mvc 下載檔案

方式一：

/// <summary>

    /// 檔案下載類
    /// 調用1：DownLoadFile("/2003.xls", null); 
    /// 調用2：DownLoadFile("/2003.xls", ""); 
    /// 調用3：DownLoadFile("/2003.xls", "temp.xls"); 
    /// </summary>
    /// <param name="filePath">檔案路徑(格式：/upload/2003.xls)</param>
    /// <param name="filename">自訂檔案名稱(不想自訂檔案名稱請傳[ "" or null ] )</param>

public ActionResult DownFile(string filePath, string fileName)  

1.         {  
2.             filePath = Server.MapPath(System.Configuration.ConfigurationManager.AppSettings["AttachmentPath"] + filePath);  
3.             FileStream fs = new FileStream(filePath, FileMode.Open);  
4.             byte[] bytes = new byte[(int)fs.Length];   //以字元流的形式下載檔案
   
   
5.             fs.Read(bytes, 0, bytes.Length);  
6.             fs.Close();  
7.             Response.Charset = "UTF-8";  
8.             Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");  
9.             Response.ContentType = "application/octet-stream";  //通知瀏覽器下載檔案而不是開啟
   
   
10.   
11.             Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(fileName));  
12.             Response.BinaryWrite(bytes);  
13.             Response.Flush();  
14.             Response.End();  
15.             return new EmptyResult();  
16.   
17.         } 
    

方式二：

public FileStreamResult DownFile(string filePath, string fileName)
{
      string absoluFilePath = Server.MapPath(System.Configuration.ConfigurationManager.AppSettings["AttachmentPath"] +      filePath);
       return File(new FileStream(absoluFilePath, FileMode.Open), "application/octet-stream", Server.UrlEncode(fileName));
}

調用方式：

<a href="/Document/DownFile?filePath=@item.Value&fileName=@item.Key">下載</a>