断点续传下载功能
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public static bool ResponseFile( System.Web.HttpRequest _Request,
System.Web.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;
int pack = 10240; //10K bytes
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=" + System.Web.HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );
br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;
byte[] buffer=new byte[pack];
for (int i = 0; i < maxCount; i++)
{
if (_Response.IsClientConnected)
{
buffer=br.ReadBytes(pack);
_Response.OutputStream.Write(buffer, 0, pack);
_Response.Flush();
buffer=new byte[pack];
}
else
{
i=maxCount;
}
}
}
catch(Exception myerror)
{
throw myerror;
}
finally
{
br.Close();
myFile.Close();
}
}
catch(Exception myerror)
{
throw myerror;
}
return true;
}
System.Web.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;
int pack = 10240; //10K bytes
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=" + System.Web.HttpUtility.UrlEncode(_fileName,System.Text.Encoding.UTF8) );
br.BaseStream.Seek(startBytes, SeekOrigin.Begin);
int maxCount = (int) Math.Floor((fileLength - startBytes) / pack) + 1;
byte[] buffer=new byte[pack];
for (int i = 0; i < maxCount; i++)
{
if (_Response.IsClientConnected)
{
buffer=br.ReadBytes(pack);
_Response.OutputStream.Write(buffer, 0, pack);
_Response.Flush();
buffer=new byte[pack];
}
else
{
i=maxCount;
}
}
}
catch(Exception myerror)
{
throw myerror;
}
finally
{
br.Close();
myFile.Close();
}
}
catch(Exception myerror)
{
throw myerror;
}
return true;
}
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