C file download instance code (for each browser)

1. cs code

public void DownFile(string filePath ,string fileName )
{
 // filePath  File path   For example: /File/ Record .xlsx 
 // fileName  File name   For example: Records .xlsx  (Suffix oh) 
Encoding encoding; //  Declaration code 
string outputFileName; //  Output name 
Debug.Assert(HttpContext.ApplicationInstance.Request.UserAgent != null, "HttpContext.ApplicationInstance.Request.UserAgent != null");
string browser = HttpContext.ApplicationInstance.Request.UserAgent.ToUpper();
//  Microsoft's browser and ie Filter 
if (browser.Contains("MS") && browser.Contains("IE"))
{
outputFileName = HttpUtility.UrlEncode(filePath);
encoding = Encoding.Default;
}
// Firefox 
else if (browser.Contains("FIREFOX"))
{
outputFileName = fileName;
encoding = Encoding.GetEncoding("GB2312");
}
else
{
outputFileName = HttpUtility.UrlEncode(fileName);
encoding = Encoding.Default;
}
string absoluFilePath = Server.MapPath(filePath); // Get the upload file path 
FileStream fs = new FileStream(absoluFilePath, FileMode.Open);
byte[] bytes = new byte[(int)fs.Length];
fs.Read(bytes, 0, bytes.Length);
fs.Close(); // Close the flow and free the resource 
HttpContext.ApplicationInstance.Response.Clear();
HttpContext.ApplicationInstance.Response.Buffer = true;
HttpContext.ApplicationInstance.Response.ContentEncoding = encoding;
HttpContext.ApplicationInstance.Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}", string.IsNullOrEmpty(outputFileName) ? DateTime.Now.ToString("yyyyMMddHHmmssfff") : outputFileName));
Response.BinaryWrite(bytes);
Response.Flush();
HttpContext.ApplicationInstance.Response.End();
}

2. html code

It is good to write an a tag on the front-end HTML: such as <a href='DownFile' target='_blank'>文件下载</a>