如何将图像与C＃上的文本框和组合框一起从SQL Server绑定到图片框？

Question

So I have a table called Bicycle inside BikeStore database on sql server, consists of the following columns: BID, BName, Description, BType, Brand, Origin, Price, Stock, BImage

Successfully bind all textboxes and one combo box with my data from sql server just by clicking cells on datagridview. Below is the code:

private void dg1_CellClick(object sender, DataGridViewCellEventArgs e)
{
        bidTxt.Text = dg1.SelectedRows[0].Cells[0].Value.ToString();
        bnameTxt.Text = dg1.SelectedRows[0].Cells[1].Value.ToString();
        bdescrichTxt.Text = dg1.SelectedRows[0].Cells[2].Value.ToString();
        typeCB.Text = dg1.SelectedRows[0].Cells[3].Value.ToString();
        brandTxt.Text = dg1.SelectedRows[0].Cells[4].Value.ToString();
        originTxt.Text = dg1.SelectedRows[0].Cells[5].Value.ToString();
        priceTxt.Text = dg1.SelectedRows[0].Cells[6].Value.ToString();
        stockTxt.Text = dg1.SelectedRows[0].Cells[7].Value.ToString();

But it still generates an error everytime I tried to load the image too. Here's the code:

        sqlconn.Open();

        SqlCommand cmd = new SqlCommand("SELECT BImage FROM Bicycle WHERE BID = " + dg1.SelectedRows[0].Cells[0].Value + "", sqlconn);
        da.SelectCommand = cmd;
        DataSet ds = new DataSet();
        byte[] mydata = new byte[0];
        da.Fill(ds, "Bicycle");
        DataRow myrow;
        myrow = ds.Tables["Bicycle"].Rows[8];
        mydata = (byte[])myrow["BImage"];
        MemoryStream stream = new MemoryStream(mydata);
        BikePic.Image = Image.FromStream(stream);

        sqlconn.Close();
}

What did I do wrong?

I'm new at this.

Answer 1

If it just about only retrieving the BLOB on that query then you could do something more simple :

// SqlConnection creation and opening omitted
using(SqlCommand cmd = new SqlCommand("SELECT BImage FROM Bicycle WHERE BID = " + dg1.SelectedRows[0].Cells[0].Value + "", sqlconn))
{
  byte[] mydata = (byte[])cmd.ExecuteScalar();
  MemoryStream stream = new MemoryStream(mydata);
  BikePic.Image = Image.FromStream(stream);
}

Also you might want to dispose of stream after creating the Image control but I'm not completely sure.

Answer 2

Problem solved! Add single quotation mark on the SqlCommand line between the blockquote as it'll search up the ID you looking for, like this:

SqlCommand cmd = new SqlCommand("SELECT BImage FROM Bicycle WHERE BID = '" + dg1.SelectedRows[0].Cells[0].Value + "'", sqlconn);

Below is the code before modified . See the difference?

SqlCommand cmd = new SqlCommand("SELECT BImage FROM Bicycle WHERE BID = " + dg1.SelectedRows[0].Cells[0].Value + "", sqlconn);

Haha silly me. Thanks anyway guys!