dbからの画像をC＃/ asp.netに読み込み

Question

私はコードを別の方法で再加工しました。しかし、私のリターンはまだ盗聴されているようですか、それともファイルを正しく変換していませんか？

C＃ページ読み込み時に呼び出されるメソッド。

 private void LoadDisplayPhoto() 
    { 
     var query = (from q in CurrentContext.DisplayPhotos 
        where q.UserID == CurrentUser.UserId 
        select q.Name).FirstOrDefault(); 
     if (query != null) 
     { 
      img_adm.ImageUrl = ("~/HandlerFiles/Display.ashx?ImageID=" + CurrentUser.UserId); 
     } 
     else 
     { 
      img_adm.ImageUrl = ("~/Content/img/NoProfilePic.jpg"); 
     } 
    } 

ハンドルファイル

public void ProcessRequest (HttpContext context) 
{ 
    byte[] buffer = null; 
    string querySqlStr = ""; 
    //SQL commands. 
    if (context.Request.QueryString["ImageID"] != null) 
    { 
     querySqlStr="select * from DisplayPhotos where PhotoId="+context.Request.QueryString["ImageID"]; 
    } 
    else 
    { 
     querySqlStr="select * from DisplayPhotos"; 
    } 
    //SQL 
    SqlConnection connection = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["WebTest"].ToString()); 
    SqlCommand command = new SqlCommand(querySqlStr, connection); 
    SqlDataReader reader = null; 
    try 
    { 
     connection.Open(); 
     reader = command.ExecuteReader(); 
     while (reader.Read()) 
     { 
      //The ID that was requested. 
      int id = Convert.ToInt32(context.Request.QueryString["ImageID"]); 
      //Gets extenion format. 
      var extension = (from q in CurrentContext.DisplayPhotos 
          where q.UserID == id 
          select q.ContentType).FirstOrDefault(); 

      string name = reader["Name"].ToString(); 
      int endIndex = name.LastIndexOf('.'); 
      buffer = (byte[])reader["Data"]; 
      context.Response.Clear(); 
      context.Response.ContentType = "image/" + extension; 
      context.Response.BinaryWrite(buffer); 
      context.Response.Flush(); 
      context.Response.Close(); 
     } 
     reader.Close(); 

    } 
    finally 
    { 
     connection.Close(); 
    } 
} 

名=ファイル名 データは変換されたデータを=。

ファイルアップロードのための私の方法：

 protected void LinkButton4_Click(object sender, EventArgs e) 
    { 
     div_editProfile.Visible = true; 
     lbl_imgError.Visible = false; 
     if (up_ProImg.HasFile) 
     { 
      int fileLength = up_ProImg.PostedFile.ContentLength; 
      string fileName = up_ProImg.PostedFile.FileName; 
      string fileType = up_ProImg.PostedFile.ContentType; 
      byte[] img = new byte[fileLength]; 

      var que = from y in CurrentContext.DisplayPhotos 
         where y.Name == fileName 
         select y; 
      if (que.Count() > 0) 
      { 
       lbl_imgError.Visible = true; 
       lbl_imgError.Text = ""; 
      } 
      else 
      { 
       up_ProImg.PostedFile.InputStream.Read(img, 0, fileLength); 
       try 
       { 
        using (DataContextDataContext udp = new DataContextDataContext()) 
        { 
         DisplayPhoto DisP = new DisplayPhoto(); 
         DisP.Name = fileName; 
         DisP.ContentType = fileType; 
         DisP.DateLastModified = DateTime.Now; 
         DisP.PhotoId = CurrentUser.UserId; 
         DisP.Data = img; 
         DisP.IsPhoto = true; 
         DisP.IsActive = true; 
         DisP.UserID = CurrentUser.UserId; 
         udp.DisplayPhotos.InsertOnSubmit(DisP); 
         udp.SubmitChanges(); 
        } 
       } 
       finally 
       { 
        var check = from q in CurrentContext.DisplayPhotos 
           where q.Name == fileName 
           select q; 

        if (check.Count() > 0) 
        { 
         lbl_imgError.Visible = true; 
         lbl_imgError.Text = "Image uploaded."; 
        } 
        else 
        { 
         lbl_imgError.Visible = true; 
         lbl_imgError.Text = "Failed to connect to database."; 
        } 
       } 
      } 
     } 
     else 
     { 
      lbl_imgError.Visible = true; 
      lbl_imgError.Text = "No image to upload."; 
     } 
    } 

Answer 1

は、ToListメソッドメソッドを使用してみてください。

var que = from r in CurrentContext.Photos 
      select new 
      { 
       PhotoId = r.PhotoId, 
       Name = r.Name, 
       PhotoLink = r.SmallThumbnail 
      }.ToList() 


<asp:ImageButton ID="imgPhoto" runat="server" Width="80px" Height="80px" OnClick="imgPhoto_Click" ImageUrl="[PhotoLink]"CssClass="PhotoHandle"/> 

編集[PhotoLink]適切なデータ属性ASPコードで