3

请求的 Aspx 页面

<%@ Page Title="" Language="C#" MasterPageFile="~/tier6a-educ.master" AutoEventWireup="true"
    EnableEventValidation="false" CodeFile="TAP_rubform_response.aspx.cs" Inherits="TAP_rubform_response" %>

<asp:Content ID="Content1" ContentPlaceHolderID="test1" runat="server">
    <head>
        <link href="StyleSheet.css" type="text/css" rel="Stylesheet" />
    </head>
    <div style="padding-left: 10pt">
        <form id="form1" runat="server">


        <asp:Table ID="Table11" runat="server" Height="16px" Width="845px">
            <asp:TableRow ID="TableRow10" runat="server" orderColor="Gray" BorderWidth="1pt"
                BorderStyle="Dotted" HorizontalAlign="Center">
                <asp:TableCell ID="TableCell10" runat="server" ColumnSpan="2"><h4>SECTION 1: STANDARDS AND OBJECTIVES</h4></asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="table38" runat="server" HorizontalAlign="center" BorderColor="Gray"
            BorderWidth="1pt" BorderStyle="Dotted" Width="850px" Style="line-height: 15pt"
            Font-Names="Trebuchet MS" Font-Size="11pt">
            <asp:TableRow ID="TableRow11" runat="server">
                <asp:TableCell ID="TableCell11" runat="server">
                    <asp:Label ID="Label22" runat="server">Rating &nbsp;       </asp:Label>
                    <asp:Label ID="Label23" Font-Bold="true" runat="server">    </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow ID="TableRow34" runat="server">
                <asp:TableCell ID="TableCell44" runat="server">
                    <asp:Label ID="Label48" runat="server">Evidence &nbsp;       </asp:Label>
                    <asp:Label ID="Label49" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="Table12" runat="server" Height="16px" Width="845px">
            <asp:TableRow ID="TableRow12" runat="server" orderColor="Gray" BorderWidth="1pt"
                BorderStyle="Dotted" HorizontalAlign="Center">
                <asp:TableCell ID="TableCell12" runat="server" ColumnSpan="2"><h4>SECTION 2: Presenting Instructional Content</h4></asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="table2" runat="server" HorizontalAlign="center" BorderColor="Gray"
            BorderWidth="1pt" BorderStyle="Dotted" Width="850px" Style="line-height: 15pt"
            Font-Names="Trebuchet MS" Font-Size="11pt">
            <asp:TableRow ID="TableRow13" runat="server">
                <asp:TableCell ID="TableCell15" runat="server">
                    <asp:Label ID="Label20" runat="server">Rating &nbsp;       </asp:Label>
                    <asp:Label ID="Label21" Font-Bold="true" runat="server">    </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow ID="TableRow39" runat="server">
                <asp:TableCell ID="TableCell49" runat="server">
                    <asp:Label ID="Label58" runat="server">Evidence &nbsp;       </asp:Label>
                    <asp:Label ID="Label59" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="Table13" runat="server" Height="16px" Width="845px">
            <asp:TableRow ID="TableRow14" runat="server" orderColor="Gray" BorderWidth="1pt"
                BorderStyle="Dotted" HorizontalAlign="Center">
                <asp:TableCell ID="TableCell13" runat="server" ColumnSpan="2"><h4>SECTION 3: Lesson Structure and Pacing</h4></asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="table3" runat="server" HorizontalAlign="center" BorderColor="Gray"
            BorderWidth="1pt" BorderStyle="Dotted" Width="850px" Style="line-height: 15pt"
            Font-Names="Trebuchet MS" Font-Size="11pt">
            <asp:TableRow ID="TableRow15" runat="server">
                <asp:TableCell ID="TableCell18" runat="server">
                    <asp:Label ID="Label24" runat="server">Rating &nbsp;       </asp:Label>
                    <asp:Label ID="Label25" Font-Bold="true" runat="server">    </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow ID="TableRow35" runat="server">
                <asp:TableCell ID="TableCell45" runat="server">
                    <asp:Label ID="Label50" runat="server">Evidence &nbsp;       </asp:Label>
                    <asp:Label ID="Label51" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="Table14" runat="server" Height="16px" Width="845px">
            <asp:TableRow ID="TableRow16" runat="server" orderColor="Gray" BorderWidth="1pt"
                BorderStyle="Dotted" HorizontalAlign="Center">
                <asp:TableCell ID="TableCell14" runat="server" ColumnSpan="2"><h4>SECTION 4: Activities and Materials </h4></asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="table4" runat="server" HorizontalAlign="center" BorderColor="Gray"
