从asp文件重定向到aspx文件后无法下载文件

问题描述

我有 asp 经典文件，它重定向到下载 excel 文件的 aspx 文件。

当 asp 重定向到 aspx 文件时，什么也没有发生。

但是如果我得到 aspx 的链接并在新标签中打开它，一切正常：

ASP 代码：

Dim NodeIDsCSV : NodeIDsCSV = ""
Dim NodeIDsCSV = Init_PrepareParams()


Dim sharedSecret : sharedSecret = ""
Dim identityAlias : identityAlias = ""

sharedSecret = GetSharedSecret()

identityAlias = GetIdentityAlias()


Response.Redirect "/testCMS/testCMSv2.aspx?NodeIDsCSV=" & NodeIDsCSV & "&SS=" & sharedSecret & "&IdentityAlias=" & identityAlias 

ASPX 代码：

string[] nodes = NodeIDsCSV.Split(',');
   

    
    //Create a stream for the file
    Stream stream = null;

    //This controls how many bytes to read at a time and send to the client
    int bytesToRead = 100000;

    // Buffer to read bytes in chunk size specified above
    byte[] buffer = new Byte[bytesToRead];
    var fileName = "test.xlsx";
    // The number of bytes read
    try
    {
        //Create a WebRequest to get the file
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
            
        HttpWebRequest fileReq = (HttpWebRequest) HttpWebRequest.Create("--link--to--service--which-returns-the-file");
        fileReq.ProtocolVersion = HttpVersion.Version10;
        //Create a response for this request
        HttpWebResponse fileResp = (HttpWebResponse) fileReq.GetResponse();

        if (fileReq.ContentLength > 0)
            fileResp.ContentLength = fileReq.ContentLength;

        //Get the Stream returned from the response
        stream = fileResp.GetResponseStream();

        // prepare the response to the client. resp is the client Response
        var resp = HttpContext.Current.Response;
        //resp.ClearHeaders();
        //Indicate the type of data being sent
        resp.ContentType = "application/octet-stream";

        //Name the file 
        resp.Clear();
        //resp.Buffer = false;
        //resp.BufferOutput = false;
        
        //Apparently this line helps with old version of IE that like to cache stuff no matter how much you tell them!
        resp.AddHeader("Pragma","public");
        //HttpContext.Current.Response.Write(fileName + "----fileName----");
        resp.AddHeader("Content-disposition","attachment; filename=\"" + fileName + "\"");
        resp.AddHeader("Content-Length",fileResp.ContentLength.ToString());
        resp.AddHeader("Content-transfer-encoding","binary");
        
        int length;


        do
        {
            // Verify that the client is connected.
            
            if (resp.IsClientConnected)
            {
            
                // Read data into the buffer.
                length = stream.Read(buffer,bytesToRead);

                // and write it out to the response's output stream
                resp.OutputStream.Write(buffer,length);
    
                // Flush the data
                //resp.Flush();
                
                //Clear the buffer
                buffer = new Byte[bytesToRead];
                
            }
            else
            {
                // cancel the download if client has disconnected
                length = -1;
            }
        } while (length > 0); //Repeat until no data is read
        
    }

我的问题是什么？你能给我建议一些不同的解决方案吗？

谢谢

解决方法

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