我查看了人们报告的其他问题，但没有一个能解决我遇到的问题。我一直在用这个 walkthrough从 MS 使用 ASP.net 应用程序操作 Access 数据库。不幸的是，添加行的按钮曾经工作过一次，在我的本地网络服务器或内置的 .NET 服务器上不再执行任何操作。我无法弄清楚问题出在哪里，从昨天开始我就一直在用头撞 table 。
这是我的代码；
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="editTest._Default" %>
<!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>
</head>
<body>
<form id="form1" runat="server">
<asp:DataGrid ID="datagrid" runat="server" AutoGenerateColumns="False"
oncancelcommand="datagrid_CancelCommand" oneditcommand="datagrid_EditCommand"
onupdatecommand="datagrid_UpdateCommand">
<Columns>
<asp:EditCommandColumn CancelText="Cancel" EditText="Edit" UpdateText="Update">
</asp:EditCommandColumn>
<asp:BoundColumn DataField="firstName" HeaderText="First Name">
</asp:BoundColumn>
<asp:BoundColumn DataField="lastName" HeaderText="Surname"></asp:BoundColumn>
<asp:BoundColumn DataField="sex" HeaderText="Gender"></asp:BoundColumn>
<asp:BoundColumn DataField="phoneNo" HeaderText="Telephone"></asp:BoundColumn>
</Columns>
</asp:DataGrid>
<div>
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>
C#结束；
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.OleDb;
namespace editTest
{
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) ReadRecords();
}
private void ReadRecords()
{
OleDbConnection cnt = null;
OleDbDataReader rdr = null;
try
{
cnt = new OleDbConnection(
"Provider=Microsoft.Jet.OLEDB.4.0; " +
"Data Source=" + Server.MapPath("test/accessTest.mdb"));
cnt.Open();
OleDbCommand cmd = new OleDbCommand("Select * FROM editTest", cnt);
rdr = cmd.ExecuteReader();
datagrid.DataSource = rdr;
datagrid.DataBind();
}
catch (Exception e)
{
Response.Write(e.Message);
Response.End();
}
finally
{
if (rdr != null) rdr.Close();
if (cnt != null) cnt.Close();
}
}
private void ExecuteNonQuery(string sql)
{
OleDbConnection cnt = null;
try
{
cnt = new OleDbConnection(
"Provider=Microsoft.Jet.OLEDB.4.0; " +
"Data Source=" + Server.MapPath("test/accessTest.mdb"));
cnt.Open();
OleDbCommand cmd =
new OleDbCommand(sql, cnt);
cmd.ExecuteNonQuery();
}
catch (Exception e)
{
Response.Write(e.Message);
Response.End();
}
finally
{
if (cnt != null) cnt.Close();
}
}
protected void datagrid_CancelCommand(object source, DataGridCommandEventArgs e)
{
datagrid.EditItemIndex = -1;
ReadRecords();
}
protected void datagrid_EditCommand(object source, DataGridCommandEventArgs e)
{
datagrid.EditItemIndex = e.Item.ItemIndex;
ReadRecords();
}
protected void datagrid_UpdateCommand(object source, DataGridCommandEventArgs e)
{
int ID = (int)datagrid.DataKeys[(int)e.Item.ItemIndex];
string firstName = ((TextBox)e.Item.Cells[1].Controls[0]).Text;
string lastName = ((TextBox)e.Item.Cells[2].Controls[0]).Text;
string sex = ((TextBox)e.Item.Cells[3].Controls[0]).Text;
string phoneNo = ((TextBox)e.Item.Cells[4].Controls[0]).Text;
string sql =
"UPDATE editTest SET firstName=\"" + firstName +
"\", lastName=\"" + lastName + "\", sex=\"" + sex +
"\", phoneNo=\"" + phoneNo + "\"" +
" WHERE ID=" + ID;
ExecuteNonQuery(sql);
datagrid.EditItemIndex = -1;
ReadRecords();
}
private void Button1_Click(object sender, EventArgs e)
{
string sql = "INSERT INTO editTest (firstName, lastName, sex, phoneNo)"
+ " VALUES (\"new\", \"new\", \"new\", \"new\")";
ExecuteNonQuery(sql);
ReadRecords();
}
}
}
感谢您的帮助
最佳答案
您错过了 aspx 上的事件:
<asp:Button ID="Button1" runat="server" Text="Button" OnClick='Button1_Click' />
并使 Button1_Click 公开或 protected 。
或者，您可以在代码隐藏中设置它:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack) ReadRecords();
Button1.Click += Button1_Click;
}
关于c# - 为什么这个按钮的 OnClick 事件只工作一次？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6594229/