Question

我有一个动态生成图像的webapp（即条形码）。使用用户输入生成图像。用户从数据绑定复选框列表中选择数据，然后使用日期选择器将数据连接到日期，最后用户输入金额。然后，从用户输入的数量创建许多图像。

我的程序运行并生成图像没有问题。我希望最终将用户输入的信息发送到数据库，这样，输入的数量将按顺序排序，每24小时后重置一次。

我的问题是，此时，当我运行我的应用程序并输入信息时，如果选中1复选框，则会更新信息而不会出现问题，并成功生成图像。如果我选择多个复选框，我的数据库将只更新在CheckBoxList中选择的第一个复选框及其在数据库中的相应行。

这是我的C＃代码：

protected void Page_Load(object sender, EventArgs e)
{
     if (!IsPostBack)
     {
           this.CheckBoxListDataBind();
           //Binds Database Data to CheckBoxList1
     }

 }

private string GetConnectionString()
{
     //SQL Connection String
     return System.Configuration.ConfigurationManager.ConnectionString["DatabaseConnection"].ConnectionString;
}


//method to bind CheckBoxList
public void CheckBoxListDataBind()
{
     SqlConnection conn = new SqlConnection(GetConnectionString());

     using (SqlCommand cmd = new SqlCommand())
     {
         cmd.CommandText = "SELECT AccountID, AccountName FROM AccountTable ORDER BY AccountID ASC;"
         cmd. Connection = conn;
         conn.Open();

         using (SqlDataReader sdr = cmd.ExecuteReader())
         {
              while(sdr.Read())
              {

                ListItem. item = new ListItem();             
                item.Text = sdr["AccountID"].ToString() + "-" + sdr["AccountName].ToString(); 
                item.Value = sdr["AccountID"].ToString();
                item.Text = sdr{"AccountName].ToString();  
                cmd.Parameters.AddWithValue("AccountID", CheckBoxList1)
                cmd.Parameters.AddWithValue("AccountName", CheckBoxList1)
                CheckBoxList1.Items.Add(item);

             }
         }

         conn.Close();
     }

//method to generate image
public Bitmap DrawBarcode(string data, string label)
{
    Bitmap dyn_image = new Bitmap(date,Length * 27, 150);

    PointF point = new PointF(2,2)

    Font dyn_image_font = new Font("ImageFontName", 16, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point);

    Font label_font = new Font("Tahoma", 9, System.Drawing.FontStyle.Reguar, System.Drawing.GraphicsUnit.Point);

    Graphics graphics = Graphics.FromImage(dyn_image);

    graphics = Graphics.FromImage(dyn_image);

    graphics.Clear(Color.White);

    graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.SingleBitPerPixel;

    graphics.FillRectangle(new SolidBrush(Color.White), 0, 0, dyn_image.Width, dyn_image.Height);

    graphics.DrawString(dyn_image_font, label_font, new SolidBrush(Color.Black), point);

    RectangleF rectF = new RectangleF(5 , 100, 250, 170); 

    graphics.DrawString(label, label_font, new SolidBrush(Color.Black), rectF);

    graphics.Flush();

    graphics.Dispose();

    System.Web.UI.Controls.Image gen_image = new System.Web.UI.WebControls.Image();

    using (MemoryStream ms = new MemoryStream())
    {
       dyn_image.Save(ms, ImageFormat.Jpeg);
       byte[] byteImage = ms.ToArray();

       Convert.ToBase64String(byteImage);
       gen_image.ImageUrl = "data:image/jpeg;base64," + Convert.ToBase64String(byteImage);

    }

 return dyn_image;

}


//button click method handles user inputs
protected void Generate(object sender, EventArgs e)
{

  CultureInfo provider = CultureInfo.InvariantCulture;
  System.Globalization.DateTimeStyle style = DateTimeStyle.None;
  DateTime dt;
  DateTime.TryParseExact(datepicker.Text, "mmddyyyy", provider, style out dt)"
  int i = Int32.Parse(amount.Text);

  SqlConnection conn = new SqlConnection(GetConnectionString());
  SqlCommand cmd = new SqlCommand();
  cmd.Connection = conn;
  conn.Open();

  cmd.CommandType = CommandType.StoredProcedure;
  cmd.CommandText = "Update_Account_Table";

  cmd.Parameters.AddWithValue("@SeqNum", SqlDbType.VarChar).Value = i;
  cmd.Parameters.AddWithValue("@SeqDate", SqlDbType.DateTime).Value = dt;
  cmd.Parameters.AddWithValue("@Account_ID", SqlDbType.VarChar).Value = CheckBoxList1.SelectedValue;

      foreach(List item in CheckBoxList1.Items)
      {   
         //this forloops is for the DrawImage() method to generate more than
         //one image from user input amount 
         for(int n = 1; n <= i; n++) 
         {

            if (item.Selected)
            {

                System.Web.UI.WebControls.Image img = new System.Web.UI.WebControls.Image();
                string barcode_label = item.Text + "QTY:___________"

                //When image generates, it will show 1 to user input amount                 
                string barode_data = item.Value + datepicker.Text + n.ToSTring("D2");

                 Bitmap dynImage = DrawBarcode(barcode_data, barcode_label)

                 MemoryStream ms = new MemoryStream();

                 dynImage.Save(ms, ImageFormat.Jpeg);

                 byte[] byteImage = ms.ToArray();

                 Convert.ToBase64String(byteImage);

                 img.ImageUrl = "data:image/jpeg;base64," + Convert.ToBase64String(byteImage);

                 panel1.Controls.Add(img);

                  double spacing;

                  double mg = 5;

                  spacing = img.Width.Value + mg;

            }

         } 

          //handling parameters in loop.
         cmd.Parameters["@SeqNum"].Value = amount.Text;
         cmd.Parameters["@SeqDate"].Value = DateTime.ParseExact(datepicker.Text, "mmddyyyy", CultureInfo.InvariantCulture);
         cmd.Parameters["@Account_ID"].CheckBoxList1.SelectedValue;
         cmd.ExecuteNonQuery();
      }

       conn.Close();
}

SQL代码

CREATE TABLE AccountTable
(
    RowID int IDENTITY(1, 1),
    AccountID varchar(2),
    AccountName varchar(50),
    SeqNum int,
    SeqDate datetime
)

CREATE PROCEDURE [ACCOUNTTABLE_UPDATE]
(
  @SeqNum int,
  @SeqDate datetime,
  @Account_ID varchar(2)
)

AS 
SET NOCOUNT ON
BEGIN
UPDATE AccountTable
SET SeqNum = @SeqNum, SeqDate = @SeqDate
WHERE AccountID = @AccountID
END

在我的网页上，我有一个checkboxlist，一个读取int值的文本框，另一个使用JQuery Calender进行输入的文本框，以及一个从网页打印面板的javascript打印函数，最后，CheckBoxList使用另一个javascript函数检查所有框或取消选中它们。

如前所述，我的代码工作正常，但它没有按预期更新数据库。它只会更新数据库中的一行，该行由复选框列表中选择的Account_ID确定。只要选择1，就可以更新任何选择。如果我在复选框列表中选择all，或者多个，则只更新列表中的第一个复选框。

使用DataBound CheckBoxList更新存储过程

0 个答案: