Question

   using (StringWriter sw = new StringWriter())
        {
            using (HtmlTextWriter hw = new HtmlTextWriter(sw))
            {
                StringBuilder sb = new StringBuilder();

                //Generate Invoice (Bill) Header.
                sb.Append("<table width='100%' cellspacing='0' cellpadding='2'>");

                sb.Append("<tr><td align='center' style='background-color: #18B5F0' colspan = '2'><b>Load Sheet</b></td></tr>");
                sb.Append(" </td></tr>");
                sb.Append("<br />");
                sb.Append("<br />");
                sb.Append("<br />");
                sb.Append("<br />");


                sb.Append("</td><td><b>Date: </b>");
                sb.Append(DateTime.Now);

                s

                sb.Append("</td><td><b>Username: </b>");
                sb.Append(user);

                sb.Append("</td></tr>");

                sb.Append("<tr><td ><b>Route: </b>");
                sb.Append(route);



                sb.Append("<tr><td><b>Date Order Loaded: </b>");
                sb.Append(lDate);
                sb.Append("</td></tr>");




                sb.Append("</table>");
                sb.Append("<br />");
                sb.Append("<br />");
                sb.Append("<br />");
                sb.Append("<br />");
                sb.Append("<br />");



                //Generate Dispatch Sheet Items Grid.
                sb.Append("<table border = '1'>");
                sb.Append("<tr>");
                foreach (DataColumn column in data.Columns)
                {
                    sb.Append("<th style = 'background-color: #D20B0C;color:#000000'>");
                    sb.Append(column.ColumnName);
                    sb.Append("</th>");
                }
                sb.Append("</tr>");
                foreach (DataRow row in data.Rows)
                {

                    sb.Append("<tr>");
                    foreach (DataColumn column in data.Columns)
                    {
                        sb.Append("<td>");
                        sb.Append(row[column]);
                        sb.Append("</td>");

                    }
                    sb.Append("</tr>");
                }
                sb.Append("</tr></table>");
                sb.Append("<br />");
                sb.Append("<br />");
                sb.Append("<br />");
                sb.Append("<br />");

                sb.Append("<table>");
                sb.Append("<tr><td colspan = '2'></td></tr>");
                sb.Append("<tr><td><b>Driver Name:___________________</b><br/>");
                sb.Append(driver);
                sb.Append("</tr></td>");





                Page.ClientScript.RegisterStartupScript(typeof(Page), "MessagePopUp", "alert('Transaction completed successfully'); window.location.href = 'LoadSheet.aspx';", true);


                //Export HTML String as PDF.
                StringReader sr = new StringReader(sb.ToString());
                Document pdfDoc = new Document(PageSize.A4, 10f, 10f, 10f, 0f);
                HTMLWorker htmlparser = new HTMLWorker(pdfDoc);
                PdfWriter writer = PdfWriter.GetInstance(pdfDoc, Response.OutputStream);
                pdfDoc.Open();
                htmlparser.Parse(sr);
                pdfDoc.Close();
                Response.ContentType = "application/pdf";


                Response.End();

                GridView1.AllowPaging = false;
                GridView1.DataBind();

            }

这些代码行基本上确保toss_number包含一串数字。有更好/更有效的方法吗？

Answer 1

另一种方法是使用try / except。如果输入数字，通常会更有效率。

while True:
    try:
        toss_number = int(input("How many times do you want to toss the coin?\n"))
        break
    except ValueError:
        print('You have not entered a NUMBER.')

引发ValueError时会打印一条消息，但循环不会中断，因此我们会返回while循环和try部分的开头。

有没有更好的方法来确保变量只包含数字

1 个答案: