Question

我想使用VB.Net从具有多列且只有1行记录的数据表中获取1列数据。然后使用ASP.Net将列数据显示到网页中。

在下面的例子中，我想从DataTable中获取Name列数据，然后将其显示在网页上。

这是我的VB.Net代码：

 Imports System
 Imports System.Data
 Imports System.Data.SqlClient
 Imports System.Configuration

Public Class TestDisplayData
   Inherits System.Web.UI.Page

   Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    'Create a Connection Object
    Dim connectionString As String
    Dim connection As SqlConnection
    connectionString = ConfigurationManager.ConnectionStrings("SQLDbConnection").ToString
    connection = New SqlConnection(connectionString)

    'Create SQL Command
    Dim SQL As String = "SELECT Name, Title, Phone FROM contacts"

    'Open the Connection
    connection.Open()

    'Create DataAdaptor Object
    Dim Adaptor As SqlDataAdapter = New SqlDataAdapter()
    Adaptor.SelectCommand = New SqlCommand(SQL, connection)

    'Close the Connection
    connection.Close()

    'Create DataTable Object
    Dim dt As DataTable = New DataTable()

    'Fill DataTable
    Adaptor.Fill(dt)

    'I am not sure what next code are. I want to get the Name column from the DataTable


   End Sub

 End Class

这是我的HTML ASP.Net代码：

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
   <form id="form1" runat="server">
        <div>
            Name: (I want to display the Name column data here)
        </div>
    </form>
</body>
</html>

Answer 1

这里是仅选择一列的代码：

dt.Rows.Item(0).Item("Name")

Answer 2

您可以使用Take（1）click here to see或FirstorDefault（）check it here

我将分享一个示例，您可以查看上面的链接官方文件。

dt.AsEnumerable().Take(1).[Select](Function(s) s.Field(Of String)("Name"))

Answer 3

lblname.text=dt.Rows[0]["Name"].ToString();  VB Code 
 lblname.text=dt.Rows(0).Item("Name").ToString()

隐藏代码

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如何使用ASP.Net上的VB.Net从DataTable中获取1列数据并将其显示给Lable

3 个答案: