C# 指定物理目錄下載文件，Response.End導致“正在中止線程”異常的問題

FileHandler http://www.cnblogs.com/vipsoft/p/3627709.html

UpdatePanel無法導出下載文件: http://www.cnblogs.com/vipsoft/p/3298299.html

//相對路徑下載。path: ~/DownLoad/
//<add key="DownLoadPath" value="~/DownLoad/"/>
public static bool DownLoadFile(string path, string fileName)
{
    bool result = false; 
    try
    {
        string filePath = HttpContext.Current.Server.MapPath(path + fileName);
        if (File.Exists(filePath))
        { 
            FileInfo fileInfo = new FileInfo(filePath);
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.ClearHeaders();
            HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
            HttpContext.Current.Response.AddHeader("Content-Length", fileInfo.Length.ToString());
            HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "binary");
            HttpContext.Current.Response.ContentType = "application/octet-stream";
            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
            HttpContext.Current.Response.WriteFile(fileInfo.FullName);
            HttpContext.Current.Response.Flush(); 
            HttpContext.Current.Response.End();
            result = true;
        }
    }
    catch
    { 
    } 
    return result;
}
 

//物理路徑下載。path: D:\DownLoad\
//<add key="DownLoadPath" value="D:\DownLoad\"/>
public static bool DownLoadFile(string path, string fileName)
{
    bool result = false;
    string filePath = path + fileName;
    if (File.Exists(filePath))
    { 
        try
        {
            //string filePath = HttpContext.Current.Server.MapPath(path + fileName);
            
            FileInfo fileInfo = new FileInfo(filePath);
            HttpContext.Current.Response.Clear();
            HttpContext.Current.Response.ClearContent();
            HttpContext.Current.Response.ClearHeaders();
            HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
            HttpContext.Current.Response.AddHeader("Content-Length", fileInfo.Length.ToString());
            HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "binary");
            HttpContext.Current.Response.ContentType = "application/octet-stream";
            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
            HttpContext.Current.Response.WriteFile(fileInfo.FullName);
            HttpContext.Current.Response.Flush(); 
            result = true; 
        }
        catch (Exception e)
        {
        }
        finally
        {
            HttpContext.Current.Response.End();    //解決 ThreadAbortException 異常問題

        }
    } 
    return result;
}

 兩種方法的結合

 public static bool DownLoadFile(string path, string fileName)
        {
            bool result = false;
            string filePath = path + fileName;
            if (File.Exists(filePath))
            {
                result = true;
            }
            else
            {
                try
                { 
                    filePath = HttpContext.Current.Server.MapPath(path + fileName);
                    if (File.Exists(filePath))
                    {
                        result = true;
                    }
                }
                catch 
                {
                    result = false;
                }
            }
            if (result)
            { 
                try
                {
                    //string filePath = HttpContext.Current.Server.MapPath(path + fileName); 
                    FileInfo fileInfo = new FileInfo(filePath);
                    HttpContext.Current.Response.Clear();
                    HttpContext.Current.Response.ClearContent();
                    HttpContext.Current.Response.ClearHeaders();
                    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
                    HttpContext.Current.Response.AddHeader("Content-Length", fileInfo.Length.ToString());
                    HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "binary");
                    HttpContext.Current.Response.ContentType = "application/octet-stream";
                    HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");
                    HttpContext.Current.Response.WriteFile(fileInfo.FullName);
                    HttpContext.Current.Response.Flush();  
                }
                catch (Exception e)
                {
                }
                finally
                {
                    HttpContext.Current.Response.End();
                }
            }
            return result;
        }

 

根據一些業務邏輯返回相應的狀態字符串，如果出現異常做返回“error”，我預期它返回“狀態1”，結果測試時發現
AJAX回調的結果是“狀態1error”，它居然拋出異常了！
google后得知：Response.End 方法終止頁的執行，並將此執行切換到應用程序的事件管線中的
Application_EndRequest 事件,同時拋出ThreadAbortException 異常，異常信息為“正在中止線程”。另外
Response.Redirect、Server.Transfer方法也會出現這個問題，因為它們內部調用了Response.End 方法。
它給出的解決方案是使用HttpContext.Current.ApplicationInstance.CompleteRequest 方法以跳過
Application_EndRequest 事件的代碼執行，但是我試了后發現雖然不拋出異常了，但是頁面后面的代碼依然會執行，
達不到Response.End的效果。

Response.End導致“正在中止線程”異常的問題，來源：

http://www.cnblogs.com/jintianhu/archive/2011/02/16/1952833.html