Question

问题

我正在尝试为包含图像的每一行创建一个控件。

private void ass_wijzig_Load(object sender, EventArgs e)
{
    //query's
    string count = "select COUNT(Image) from product";
    string query = "select image from product";
    //commands
    MySqlCommand cmd = new MySqlCommand(count, connection);
    cmd.CommandType = CommandType.Text;
    int totalcount = Convert.ToInt32(cmd.ExecuteScalar());
    MySqlCommand cmd2 = new MySqlCommand(query, connection);
    MySqlDataReader reader = cmd2.ExecuteReader();
    if (reader.Read())
    {
        for (int i = 0; i <= totalcount; i++)
        {
            //What do I need to put here?
        }
    }

案例

程序会查看产品表中有多少行。每个创建的行都包含一个图像。我希望程序检查有多少行（有效），然后创建一个包含行中图像的图片框。正如您所看到的，我已经确定每一行都被计算在内。我被告知不要使用数组。要从数据库中检索图片，您需要使用数据适配器和数据表。

问题

如何为表格中的每一行创建一个包含正确图像的图片框？

附件

将一张图片放入图片框的代码

private void ass_wijzig_Load(object sender, EventArgs e)
{
        string query = "Select Image From Product where productid = 1";
        MySqlCommand cmd = new MySqlCommand(query, connection);
        // MySqlDataReader reader = cmd.ExecuteReader();
        var da = new MySqlDataAdapter(cmd);
        var ds = new DataSet();
        da.Fill(ds, "Image");
        int count = ds.Tables["Image"].Rows.Count;



        if (count > 0)
        {
            var data = (Byte[])(ds.Tables["Image"].Rows[count - 1]["Image"]);
            var stream = new MemoryStream(data);
            pictureBox1.Image = Image.FromStream(stream);
        }

非常重要！，高级代码仅用于确保我能够将图像放入图片框中，我已经包含此代码以支持我的声明，即我必须使用数据表和数据适配器。此代码不再包含在我的项目中。

提前致谢

Answer 1

试试这个

private void ass_wijzig_Load(object sender, EventArgs e)
     {
            string query = "Select Image From Product where productid = 1";
            MySqlCommand cmd = new MySqlCommand(query, connection);
            // MySqlDataReader reader = cmd.ExecuteReader();
            var da = new MySqlDataAdapter(cmd);
            var ds = new DataSet();
            da.Fill(ds, "Image");
            int count = ds.Tables["Image"].Rows.Count;
           List<PictureBox> pbList = new List<PictureBox>();

            for (int i = 0; i < count-1; i++)
            {                
                var data = (Byte[])(ds.Tables["Image"].Rows[i]["Image"]);
                var stream = new MemoryStream(data);
                pbList[i] = new PictureBox();               
                pbList[i].Name = "pic" + i;
                pbList[i].Size = new Size(300, 75);
                pbList[i].Image = Image.FromStream(stream);
                myform.Controls.Add(pbList[i]);
            } 
      }

<强>更新

您不需要为PictureBox循环数组

private void ass_wijzig_Load(object sender, EventArgs e)
         {
                string query = "Select Image From Product where productid = 1";
                MySqlCommand cmd = new MySqlCommand(query, connection);
                // MySqlDataReader reader = cmd.ExecuteReader();
                var da = new MySqlDataAdapter(cmd);
                var ds = new DataSet();
                da.Fill(ds, "Image");
                int count = ds.Tables["Image"].Rows.Count;

                for (int i = 0; i < count-1; i++)
                {                
                    var data = (Byte[])(ds.Tables["Image"].Rows[i]["Image"]);
                    var stream = new MemoryStream(data);
                    PictureBox pbList = new PictureBox();               
                    pbList.Name = "pic" + i;
                    pbList.Size = new Size(300, 75);
                    pbList.Image = Image.FromStream(stream);
                    myform.Controls.Add(pbList);
                } 
          }

Answer 2

private void ass_wijzig_Load(object sender, EventArgs e)
{
        string query = "Select Image From Product where productid = 1";

       MySqlDataAdapter adpt=new MySqlDataAdapter(query,connection);
       DataTable dt=new DataTable();
       adpt.Fill(dt);
     if(dt.Rows.Count>0)
     {
      PictureBox pcb[]=new PictureBox[dt.rows.count];
       for(int i=0;i<dt.Rows.Count;i++)
       {
            var data = (Byte[])(dt.Rows[i]["Image"].ToString());
            var stream = new MemoryStream(data);
            pcb[i].Image = Image.FromStream(stream);
       }

     }
}

为每行C＃动态创建控件

2 个答案: