FileHandler http://www.cnblogs.com/vipsoft/p/3627709.html
UpdatePanel无法导出下载文件: http://www.cnblogs.com/vipsoft/p/3298299.html
//相对路径下载。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;
} //物理路径下载。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(); //解决 ThreadAbortException 异常问题 }
}
return result;
}
两种方法的结合
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;
}
根据一些业务逻辑返回相应的状态字符串，如果出现异常做返回“error”，我预期它返回“状态1”，结果测试时发现
AJAX回调的结果是“状态1error”，它居然抛出异常了！
google后得知：Response.End 方法终止页的执行，并将此执行切换到应用程序的事件管线中的
Application_EndRequest 事件,同时抛出ThreadAbortException 异常，异常信息为“正在中止线程”。另外
Response.Redirect、Server.Transfer方法也会出现这个问题，因为它们内部调用了Response.End 方法。
它给出的解决方案是使用HttpContext.Current.ApplicationInstance.CompleteRequest 方法以跳过
Application_EndRequest 事件的代码执行，但是我试了后发现虽然不抛出异常了，但是页面后面的代码依然会执行，
达不到Response.End的效果。
Response.End导致“正在中止线程”异常的问题，来源：
http://www.cnblogs.com/jintianhu/archive/2011/02/16/1952833.html