由于代码已经过优化或者本机框架位于调用堆栈之上，无法计算表达式的值

Question

System.IO.FileInfo file = new System.IO.FileInfo(path);
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment;   filename=" + file.Name);
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.WriteFile(file.FullName);
           
Response.End();//报错
//由于代码已经过优化或者本机框架位于调用堆栈之上，无法计算表达式的值

Answer 1

Response.WriteFile(file.FullName);
         
/* 加下面两句试下 */
Response.Flush();  
Response.Clear();
/* 加上面两句试下 */Response.End();

Answer 2

另外我在最后还加上了这句话 File.Delete(path);尝试了1楼所説的方法，依然不可以。

Answer 3

这是文件下载吧？要不换一个试试:建立一个download.ashx
<%@ WebHandler Language="C#" Class="download" %>
using System;
using System.Web;
public class download : IHttpHandler {
 
    public void ProcessRequest (HttpContext context) {
        string url = HttpContext.Current.Server.UrlDecode(context.Request.QueryString["url"]);
        downloadfile(url);
    }    public bool IsReusable {
        get {
            return false;
        }
    }
    public void downloadfile(string s_fileName)
    {
      HttpContext.Current.Response.ContentType = "application/ms-download";
      string s_path = HttpContext.Current.Server.MapPath("~/") + s_fileName;
      System.IO.FileInfo file = new System.IO.FileInfo(s_path);
      HttpContext.Current.Response.Clear();
      HttpContext.Current.Response.AddHeader("Content-Type", "application/octet-stream");
      HttpContext.Current.Response.Charset = "utf-8";
      HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(file.Name, System.Text.Encoding.UTF8));
      HttpContext.Current.Response.AddHeader("Content-Length", file.Length.ToString());
      HttpContext.Current.Response.WriteFile(file.FullName);
      HttpContext.Current.Response.Flush();
      HttpContext.Current.Response.Clear();
      HttpContext.Current.Response.End();
    }
}
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在其它页面使用时：说明.txt为文件名<a href="download.ashx?url= <%=Server.UrlEncode("说明.txt")%>">下载 </a>