ASP.NET文件下载函数(好用的东东)

在你的Page_Load中添加这样的代码:

 Page.Response.Clear();
 
bool success = ResponseFile(Page.Request, Page.Response, "目的文件名称"@"源文件路径"1024000);
 
if (!success)
     Response.Write(
"下载文件出错!");
Page.Response.End();

文件下载函数代码为:
public static bool ResponseFile(HttpRequest _Request,HttpResponse _Response,string _fileName,string _fullPath, long _speed)
    
{
        
try
        
{
            FileStream myFile 
= new FileStream(_fullPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            BinaryReader br 
= new BinaryReader(myFile);
            
try
            
{
                _Response.AddHeader(
"Accept-Ranges""bytes");
                _Response.Buffer 
= false;
                
long fileLength = myFile.Length;
                
long startBytes = 0;
     
                
double pack = 10240//10K bytes
                
//int sleep = 200;   //每秒5次   即5*10K bytes每秒
                int sleep = (int)Math.Floor(1000 * pack / _speed) + 1;
                
if (_Request.Headers["Range"!= null)
                
{
                    _Response.StatusCode 
= 206;
                    
string[] range = _Request.Headers["Range"].Split(new char[] {'=''-'});
                    startBytes 
= Convert.ToInt64(range[1]);
                }

                _Response.AddHeader(
"Content-Length", (fileLength - startBytes).ToString());
                
if (startBytes != 0)
                
{
                    
//Response.AddHeader("Content-Range", string.Format(" bytes {0}-{1}/{2}", startBytes, fileLength-1, fileLength));
                }

                _Response.AddHeader(
"Connection""Keep-Alive");
                _Response.ContentType 
= "application/octet-stream";
                _Response.AddHeader(
"Content-Disposition","attachment;filename=" + HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );
             
                br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
                
int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;

                
for (int i = 0; i < maxCount; i++)
                
{
                    
if (_Response.IsClientConnected)
                    
{
                        _Response.BinaryWrite(br.ReadBytes(
int.Parse(pack.ToString())));
                        Thread.Sleep(sleep);
                    }

                    
else
                    
{
                        i
=maxCount; 
                    }

                }

            }

            
catch
            
{
             
return false;
            }

            
finally
            
{
                br.Close();

                myFile.Close();
            }

        }

        
catch
        
{
            
return false;
        }

        
return true;
    }

这样就实现了文件下载时,不管是什么格式的文件,都能够弹出打开/保存窗口.
posted @ 2007-03-12 15:43  Leepy  阅读(22243)  评论(41编辑  收藏  举报