在ASP.Net C＃Webform中的HTML表中显示DataTable
[英]Display DataTable in HTML Table in ASP.Net C# Webform
问题描述
I refer this website to try to write code - Display DataTable in HTML Table in ASP.Net C# Webform： http://www.aspsnippets.com/Articles/Display-DataTable-in-HTML-Table-in-ASPNet-using-C-and-VBNet.aspx 
我指该网站尝试编写代码-在ASP.Net C＃Webform的HTML表中显示数据表： http : //www.aspsnippets.com/Articles/Display-DataTable-in-HTML-Table-in-ASPNet-using- C和VBNet.aspx
But can't show table information,show empty page. 但无法显示表格信息，显示空白页。 How can I fix this code？Thanks. 我该如何解决此代码？谢谢。
1.CS.aspx 1.CS.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="CS.aspx.cs" Inherits="CS" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
`body { font-family: Arial;font-size: 10pt; }`
table {
border: 1px solid #ccc;
border-collapse: collapse;
}
table th {
background-color: #F7F7F7;
color: #333;
font-weight: bold;
}
table th, table td {
padding: 5px;
border-color: #ccc;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<div style="margin-left: auto; margin-right: auto; text-align: center;">
<asp:PlaceHolder ID="placeholder" runat="server" />
</div>
</form>
</body>
</html>
2.CS.aspx.cs 2.CS.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
using System.Text;
using System.Configuration;
public partial class CS : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
PlaceHolder placeholder = new PlaceHolder();
//Populating a DataTable from database.
DataTable dt = this.GetData();
//Building an HTML string.
StringBuilder html = new StringBuilder();
//Table start.
html.Append("<table border = '1'>");
//Building the Header row.
html.Append("<tr>");
foreach (DataColumn column in dt.Columns)
{
html.Append("<th>");
html.Append(column.ColumnName);
html.Append("</th>");
}
html.Append("</tr>");
//Building the Data rows.
foreach (DataRow row in dt.Rows)
{
html.Append("<tr>");
foreach (DataColumn column in dt.Columns)
{
html.Append("<td>");
html.Append(row[column.ColumnName]);
html.Append("</td>");
}
html.Append("</tr>");
}
//Table end.
html.Append("</table>");
string strText = html.ToString();
////Append the HTML string to Placeholder.
placeholder.Controls.Add(new Literal { Text = html.ToString() });
}
}
private DataTable GetData()
{
string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
using (SqlConnection con = new SqlConnection(constr))
{
using (SqlCommand cmd = new SqlCommand("SELECT TOP 10 [a01],[a02],[a03] FROM [aaa].[dbo].[bbb]"))
{
using (SqlDataAdapter sda = new SqlDataAdapter())
{
cmd.Connection = con;
sda.SelectCommand = cmd;
using (DataTable dt = new DataTable())
{
sda.Fill(dt);
return dt;
}
}
}
}
}
}
2 个解决方案
解决方案1
3 2016-05-23 04:27:45
Comment out this line and it will work: 注释掉这一行，它将起作用：
PlaceHolder placeholder = new PlaceHolder();
Just a thought.Rather than manually looping through the DataTable why not use the GridView control? 只是一个想法。为什么不使用GridView控件而不是手动遍历DataTable ？
Code behind: 后面的代码：
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
DataTable dt = this.GetData();
gridView.DataSource = dt;
gridView.DataBind();
}
}
ASPX Page: ASPX页面：
<asp:GridView ID="gridView" runat="server"></asp:GridView>
解决方案2
2 已采纳 2016-05-23 04:23:35
If I had the points, I would have just made a comment but to fix your problem, all you need to do is comment out the following line: 如果我有要点，我会发表评论，但要解决您的问题，您要做的就是注释掉以下行：
PlaceHolder placeholder = new PlaceHolder();
The reason being is that, you have a PlaceHolder named placeholder on your markup, then create a completely new placeholder variable of Type PlaceHolder in the load code. 原因是，您的标记上有一个名为placeholder的PlaceHolder ，然后在装入代码中创建一个类型为PlaceHolder全新placeholder变量。 Whilst they are named the same, the code considers them 2 completely different objects. 虽然它们的名称相同，但是代码将它们视为2个完全不同的对象。 See code below, also I borrowed someone else's code to create a datatable , since I don't have access to your db. 请参见下面的代码， 还我借别人的代码来创建一个datatable ，因为我没有访问您的分贝。
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
/*
Commented out because doing it this way creates
2 PlaceHolder variables named placeholder, everything else is as needed
*/
//PlaceHolder placeholder = new PlaceHolder();
//Populating a DataTable from database.
DataTable dt = this.GetData();
//Building an HTML string.
StringBuilder html = new StringBuilder();
//Table start.
html.Append("<table border = '1'>");
//Building the Header row.
html.Append("<tr>");
foreach (DataColumn column in dt.Columns)
{
html.Append("<th>");
html.Append(column.ColumnName);
html.Append("</th>");
}
html.Append("</tr>");
//Building the Data rows.
foreach (DataRow row in dt.Rows)
{
html.Append("<tr>");
foreach (DataColumn column in dt.Columns)
{
html.Append("<td>");
html.Append(row[column.ColumnName]);
html.Append("</td>");
}
html.Append("</tr>");
}
//Table end.
html.Append("</table>");
string strText = html.ToString();
////Append the HTML string to Placeholder.
placeholder.Controls.Add(new Literal { Text = html.ToString() });
}
}
private DataTable GetData()
{
// Modified your method, since I don't have access to your db, so I created one manually
// Here we create a DataTable with four columns.
DataTable table = new DataTable();
table.Columns.Add("Dosage", typeof(int));
table.Columns.Add("Drug", typeof(string));
table.Columns.Add("Patient", typeof(string));
table.Columns.Add("Date", typeof(DateTime));
// Here we add five DataRows.
table.Rows.Add(25, "Indocin", "David", DateTime.Now);
table.Rows.Add(50, "Enebrel", "Sam", DateTime.Now);
table.Rows.Add(10, "Hydralazine", "Christoff", DateTime.Now);
table.Rows.Add(21, "Combivent", "Janet", DateTime.Now);
table.Rows.Add(100, "Dilantin", "Melanie", DateTime.Now);
return table;
}
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