Question

任何一个指南都可以作为将图像存储到数据库的最佳方式吗？我正在使用Sql server 2008.目前我在数据库中存储文件路径，但是当我尝试获取它时，它不会被提取。

以下是保存图片的代码：

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.";
 }

获取图片的代码：

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

在你的情况下：

以下是您想要实现的目标的代码：

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

在将图像保存到磁盘之前调整大小的代码。它只保存数据库中的路径而不是数据库中的图像。如果我们在磁盘上的数据库和文件中保存路径，那么每当我们必须显示该图像时，我们可以节省CPU成本（试一试）。您可以使用它来保存项目的任何图像，只需提供上传器控件和图像路径即可。

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;
}

然后您可以通过获取图像路径来获取它即
image.url = //图像列值

Answer 3

 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();

在linq to sql中将数据存储在数据库中的最佳方法

3 个答案: