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我的背景是PHP/MySQL,但我目前正在嘗試學習如何使用ASP.Net與MySQL。我創建了一個允許用戶添加任務的小應用程序。我試圖在按下按鈕時檢索任務的完整列表。有一次,我得到了第一行的大約一半顯示的結果,沒有其他任何東西(taskid & createdate)。這不再顯示,我不知道爲什麼。如何在ASP.Net中使用DataGrid顯示來自mysql數據庫的數據?
有沒有人有任何建議或信息可以幫助我解決這個問題?
您可以在www.galtechsolutions.net/tasklist
我的標記,查看應用程序是:
<%@ 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>
我後面的代碼是:
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
在此先感謝,
彼得
爲什麼使用舊的'DataGrid'控件而不是'GridView'?你還在ASP.NET 1.1上嗎? http://msdn.microsoft.com/en-gb/magazine/cc163933.aspx –
我試圖用你的代碼重新創建問題。並得到了幾個錯誤。你可以在課後發佈完整的代碼嗎? –
只是想對那些回答這個問題的人表示感謝。他們的建議,建議和幫助非常感謝。 – galtech