.net文件下载方法汇总
转载自：http://blog.sina.com.cn/s/blog_680942070101ahsq.html
//TransmitFile实现下载
protected void Button1_Click1(object sender, EventArgs e)
{
string strFileName = "三部闲置设备管理系统操作手册IEMS.ppt";
Response.ContentType = "application/x-zip-compressed";
//Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
string filename = BLL.Config.PART_EM_UPLOAD_DOC + strFileName;
//BLL.Config.PART_EM_UPLOAD_DOC 为路径 ("D:/EMUploadDoc/")
Response.AddHeader("Content-Disposition", "attachment;filename=" +Server.UrlPathEncode(strFileName));
//Server.UrlPathEncode()解决文件名的乱码问题.
Response.TransmitFile(filename);
} //WriteFile实现下载
protected void Button2_Click(object sender, EventArgs e)
{
string fileName = "asd.txt";//客户端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
FileInfo fileInfo = new FileInfo(filePath);
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);
Response.AddHeader("Content-Length", fileInfo.Length.ToString());
Response.AddHeader("Content-Transfer-Encoding", "binary");
Response.ContentType = "application/octet-stream";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");
Response.WriteFile(fileInfo.FullName);
Response.Flush();
Response.End();
}
//WriteFile分块下载
protected void Button3_Click(object sender, EventArgs e)
{
string fileName = "aaa.txt";//客户端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);
if (fileInfo.Exists == true)
{
const long ChunkSize = 102400;//100K 每次读取文件，只读取100Ｋ，这样可以缓解服务器的压力
byte[] buffer = new byte[ChunkSize];
Response.Clear();
System.IO.FileStream iStream = System.IO.File.OpenRead(filePath);
long dataLengthToRead = iStream.Length;//获取下载的文件总大小
Response.ContentType = "application/octet-stream";
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName));
while (dataLengthToRead > 0 && Response.IsClientConnected)
{
int lengthRead = iStream.Read(buffer, 0, Convert.ToInt32(ChunkSize));//读取的大小
Response.OutputStream.Write(buffer, 0, lengthRead);
Response.Flush();
dataLengthToRead = dataLengthToRead - lengthRead;
}
Response.Close();
}
}
//流方式下载
protected void Button4_Click(object sender, EventArgs e)
{
string fileName = "aaa.txt";//客户端保存的文件名
string filePath = Server.MapPath("DownLoad/aaa.txt");//路径
//以字符流的形式下载文件
FileStream fs = new FileStream(filePath, FileMode.Open);
byte[] bytes = new byte[(int)fs.Length];
fs.Read(bytes, 0, bytes.Length);
fs.Close();
Response.ContentType = "application/octet-stream";
//通知浏览器下载文件而不是打开
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8));
Response.BinaryWrite(bytes);
Response.Flush();
Response.End();
}
C#:
///
/// 文件下载
///
///
private void FileDownload(string FullFileName)
{
FileInfo DownloadFile = new FileInfo(FullFileName);
Response.Clear();
Response.ClearHeaders();
Response.Buffer=false;
Response.ContentType= "application/octet-stream ";
Response.AppendHeader( "Content-Disposition ", "attachment;filename= " +HttpUtility.UrlEncode(DownloadFile.FullName,System.Text.Encoding.UTF8));
Response.AppendHeader( "Content-Length ",DownloadFile.Length.ToString());
Response.WriteFile(DownloadFile.FullName);
Response.Flush();
Response.End();
}
文件读写
public Stream GetFileStream(string filename)
{ //文件地址
Uri fileUri = new Uri(filename, UriKind.Relative);
//保存
StreamResourceInfo info = new StreamResourceInfo(this.stream, null);
if (this.stream is System.IO.FileStream)
{
this.stream.Seek(0, SeekOrigin.Begin);
}
StreamResourceInfo stream = System.Windows.Application.GetResourceStream(info, fileUri);
if (stream != null)
{
return stream.Stream;
}
return null;
}
public IEnumerable GetFileNamesInZip()
{
BinaryReader reader = new BinaryReader(stream);
stream.Seek(0, SeekOrigin.Begin);
string name = null;
List names = new List();
while (ParseFileHeader(reader, out name))
{
names.Add(name);
}
return names;
}
private static bool ParseFileHeader(BinaryReader reader, out string filename)
{
filename = null;
if (reader.BaseStream.Position < reader.BaseStream.Length)
{
filename = null;
if (reader.BaseStream.Position < reader.BaseStream.Length)
{
reader.BaseStream.Seek(2, SeekOrigin.Current);
short genPurposeFlag = reader.ReadInt16();
if (((((int)genPurposeFlag) & 0x08) != 0))
return false;
reader.BaseStream.Seek(10, SeekOrigin.Current);
int compressedSize = reader.ReadInt32();
int unCompressedSize = reader.ReadInt32();
short fileNameLenght = reader.ReadInt16();
short extraFieldLenght = reader.ReadInt16();
filename = new string(reader.ReadChars(fileNameLenght));
if (string.IsNullOrEmpty(filename))
return false;
reader.BaseStream.Seek(extraFieldLenght + compressedSize, SeekOrigin.Current); if (unCompressedSize == 0) return ParseFileHeader(reader, out filename);
else
return true;
}
}
return false;
}
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