如何将全局字符串变量从 ASP.NET 页面后面的 C# 代码传递到经典 ASP 页面？

Question

所有，我正在为一个通过电子邮件请求工作订单的网站维护一些旧的 .ASP 代码。该站点运行正常，直到最近迁移到 IIS 7.5 服务器。我不得不重新编码在 ASP.NET 中使用 C# 代码上传文件的部分，并且无法将字符串从新传递到旧。

以前，.ASP 代码使用 ASPupload 组件，出于合理的原因，新的托管服务器不再支持该组件。 ASPupload 用于将两个上传的文件名（通过 JavaScript 作为隐藏输入值）传递给 .ASP 代码的一部分，该部分使用这些文件名作为字符串（加上它已经拥有的路径字符串）。然后 .ASP 代码将文件附加到发送给履行工单的公司的电子邮件中。

我想采用新的 C# 全局字符串变量并将其传递给执行电子邮件发送的旧 .ASP 代码，因为它仍然像一个魅力一样工作。

我已经在这个问题上改进了代码背后和 ASP.NET，以反映 Manoj Kumar Sharma's 出色的 JavaScript，它将 C# 全局字符串变量作为 JavaScript 变量发送到 ASP.NET 代码，我最初遇到了麻烦。谢谢！！！现在我们需要弥合新的 ASP.NET 代码和旧的 .ASP 代码之间的差距。

这是背后的 C# 代码（感谢 Mason 的编辑，现在更新这篇文章要容易得多）：

// From https://support.microsoft.com/en-us/kb/323246
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace CSharpUpload
{
    /// <summary>
    /// Browse to two files, upload to path on Server. Check if files haven't been downloaded, pass name.
    /// </summary>

    public class Scott_upload : System.Web.UI.Page
    {
        protected System.Web.UI.HtmlControls.HtmlInputFile File_Upload_1;
        protected System.Web.UI.HtmlControls.HtmlInputFile File_Upload_2;
        protected System.Web.UI.HtmlControls.HtmlInputButton Submit_Upload;

        public string UpFileName1 { get; set; }
        public string UpFileName2 { get; set; }
        public int File_Count;

        public bool Dont_show_buttons;

        private void Page_Load(object sender, System.EventArgs e)
        {
            // Put user code to initialize the page here

        }

        #region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            // 
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            // 
            InitializeComponent();
            base.OnInit(e);
        }

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {    
            this.Submit_Upload.ServerClick += new System.EventHandler(this.Submit_Upload_ServerClick);
            this.Load += new System.EventHandler(this.Page_Load);
        }
        #endregion

        private void Submit_Upload_ServerClick(object sender, System.EventArgs e)
        {
            bool no_file_selected = true;

            File_Count = 0;

            if( ( File_Upload_1.PostedFile != null ) && ( File_Upload_1.PostedFile.ContentLength > 0 ) )
            {
                string fn_1 = System.IO.Path.GetFileName(File_Upload_1.PostedFile.FileName);
                string server_path_string_1 = @"Data\";
                string SaveLocation_1 = Server.MapPath(server_path_string_1) + fn_1;
                try
                {
                    File_Upload_1.PostedFile.SaveAs(SaveLocation_1);
                    this.UpFileName1 = fn_1;
                    File_Count = File_Count + 1;
                    Dont_show_buttons = true;
                    no_file_selected = false;

                    Response.Write("\nUpload Document 1 \"");
                    Response.Write(fn_1);
                    Response.Write("\" has been SUCCESSFULLY uploaded!\n");
                }
                catch ( Exception ex )
                {
                    Response.Write("Error: " + ex.Message);
                    //Note: Exception.Message returns a detailed message that describes the current exception. 
                    //For security reasons, we do not recommend that you return Exception.Message to end users in 
                    //production environments. It would be better to return a generic error message. 
                }
            }

            if( ( File_Upload_2.PostedFile != null ) && ( File_Upload_2.PostedFile.ContentLength > 0 ) )
            {
                string fn_2 = System.IO.Path.GetFileName(File_Upload_2.PostedFile.FileName);
                string server_path_string_2 = @"Data\";
                string SaveLocation_2 = Server.MapPath(server_path_string_2) + fn_2;
                try
                {
                    File_Upload_2.PostedFile.SaveAs(SaveLocation_2);
                    this.UpFileName2 = fn_2;
                    File_Count = File_Count + 1;
                    Dont_show_buttons = true;
                    no_file_selected = false;

                    Response.Write("\nUpload Document 2 \"");
                    Response.Write(fn_2);
                    Response.Write("\" has been SUCCESSFULLY uploaded!\n");
                }
                catch ( Exception ex )
                {
                    Response.Write("Error: " + ex.Message);
                    //Note: Exception.Message returns a detailed message that describes the current exception. 
                    //For security reasons, we do not recommend that you return Exception.Message to end users in 
                    //production environments. It would be better to return a generic error message. 
                }
            }

            if (no_file_selected)
            {
                Response.Write("\nPLEASE SELECT A FILE TO UPLOAD\n");
            }
        }
    }
}

。这是新的 ASP.NET，它可以将文件名视为“upFileName1”和“upFileName2”：

<%@ Page language="c#" src="Scott_upload.aspx.cs" AutoEventWireup="false" Inherits="CSharpUpload.Scott_upload"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >

<HTML>
  <HEAD>
    <title>Scott_upload</title>
    <meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
    <meta name="CODE_LANGUAGE" Content="C#">
    <meta name=vs_defaultClientScript content="JavaScript">
    <meta name=vs_targetSchema content="http://schemas.microsoft.com/intellisense/ie5">
  </HEAD>
  <body MS_POSITIONING="GridLayout">

        <form id="Scott_file_upload" method="post" enctype="multipart/form-data" runat="server">

            <% if (Dont_show_buttons == false) { %>
                <div>
                    Schedule A&B are required to complete the survey within 3 days.
                    <br><br>
                    Upload Document 1 <INPUT type=file id=File_Upload_1 name=File_Upload_1 runat="server" />
                    <br>
                </div>
                <div>
                    <br>
                    Upload Document 2 <INPUT type=file id=File_Upload_2 name=File_Upload_2 runat="server" />
                    <br>
                </div>
                <div>
                    <br><br>
                    <input type="submit" id="Submit_Upload" value="Click To Upload File(s)" NAME="Submit_Upload" runat="server" />
                    <br>
                </div>
            <% } %>
            <% else { %>
                <div>
                    <br><br>
                    Upload(s) COMPLETE.
                    <br>
                </div>
            <% } %>
        </form>

<script type="text/javascript">

    var upFileName1 = '<%= this.UpFileName1 %>';
    var upFileName2 = '<%= this.UpFileName2 %>';

    ' The code behind filenames are now appearing in the ASP.NET
    document.write(upFileName1);
    document.write(upFileName2);

</script>

</body>
</HTML>

现在是第三个请求的部分，旧的 .ASP 代码。请原谅它，我没有写它，但必须维护它（我对变量名更具体）。首先是从订单请求表单内的 iframe 调用“Scott_upload.aspx”的部分（注意 ASPupload 过去使用的旧隐藏输入“UploadedFile”）：

<html>
<!-- ... -->
<body>
<!-- ... -->
<table class="tblw" border="0" cellpadding="0" cellspacing="0" align="center" ID="Table5">
<tr>
<form name="frmRequest" method="post" action="format_email.asp">
<!-- ... -->
    <table class="tblw" border="0" cellpadding="0" cellspacing="0" align="center" ID="Table13">
    <tr>
        <input type="hidden" name="UploadedFile1" value="" ID="UploadedFile1id">
        <input type="hidden" name="UploadedFile2" value="" ID="UploadedFile2id">
        <td class="container" align="center">
            <iframe src="Scott_upload.aspx" width=520 height=140 name="upload" scrolling="yes" scrollbars="yes" frameborder="0" border="0" style="border:0px;padding:0px;margin:0px;overflow:visible;">
            </iframe>
        </td>
    </tr>
    </table>
<!-- ... -->
    <input type="button" name="btn" value="REQUEST ORDER" class="submitbtn" onClick="validateForm();">
</tr>
</form>
</table>

<% Server.Execute %>

</body>
</html>

现在，其他人编写的旧上传代码对隐藏的输入值（在另一个 iframe 中，在另一个表单中，IKR 中？！）进行了一些 JavaScript 操作，这在我的 .ASPX 中不起作用：

<script language="javascript">

<% If Count = 1 Or Count = 2 Then %>
window.parent.document.getElementById("UploadedFile1id").value = document.frmUpload.FileName1.value;
<% End If %>

<% If Count = 2 Then %>
window.parent.document.getElementById("UploadedFile2id").value = document.frmUpload.FileName2.value;
<% End If %>

</script>

然后在“format_email.asp”文件名字符串用这一行分配：

strUpload1 = Trim(Request.Form("UploadedFile1"))
strUpload2 = Trim(Request.Form("UploadedFile2"))

如何从“Scott_upload.aspx”页面获取“upFileName1”和“upFileName2”以分配给旧“format_email.asp”页面中的“strUpload1”和“strUpload2”？

Answer 1

你可以试试这个：

将这两个变量声明为页面的属性（类似这样）：

public class Scott_upload : System.Web.UI.Page
{
    public string UpFileName1 { get; set; }
    public string UpFileName2 { get; set; }
...

然后在您拥有 javascript 代码的 .ASPX 页面中，将值嵌入到 javascript 变量中（类似这样）：

<script type="text/javascript">

    var upFileName1 = '<%= this.UpFileName1 %>';
    var upFileName2 = '<%= this.UpFileName2 %>';

</script>

希望这会有所帮助。