asp.net 文件下载功能函数代码整理

时间:2022-06-06 16:37:15

代码如下:


public void FileDownLoadDel(string fullFilename) 

System.IO.Stream iStream = null; 
// Buffer to read 10K bytes in chunk: 
byte[] buffer = new Byte[10000]; 
// Length of the file: 
int length; 
// Total bytes to read: 
long dataToRead; 
// Identify the file to download including its path. 
string filepath = fullFilename; 
filepath = Server.MapPath(filepath); 
// Identify the file name. 
string filename = System.IO.Path.GetFileName(filepath); 

try 

// Open the file. 
iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open, 
System.IO.FileAccess.Read, System.IO.FileShare.Read); 

// Total bytes to read: 
dataToRead = iStream.Length; 
Response.ContentType = "application/octet-stream"; 
Response.AddHeader("Content-Disposition", "attachment; filename=" + filename); 
// Read the bytes. 
while (dataToRead > 0) 

// Verify that the client is connected. 
if (Response.IsClientConnected) 

// Read the data in buffer. 
length = iStream.Read(buffer, 0, 10000); 
// Write the data to the current output stream. 
Response.OutputStream.Write(buffer, 0, length); 
// Flush the data to the HTML output. 
Response.Flush(); 
buffer = new Byte[10000]; 
dataToRead = dataToRead - length; 

else 

//prevent infinite loop if user disconnects 
dataToRead = -1; 
Response.Clear(); 


Response.End(); //没有这句会将该页面刷新后的内容追加写入文件中。 

catch (Exception ex) 

// Trap the error, if any. 
//Response.Write("Error : " + ex.Message); 
//base.WriteLog("资料", "下载资料:" + ex.Message + "!", LogType.Error, this.GetType().ToString()); 

finally 

if (iStream != null) 

//Close the file. 
iStream.Close(); 

File.Delete(fullFilename);