Asp.net實(shí)現(xiàn)MVC處理文件的上傳下載功能實(shí)例教程

form action="/" method="post" enctype="multipart/form-data"> 
 input type="file" name="FileUpload1" />br /> 
 input type="submit" name="Submit" id="Submit" value="Upload" /> 
/form> 

% 
 using (Html.BeginForm("", "home", FormMethod.Post, new {enctype="multipart/form-data"}))  
  {%>  
   input type="file" name="FileUpload1" />br /> 
   input type="submit" name="Submit" id="Submit" value="Upload" /> 
% }%> 

public static bool HasFile(this HttpPostedFileBase file) 
{ 
 return (file != null  file.ContentLength > 0) ? true : false; 
}

public class HomeController : Controller 
{ 
 public ActionResult Index() 
 { 
  foreach (string upload in Request.Files) 
  { 
   if (!Request.Files[upload].HasFile()) continue; 
   string path = AppDomain.CurrentDomain.BaseDirectory + "uploads/"; 
   string filename = Path.GetFileName(Request.Files[upload].FileName); 
   Request.Files[upload].SaveAs(Path.Combine(path, filename)); 
  } 
  return View(); 
 } 
}

% 
 using (Html.BeginForm("", "home", FormMethod.Post, new {enctype="multipart/form-data"}))  
  {%>  
   input type="file" name="FileUpload1" />br /> 
   input type="file" name="FileUpload2" />br /> 
   input type="file" name="FileUpload3" />br /> 
   input type="file" name="FileUpload4" />br /> 
   input type="file" name="FileUpload5" />br /> 
   input type="submit" name="Submit" id="Submit" value="Upload" /> 
% }%>  

CREATE TABLE [dbo].[FileStore]( 
[ID] [int] IDENTITY(1,1) NOT NULL, 
[FileContent] [image] NOT NULL, 
[MimeType] [nvarchar](50) NOT NULL, 
[FileName] [nvarchar](50) NOT NULL 
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY] 

public ActionResult Index() 
{ 
 foreach (string upload in Request.Files) 
 { 
  if (!Request.Files[upload].HasFile()) continue; 
  string mimeType = Request.Files[upload].ContentType; 
  Stream fileStream = Request.Files[upload].InputStream; 
  string fileName = Path.GetFileName(Request.Files[upload].FileName); 
  int fileLength = Request.Files[upload].ContentLength; 
  byte[] fileData = new byte[fileLength]; 
  fileStream.Read(fileData, 0, fileLength); 
  const string connect = @"Server=.\SQLExpress;Database=FileTest;Trusted_Connection=True;"; 
  using (var conn = new SqlConnection(connect)) 
  { 
   var qry = "INSERT INTO FileStore (FileContent, MimeType, FileName) VALUES (@FileContent, @MimeType, @FileName)"; 
   var cmd = new SqlCommand(qry, conn); 
   cmd.Parameters.AddWithValue("@FileContent", fileData); 
   cmd.Parameters.AddWithValue("@MimeType", mimeType); 
   cmd.Parameters.AddWithValue("@FileName", fileName); 
   conn.Open(); 
   cmd.ExecuteNonQuery(); 
  } 
 } 
 return View(); 
}

public FileContentResult GetFile(int id) 
{ 
 SqlDataReader rdr; byte[] fileContent = null;  
 string mimeType = "";string fileName = ""; 
 const string connect = @"Server=.\SQLExpress;Database=FileTest;Trusted_Connection=True;"; 
 using (var conn = new SqlConnection(connect)) 
 { 
  var qry = "SELECT FileContent, MimeType, FileName FROM FileStore WHERE ID = @ID"; 
  var cmd = new SqlCommand(qry, conn); 
  cmd.Parameters.AddWithValue("@ID", id); 
  conn.Open(); 
  rdr = cmd.ExecuteReader(); 
  if (rdr.HasRows) 
  { 
   rdr.Read(); 
   fileContent = (byte[])rdr["FileContent"]; 
   mimeType = rdr["MimeType"].ToString(); 
   fileName = rdr["FileName"].ToString(); 
  } 
 } 
 return File(fileContent, mimeType, fileName); 
}  

a href="/GetFile/1">Click to get file/a> 

img src="/GetFile/1" alt="My Image" /> 

public FilePathResult GetFileFromDisk() 
{ 
 string path = AppDomain.CurrentDomain.BaseDirectory + "uploads/"; 
 string fileName = "test.txt"; 
 return File(path + fileName, "text/plain", "test.txt"); 
}  

a href="/GetFileFromDisk">Click to get file/a> 

public FileStreamResult StreamFileFromDisk() 
{ 
 string path = AppDomain.CurrentDomain.BaseDirectory + "uploads/"; 
 string fileName = "test.txt"; 
 return File(new FileStream(path + fileName, FileMode.Open), "text/plain", fileName); 
}