我的背景是PHP/MySQL,但我目前正试图学习如何使用ASP。Net与MySQL。我创建了一个允许用户添加任务的小应用程序。我试图检索任务的完整列表时,按下一个按钮。有一次,我得到的结果是,第一行大约有一半是显示的,其他什么都没有(taskkid &createdate)。那不再出现了,我不知道为什么。
谁有什么建议或信息可以帮助我解决这个问题?您可以在www.galtechsolutions.net/tasklist查看应用程序
My Markup is:
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="viewtasks.aspx.vb" Inherits="MyTasks.ViewTasks" %>
<!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">
<link href="style.css" rel="Stylesheet" media="screen" />
<title>TaskList - View Tasks</title>
</head>
<body>
<a href="default.aspx">Home</a> | <a href="addtask.aspx">Add Task</a> | <a href="viewtasks.aspx">View Tasks</a>
<br /><br />
<form id="form1" runat="server">
<div>
<asp:Button ID="gettasks" runat="server" Text="Show Tasks" class="taskbutton" />
<br /><br />
<asp:DataGrid ID="DataGridView1" runat="server" PageSize="5" AllowPaging="True"
DataKeyField="taskid" AllowSorting="True"
EmptyDataText="There are no data records to display" AutoGenerateColumns="false">
<Columns>
<asp:BoundColumn HeaderText="taskid" DataField="taskid"></asp:BoundColumn>
<asp:BoundColumn HeaderText="createdate" DataField="createdate"></asp:BoundColumn>
<asp:BoundColumn HeaderText="taskname" DataField="taskname="></asp:BoundColumn>
<asp:BoundColumn HeaderText="taskdesc" DataField="taskdesc"></asp:BoundColumn>
<asp:BoundColumn HeaderText="duedate" DataField="duedate"></asp:BoundColumn>
</Columns>
</asp:DataGrid>
<asp:Label ID="gettaskslabel" runat="server"></asp:Label>
<br />
<br />
</div>
</form>
</body>
</html>
后面的代码是:
Protected Sub gettasks_Click(sender As Object, e As EventArgs) Handles gettasks.Click
Dim conn As MySqlConnection
Dim selcmd As MySqlCommand
Dim SQL As String
conn = New MySqlConnection("Data Source=phaspdev1.db.10654019.hostedresource.com;Database=phaspdev1;User Id=;Password=;")
selcmd = New MySqlCommand
Try
conn.Open()
SQL = "SELECT * FROM mytasks"
selcmd.Connection = conn
selcmd.CommandText = SQL
dtadapter.SelectCommand = selcmd
dtadapter.Fill(dt)
DataGridView1.DataSource = dt
DataGridView1.DataBind()
DataGridView1.DataSource = dt.Columns.Add("taskid", GetType(Integer))
DataGridView1.DataSource = dt.Columns.Add("createdate", GetType(Date))
DataGridView1.DataSource = dt.Columns.Add("taskname", GetType(String))
DataGridView1.DataSource = dt.Columns.Add("taskdesc", GetType(String))
DataGridView1.DataSource = dt.Columns.Add("duedate", GetType(Date))
For Each dr As DataRow In dt.Rows
dt.Rows.Add(dr)
Next dr
dt.AcceptChanges()
Catch ex As Exception
Console.WriteLine("Cannot connect to database: " & ex.Message)
Finally
conn.Close()
conn.Dispose()
End Try
End Sub
提前感谢,
彼得尝试将autoeventwireup设置为true。听起来好像你没有在按钮上设置事件处理程序。
http://msdn.microsoft.com/en-us/library/system.web.configuration.pagessection.autoeventwireup.aspx