@", "").Replace("#", "").Replace(",", "").Replace(";", "");        return ParaValue;
    }
替换掉

Answer 4

 string strContent = this.txtDescribe.Value;
            strContent = strContent.Replace("<", "&gt;");
            strContent = strContent.Replace(">", "&lt;");
            strContent = strContent.Replace("\n", "<br>");
            strContent = strContent.Replace("  ", "&nbsp;&nbsp;");
            
            comm.Parameters.Add("@job_describe", strContent);我这样写，怎么仍然报错呢？好像还是没有转换过来？

Answer 5

strContent = strContent.Replace("\n", "<br>");
颠倒了吧

Answer 6

<%@ Page EnableEventValidation="false"....>然后再用参考LS各位的