在LINQ to sql中存儲數據庫圖像的最佳方式

Question

任何一個指南都可以將圖像存儲到數據庫中嗎？我正在使用Sql server 2008.目前我正在數據庫中存儲文件路徑，但是當我試圖獲取它時，它不會被抓取。

下面是代碼來保存圖像：

string Extention = System.IO.Path.GetExtension(fuBanner.FileName); 
if (Extention == ".jpg" || Extention == ".jpeg" || Extention == ".bmp" || Extention == ".PNG") 
{ 
    result.Banner_SignUp_Page = System.IO.Path.GetExtension(fuBanner.FileName); 
    db.SubmitChanges(); 
    lblMsg.Visible = true; 
    Response.Redirect("ListOfEvent.aspx"); 
    //lblMsg.Text = "Records updated successfully."; 
} 

和代碼獲取圖像：

var result1 = from a in db.EMR_INVITATIONs 
    join b in db.EMR_EVENTs on a.EventID equals b.EventID 
    where b.EventID == (int)Session["eventid"] 
     select new 
       { 
        Banner = b.Banner_SignUp_Page, 
        Title = b.Title 
       }; 

Answer 1

你的情況：

下面是可能的代碼，你想達到什麼：

protected void btnUpload_Click(object sender, EventArgs e) 
{  
    if (fuFileUploader.HasFile && fuFileUploader.PostedFile.ContentLength > 0) 
    { 
     string path_file_name = fuFileUploader.PostedFile.FileName; 
     string ext = Path.GetExtension(path_file_name).Replace(".", ""); 
     string file_name = Path.GetFileNameWithoutExtension(path_file_name); 
     string file_title = txtFileTitle.Text.Trim(); 
     HelperDataClassesDataContext db = new HelperDataClassesDataContext(); 

     try 
     { 
      byte[] file_byte = fuFileUploader.FileBytes; 
      Linq.Binary file_binary = new Linq.Binary(file_byte); 

      ControlDocument cd = new ControlDocument 
      { 
       guid = Guid.NewGuid(), 
       file_ext = ext, 
       file_nm = file_name.Trim(), 
       file_title=file_title, 
       file_bin = file_binary, 
       is_active = true, 
       upload_page_type = rblLocation.SelectedValue, 
       upload_dt = DateTime.Now, 
       upload_by = UtilUniverse.Common.CurrentUserLogin.Trim() 
      }; 

      db.ControlDocuments.InsertOnSubmit(cd); 
     } 
     finally 
     { 

      db.SubmitChanges(); 
     } 
    } 

} 

Answer 2

InstituteRegistration insti = new InstituteRegistration(); 
if (FileUploadInstituteImage.PostedFile.ContentLength != 0) 
     { 
      string extension =   System.IO.Path.GetExtension(FileUploadInstituteImage.FileName); 
      if (extention.ToLower() == ".jpg" || extention.ToLower() == ".jpeg" || extention.ToLower() == ".gif" || extention.ToLower() == ".png" || extention.ToLower() == ".bmp" || extention.ToLower() == ".tif" || extention.ToLower() == ".tiff") 
      { 
       Stream fsInstitute = FileUploadInstituteImage.PostedFile.InputStream; 
       BinaryReader brInsti = new BinaryReader(fsInstitute); 
       Byte[] bytesInstitute = brInsti.ReadBytes((Int32)fsInstitute.Length); 
       insti.InstituteImage = bytesInstitute; 
      } 
      else 
      { 
       lblMsg.Text = "Invalid File."; 
       return; 
      } 
     } 

db.InstituteRegistrations.InsertOnSubmit(insti); 
db.SubmitChanges(); 

Answer 3

將圖像保存到磁盤之前調整大小的代碼。它在數據庫中保存路徑而不是數據庫中的映像。如果我們將數據庫和文件的路徑保存在磁盤上，那麼當我們必須顯示該圖像時（每次嘗試），我們都可以節省CPU成本（）。您可以使用它來保存項目的任何圖像，只需提供上傳控件和圖像路徑即可。

public static bool SaveImage(HttpPostedFile imageUpload, string imagePath, out string error) 
{ 
    error = ""; 
    string extension = Path.GetExtension(imageUpload.FileName); 
    if (extension.ToLower() == ".jpg" || extension.ToLower() == ".jpeg" || extension.ToLower() == ".png") 
    { 
     try 
     { 
      System.Drawing.Bitmap objImage = new System.Drawing.Bitmap(imageUpload.InputStream); 
      System.Drawing.Bitmap outImage = new Bitmap(170, 200); 
      System.Drawing.Graphics outGraphics = Graphics.FromImage(outImage); 
      SolidBrush sb = new SolidBrush(System.Drawing.Color.White); 
      outGraphics.FillRectangle(sb, 0, 0, 170, 200); 
      outGraphics.DrawImage(objImage, 0, 0, 170, 200); 
      sb.Dispose(); 
      outGraphics.Dispose(); 
      objImage.Dispose(); 
      outImage.Save(System.Web.HttpContext.Current.Server.MapPath(imagePath)); 
      return true; 
     } 
     catch (Exception e) 
     { 
      error = "Failed to save Image. Error: " + e.Message; 
     } 
    } 
    else 
    { 
     error = "Invalid image foramt."; 
    } 
    return false; 
} 

然後你可以簡單地通過獲取圖像路徑來獲取它。
即
image.url = //圖像列值