Question

如何通过选择行从dataGridView显示图像并在C＃WindowsForm中将图像显示到pictureBox

问题：无法将图像从datagridView检索到pictureBox。

我试过代码下面如何通过从dataGridView中选择来显示图片框上的图像，该数据已作为字节保存在数据库中。但错误发生，因为System.String无法转换为system.Byte和当我尝试其他代码它说无效参数这里是我的代码下面：

DataGridview使用鼠标单击事件在DataGridView上选择数据时显示值和图像
显示我如何从系统浏览图片并上传到pictureBox
显示如何将图片从图片框保存到数据库。

我希望你能解决我的问题，并帮助我解决这个问题。

private void dataGridView1_MouseClick(object sender, MouseEventArgs e)
     {
       try
       {
            label21.Text = dataGridView1.SelectedRows[0].Cells["M_FirstName"].Value.ToString();
            textBox1.Text = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
            textBox2.Text = dataGridView1.SelectedRows[0].Cells[1].Value.ToString();
            textBox3.Text = dataGridView1.SelectedRows[0].Cells[2].Value.ToString();
            comboBox1.Text = dataGridView1.SelectedRows[0].Cells[3].Value.ToString();
            dateTimePicker1.Text = dataGridView1.SelectedRows[0].Cells[4].Value.ToString();
            textBox6.Text = dataGridView1.SelectedRows[0].Cells[5].Value.ToString();
            textBox7.Text = dataGridView1.SelectedRows[0].Cells[6].Value.ToString();
            textBox8.Text = dataGridView1.SelectedRows[0].Cells[7].Value.ToString();
            textBox9.Text = dataGridView1.SelectedRows[0].Cells[8].Value.ToString();
            textBox10.Text = dataGridView1.SelectedRows[0].Cells[9].Value.ToString();

    //First try to select image from datagridview and display to picturebox
            byte[] image = Encoding.ASCII.GetBytes(dataGridView1.SelectedRows[0].Cells[10].Value.ToString());
            if (image == null)
                pictureBox1.Image = null;
            else
            {
                    var ms= new MemoryStream(image);
              //Error is Invalid Argument (ms)
                    pictureBox1.Image = Image.FromStream(ms);
            }

    //Second try to select image from datagridview and display to picturebox
    //When I tried this code below the Error shows that "*Unable to Cast Object of type 'System.String' to type 'System.Byte[]'*"

            var data = (Byte[])(dataGridView1.SelectedRows[0].Cells[10].Value);
            var stream = new MemoryStream(data);
            pictureBox1.Image = Image.FromStream(stream);

    //Both the Code Above does not work to select image from datagridview and display on picturebox
    //How can I do to make it work.
}
catch(Exception ex)
{
    MessageBox.Show(ex.Message);
}
    }

*****我的代码将图片上传到pictureBox *****

浏览图片的代码

try
        {
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Filter = "*.jpg files(*.jpg)|*.jpg| PNG files(*.png)|*.png| All Fies(*.*)|*.*";

            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                imagelocation = dialog.FileName;
                pictureBox1.ImageLocation = imagelocation;
            }

        }
        catch (Exception)
        {
            MessageBox.Show("An Error Occured", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
        }

******我的代码将图像保存到数据库*****

将图像保存到数据库的代码

try
        {

            if (textBox2.Text == "" || textBox3.Text == "" || comboBox1.Text == "" || textBox6.Text == "" || textBox7.Text == "" || textBox8.Text == "" || textBox9.Text == "" || textBox10.Text == "")
            {
                MessageBox.Show("Please Fill all the fields !");
            }
            else
            {

                byte[] image = null;
                FileStream Streem = new FileStream(imagelocation, FileMode.Open, FileAccess.Read);
                BinaryReader brs = new BinaryReader(Streem);
                image = brs.ReadBytes((int)Streem.Length);



                con.Open();

                String qry = "Insert Into membership_tbl values('" + textBox2.Text + "','" + textBox3.Text + "','" + comboBox1.Text + "','" + dateTimePicker1.Text + "','" + textBox6.Text + "','" + textBox7.Text + "','" + textBox8.Text + "','" + textBox9.Text + "','" + textBox10.Text + "',@image)";

                cmd = new SqlCommand(qry, con);
                cmd.Parameters.Add(new SqlParameter("@image", image));
                cmd.ExecuteNonQuery();
                con.Close();
                MessageBox.Show("Member Added ! ");
                clear();
                Membership mem = new Membership();
                mem.Show();
                this.Hide();
            }

        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

如何通过选择行从dataGridView显示图像，并在C＃WindowsForm中将图像显示到pictureBox

0 个答案: