使用ASP.NET中的FileUpload更新SQL中的图像

Question

I'm trying to store profile images for users in SQL. My problem is that nothing is saved in the database table. The column where I want to save the image has image as datatype.

Here is my code:

UPDATE: Code updated and working. The problem was the parameters used in the query. Many thanks to SeM and Crowcoder!

protected void ButtonPic_Click(object sender, EventArgs e)
    {
        string filePath = FileUpload1.PostedFile.FileName;
        string filename = Path.GetFileName(filePath);
        string ext = Path.GetExtension(filename);
        string contenttype = string.Empty;
        string username = User.Identity.Name; // Gets the current username

        switch (ext)
        {
            case ".jpg":
                contenttype = "image/jpg";
                break;
            case ".png":
                contenttype = "image/png";
                break;
        }

        if (contenttype != string.Empty)
        {
            Stream fs = FileUpload1.PostedFile.InputStream;
            BinaryReader br = new BinaryReader(fs);
            byte[] bytes = br.ReadBytes((int)fs.Length + 1);

            string base64String = Convert.ToBase64String(bytes, 0,   bytes.Length);
            Image1.ImageUrl = "data:image/png;base64," + base64String;

            string constr = ConfigurationManager.ConnectionStrings["LoginDBConnectionString"].ConnectionString;
            string strQuery = "UPDATE Users SET Image=@data WHERE Username=@user";

            try
            {
                using (SqlConnection con = new SqlConnection(constr))
                {
                    con.Open();
                    using (SqlCommand cmd = con.CreateCommand())
                    {
                        cmd.CommandType = CommandType.Text;
                        cmd.Parameters.Add(new SqlParameter("@data", bytes)); 
                        cmd.Parameters.Add(new SqlParameter("@user", username));
                        cmd.CommandText = strQuery;
                        cmd.ExecuteNonQuery();
                    }
                }
            }
            catch (Exception ex)
            {
            }
        }
        else
        {
            lblMessage.ForeColor = System.Drawing.Color.Red;
            lblMessage.Text = "Filformat stöds inte." +
              " Endast jpg/png är tillåtet";
        }
    }

The conversion to a byte array is working but I can't figure out where the problem could be.

Answer 1

Remove the using(SqlDataAdapter sda = new SqlDataAdapter()){} , then change that part like this:

try
{
    using (SqlConnection con = new SqlConnection(constr))
    {
        con.Open();
        using (SqlCommand cmd = con.CreateCommand())
        {
            cmd.CommandType = CommandType.Text;
            cmd.Parameters.Add(new SqlParameter("@data", bytes));
            cmd.Parameters.Add(new SqlParameter("@user", LoginName1.ToString()));
            cmd.CommandText = strQuery;
            cmd.ExecuteNonQuery();
        }
    }
}
catch(Exception ex)
{
    //Handle your exception   
}

catch your exception and check problems from database or query string.

Answer 2

Use try-catch block to know the exception you get.

Remove the sql data adapter since you didn't use it.

Try referring this link .

Answer 3

exec sp_executesql N'UPDATE Users SET Image=@data WHERE Username=@user',N'@data image,@user nvarchar(35)',@data=default,@user=N'System.Web.UI.WebControls.LoginName' - Found this in profiler

Assuming LoginName1 is a TextBox , you must access the Text property to get the value. If you ToString() a control you get what you are seeing, the name of the control: System.Web.UI.WebControls.LoginName

You must do:

cmd.Parameters.Add(new SqlParameter("@user", LoginName1.Text));

UPDATE:

I should have noticed that LoginName1 is not a TextBox. You may have to access the User property, I don't see a property on LoginName control to get the value but maybe I'm just missing it.