            BorderWidth="1pt" BorderStyle="Dotted" Width="850px" Style="line-height: 15pt"
            Font-Names="Trebuchet MS" Font-Size="11pt">
            <asp:TableRow ID="TableRow17" runat="server">
                <asp:TableCell ID="TableCell21" runat="server">
                    <asp:Label ID="Label26" runat="server">Rating &nbsp;       </asp:Label>
                    <asp:Label ID="Label27" Font-Bold="true" runat="server">    </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow ID="TableRow36" runat="server">
                <asp:TableCell ID="TableCell46" runat="server">
                    <asp:Label ID="Label52" runat="server">Evidence &nbsp;       </asp:Label>
                    <asp:Label ID="Label53" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="Table21" runat="server" Height="16px" Width="845px">
            <asp:TableRow ID="TableRow18" runat="server" orderColor="Gray" BorderWidth="1pt"
                BorderStyle="Dotted" HorizontalAlign="Center">
                <asp:TableCell ID="TableCell16" runat="server" ColumnSpan="2"><h4>SECTION 5: Academic Feedback</h4></asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="table5" runat="server" HorizontalAlign="center" BorderColor="Gray"
            BorderWidth="1pt" BorderStyle="Dotted" Width="850px" Style="line-height: 15pt"
            Font-Names="Trebuchet MS" Font-Size="11pt">
            <asp:TableRow ID="TableRow19" runat="server">
                <asp:TableCell ID="TableCell24" runat="server">
                    <asp:Label ID="Label28" runat="server">Rating &nbsp;       </asp:Label>
                    <asp:Label ID="Label29" Font-Bold="true" runat="server">    </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow ID="TableRow37" runat="server">
                <asp:TableCell ID="TableCell47" runat="server">
                    <asp:Label ID="Label54" runat="server">Evidence &nbsp;       </asp:Label>
                    <asp:Label ID="Label55" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="Table26" runat="server" Height="16px" Width="845px">
            <asp:TableRow ID="TableRow20" runat="server" orderColor="Gray" BorderWidth="1pt"
                BorderStyle="Dotted" HorizontalAlign="Center">
                <asp:TableCell ID="TableCell59" runat="server" ColumnSpan="2"><h4>SECTION 6: Grouping Students</h4></asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="table6" runat="server" HorizontalAlign="center" BorderColor="Gray"
            BorderWidth="1pt" BorderStyle="Dotted" Width="850px" Style="line-height: 15pt"
            Font-Names="Trebuchet MS" Font-Size="11pt">
            <asp:TableRow ID="TableRow21" runat="server">
                <asp:TableCell ID="TableCell27" runat="server">
                    <asp:Label ID="Label30" runat="server">Rating &nbsp;       </asp:Label>
                    <asp:Label ID="Label31" Font-Bold="true" runat="server">    </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow ID="TableRow38" runat="server">
                <asp:TableCell ID="TableCell48" runat="server">
                    <asp:Label ID="Label56" runat="server">Evidence &nbsp;       </asp:Label>
                    <asp:Label ID="Label57" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="Table32" runat="server" Height="16px" Width="845px">
            <asp:TableRow ID="TableRow40" runat="server" orderColor="Gray" BorderWidth="1pt"
                BorderStyle="Dotted" HorizontalAlign="Center">
                <asp:TableCell ID="TableCell71" runat="server" ColumnSpan="2"><h4>SECTION 7: Teacher Content Knowledge</h4></asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="table7" runat="server" HorizontalAlign="center" BorderColor="Gray"
            BorderWidth="1pt" BorderStyle="Dotted" Width="850px" Style="line-height: 15pt"
            Font-Names="Trebuchet MS" Font-Size="11pt">
            <asp:TableRow ID="TableRow23" runat="server">
                <asp:TableCell ID="TableCell30" runat="server">
                    <asp:Label ID="Label32" runat="server">Rating &nbsp;       </asp:Label>
                    <asp:Label ID="Label33" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow ID="TableRow24" runat="server">
                <asp:TableCell ID="TableCell31" runat="server">
                    <asp:Label ID="Label34" runat="server">Evidence &nbsp;       </asp:Label>
                    <asp:Label ID="Label35" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="Table39" runat="server" Height="16px" Width="845px">
            <asp:TableRow ID="TableRow42" runat="server" orderColor="Gray" BorderWidth="1pt"
                BorderStyle="Dotted" HorizontalAlign="Center">
                <asp:TableCell ID="TableCell91" runat="server" ColumnSpan="2"><h4>SECTION 8: Questioning</h4></asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="table8" runat="server" HorizontalAlign="center" BorderColor="Gray"
            BorderWidth="1pt" BorderStyle="Dotted" Width="850px" Style="line-height: 15pt"
            Font-Names="Trebuchet MS" Font-Size="11pt">
            <asp:TableRow ID="TableRow26" runat="server">
                <asp:TableCell ID="TableCell34" runat="server">
                    <asp:Label ID="Label36" runat="server">Rating &nbsp;       </asp:Label>
                    <asp:Label ID="Label37" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow ID="TableRow27" runat="server">
                <asp:TableCell ID="TableCell35" runat="server">
                    <asp:Label ID="Label38" runat="server">Evidence &nbsp;       </asp:Label>
                    <asp:Label ID="Label39" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="Table45" runat="server" Height="16px" Width="845px">
            <asp:TableRow ID="TableRow50" runat="server" orderColor="Gray" BorderWidth="1pt"
                BorderStyle="Dotted" HorizontalAlign="Center">
                <asp:TableCell ID="TableCell105" runat="server" ColumnSpan="2"><h4>SECTION 9: Thinking</h4></asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="table9" runat="server" HorizontalAlign="center" BorderColor="Gray"
            BorderWidth="1pt" BorderStyle="Dotted" Width="850px" Style="line-height: 15pt"
            Font-Names="Trebuchet MS" Font-Size="11pt">
            <asp:TableRow ID="TableRow29" runat="server">
                <asp:TableCell ID="TableCell38" runat="server">
                    <asp:Label ID="Label40" runat="server">Rating &nbsp;       </asp:Label>
                    <asp:Label ID="Label41" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow ID="TableRow30" runat="server">
                <asp:TableCell ID="TableCell39" runat="server">
                    <asp:Label ID="Label42" runat="server">Evidence &nbsp;       </asp:Label>
                    <asp:Label ID="Label43" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="Table50" runat="server" Height="16px" Width="845px">
            <asp:TableRow ID="TableRow56" runat="server" orderColor="Gray" BorderWidth="1pt"
                BorderStyle="Dotted" HorizontalAlign="Center">
                <asp:TableCell ID="TableCell117" runat="server" ColumnSpan="2"><h4>SECTION 10: Problem Solving</h4></asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="table10" runat="server" HorizontalAlign="center" BorderColor="Gray"
            BorderWidth="1pt" BorderStyle="Dotted" Width="850px" Style="line-height: 15pt"
            Font-Names="Trebuchet MS" Font-Size="11pt">
            <asp:TableRow ID="TableRow32" runat="server">
                <asp:TableCell ID="TableCell42" runat="server">
                    <asp:Label ID="Label44" runat="server">Rating &nbsp;       </asp:Label>
                    <asp:Label ID="Label45" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
            <asp:TableRow ID="TableRow33" runat="server">
                <asp:TableCell ID="TableCell43" runat="server">
                    <asp:Label ID="Label46" runat="server">Evidence &nbsp;       </asp:Label>
                    <asp:Label ID="Label47" Font-Bold="true" runat="server">   </asp:Label>
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        <asp:Table ID="Table15" runat="server" BorderColor="Gray" BorderWidth="1pt" BorderStyle="Dotted"
            Width="850px" HorizontalAlign="Center">
            <asp:TableRow ID="TableRow48" runat="server">
                <asp:TableCell ID="TableCell101" HorizontalAlign="left" ColumnSpan="1" runat="server"
                    Font-Size="Large">
                    <asp:Button ID="Button1" Text="Send As e-Mail" runat="server" OnClick="SendAsEmail_Click"
                        Font-Size="10pt" Height="18pt" Width="90pt" ValidationGroup="onsubmit" />
                </asp:TableCell>
                <asp:TableCell ID="TableCell19" HorizontalAlign="center" ColumnSpan="1" runat="server"
                    Font-Size="Large">
                    <asp:Button ID="Button3" Text="Save As PDF" runat="server" OnClick="SaveAsPDF_Click"
                        Font-Size="10pt" Height="18pt" Width="90pt" ValidationGroup="onsubmit" />
                </asp:TableCell>
            </asp:TableRow>
        </asp:Table>
        </form>
    </div>
</asp:Content>

我有一个 aspx 页面，其中有一个按钮，当用户单击该页面时，该按钮将作为电子邮件发送给用户。

这是我为按钮的点击功能编写的代码

protected void SendasEmail_Click(object sender, EventArgs e)
{
    StringWriter sw = new StringWriter();
    HtmlTextWriter hw = new HtmlTextWriter(sw);
    this.Page.RenderControl(hw);

    SmtpClient smtpClient = new SmtpClient();
    MailMessage message = new MailMessage();

    MailAddress fromAddress = new MailAddress("xxxxx");
    smtpClient.Host = "xxxxxxx";
    smtpClient.Port = 25;
    message.From = fromAddress;
    message.To.Add("xxxxxx");
    message.Subject = "The webpage is below";
    message.IsBodyHtml = true;
    message.Body = sw.ToString();        
    smtpClient.Send(message);
    }

我可以正常接收电子邮件，但页面执行后，显示以下错误。

我绝对页面内只有表单，因为如果上述函数的实现为空，我不会收到任何错误。网页加载正常，单击按钮什么也不做。

一个页面只能有一个服务器端 Form 标签。

说明：执行当前 Web 请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。

异常详细信息：System.Web.HttpException：一个页面只能有一个服务器端 Form 标签。

源错误：

在执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪来识别有关异常起源和位置的信息。

堆栈跟踪：

[HttpException (0x80004005): A page can have only one server-side Form tag.]
   System.Web.UI.Page.OnFormRender() +8721176
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +33
   System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +32
   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +51
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +40
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
   System.Web.UI.Control.Render(HtmlTextWriter writer) +10
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
   System.Web.UI.Control.Render(HtmlTextWriter writer) +10
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +134
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +19
   System.Web.UI.Page.Render(HtmlTextWriter writer) +29
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +27
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +99
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +25
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1266

似乎这个错误是因为我正在调用函数this.Page.RenderControl(hw);

有人对如何解决此问题有任何经验吗？

谢谢你。

4

2 回答 2

3

看起来好像您必须EventValidation在页面上禁用，否则您会收到RegisterForEventValidation can only be called during Render();错误消息。

看起来正在发生的事情是页面被完整呈现到您HtmlTextWriter的Response. 这可能导致 ASP 看到两个 Form 标记并引发错误。解决方案是覆盖Render页面的方法，捕获您想要的 html，将其发送到电子邮件中，并将 html 写入Response要在页面上显示的内容。

这个链接很好地描述了正在发生的事情以及如何覆盖Render。

编辑：您应该能够调用base.Render并捕获输出以写入Response电子邮件以及您的电子邮件。

在您的按钮单击中，设置一个布尔值，指示是否通过电子邮件发送页面：

public void myButton_Click(object sender, EventArgs e)
{
    okayToEmail = true;
}

然后当您覆盖渲染时，将页面渲染为新的HtmlTextWriter，将内容写入页面的HtmlTextWriter，并检查标志的值。如果为真，请通过电子邮件发送内容。

protected override void Render(HtmlTextWriter writer)
{
    var sb = new StringBuilder();
    using (var sw = new StringWriter(sb))
    {
        using (var htw = new HtmlTextWriter(sw))
        {
            base.Render(htw);
            writer.Write(sb.ToString());

            if (okayToEmail)
            {
                using (var message = new MailMessage())
                {
                    message.Body = sb.ToString();
                    ...
                }
            }
        }
    }
}

但请记住：将整个页面写入电子邮件正文可能并不好......它将包括Doctype标签、html和body标签等，这些标签将被大多数（可能所有）电子邮件客户端删除。此外，链接样式表也不起作用，而且我相信大多数电子邮件客户端都会去掉嵌入的样式表。

于 2012-09-04T21:29:59.893 回答
1

有一种标准方法可以拦截和处理发送到浏览器的响应。
如果您想接收此响应并对其进行处理，您应该使用响应过滤器

private void Page_Load(object sender, EventArgs e)
{

  // Filter the text to be rendered as all uppercase.
  Response.Filter = new UpperCaseFilterStream(Response.Filter);
}

该类UpperCaseFilter，一个自定义 Stream 类，它将通过它的所有文本转换为大写。

Asp.net 将调用Write流的方法。您需要在流类中进行一些缓冲，因为它可能会以块的形式接收数据。

于 2012-09-05T04:01:08.173 回答