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我正在尝试开发一个 CBIR 应用程序，因此我正在获取输入图像，在三个不同的变量中计算其 RGB 值并修改这些值，然后将它们存储在三个变量中：r1, g1, b1.

然后我试图将这些值传递给数据库，以便我可以通过使用比较运算符比较它们来检索图像，但是我无法获取任何数据，尽管我认为我以正确的方式使用参数。

这是我的代码：

double r1, r2, g1, g2, b1, b2;
r1 = aveR -(.1 * aveR);
r2 = aveR +(.1 * aveR);
g1 = aveG -(.1 * aveG);
g2 = aveG +(.1 * aveG);
b1 = aveB -(.1 * aveB);
b2 = aveB +(.1 * aveB);

cn = new SqlConnection(@"Data Source=HOME;Initial Catalog=test_image;Integrated Security=True");
cmd = new SqlCommand("select path from image where red BETWEEN @r1 AND   @r2 AND green BETWEEN @g1 AND @g2 AND blue BETWEEN @b1 AND @b2" , cn);
cmd.Parameters.AddWithValue("@r1", r1);
cmd.Parameters.AddWithValue("@r2", r2);
cmd.Parameters.AddWithValue("@g1", g1);
cmd.Parameters.AddWithValue("@g2", g2);
cmd.Parameters.AddWithValue("@b1", b1);
cmd.Parameters.AddWithValue("@b2", b2);
cn.Open();

SqlDataReader dr;
try
{
    dr = cmd.ExecuteReader();
    while (dr.Read())
    {
        progressBar1.Value = progressBar1.Value + 9; 
        listBox1.Items.Add(dr["path"].ToString());
    }
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message);
}
finally
{
    cn.Close();
}

/*after this i dont get any data in my list box, where i am expecting the paths of image("path" col in my DB) which should be returned after the comparison query.*/

这是填充的代码（希望我没有弄错，即此代码一张一张地获取图像，然后将它们插入数据库）。

int width = 256;
int height = 128;
int sumr = 0, sumg = 0, sumb = 0;
int rank = 0;
openFileDialog1.Filter = "All Images|*.jpg; *.bmp; *.png; *.gif";
DialogResult dr = openFileDialog1.ShowDialog();

listBox1.Items.Add("Pixel          RED            GREEN      BLUE ");
listBox2.Items.Add("avgR     avgG   avgB   ");


if (dr == System.Windows.Forms.DialogResult.OK)
{
    foreach(string file in openFileDialog1.FileNames)
    {
        try
        {
            Image img = Image.FromFile(file);
            Image img1 = Resizeimage(img, width, height);

            pictureBox1.Image = img1;
            textBox1.Text = file;

            Bitmap img2 = new Bitmap(img1);
            Color c;

            for (int i = 0; i < img2.Width; i++)
            {
                for (int j = 0; j < img2.Height; j++)
                {
                    c = img2.GetPixel(i, j);
                    int r = Convert.ToInt16(c.R);
                    int g = Convert.ToInt16(c.G);
                    int b = Convert.ToInt16(c.B);

                    sumr = sumr + r;
                    sumg = sumg + g;
                    sumb = sumb + b;

                    listBox1.Items.Add(i.ToString() + "," + j.ToString() + "   " + r.ToString() + "    " + g.ToString() + "   " + b.ToString());
                }
            }

            int total = img2.Height * img2.Width;
            int aveR = sumr / total;
            int aveG = sumg / total;
            int aveB = sumb / total;

            listBox2.Items.Add(aveR.ToString() + "   " + aveG.ToString() + "  " + aveB.ToString());

            Application.DoEvents();
            Thread.Sleep(5000);


            SqlConnection con = new SqlConnection(@"Data Source=HOME;Initial   Catalog=test_image;Integrated Security=True");
            MemoryStream ms = new MemoryStream();
            pictureBox1.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

            byte[] pic_arr = new byte[ms.Length];
            ms.Position = 0;
            ms.Read(pic_arr, 0, pic_arr.Length);

            SqlCommand cmd = new SqlCommand("insert into image(path,image,red,green,blue,rank)values(@path,@image,@red, @green, @blue, @rank)", con);              


            cmd.Parameters.AddWithValue("@path", textBox1.Text);
            cmd.Parameters.AddWithValue("@image", pic_arr);
            cmd.Parameters.AddWithValue("@red", aveR);
            cmd.Parameters.AddWithValue("@green", aveG);
            cmd.Parameters.AddWithValue("@blue", aveB);
            cmd.Parameters.AddWithValue("@rank", rank);
            con.Open();
            try
            {
               int rs = cmd.ExecuteNonQuery();
               if (rs > 0)
               {
                     MessageBox.Show("image stored successfully");
               }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                con.Close();
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show("cannot display the image"+ ex.Message);
        }

        listBox1.Items.Clear();
        listBox2.Items.Clear();
    }
  }
}       

public static Image Resizeimage(Image img, int width, int height)
{
    Image newimg = new Bitmap(width, height);
    Graphics g = Graphics.FromImage(newimg);

    g.DrawImage(img, 0, 0, width, height);

    return newimg;
}

/** I am sorry if braces make you all little upset, I am new to this site, so editing might be poor**/
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