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在这里，我试图从组合框中的数据库中获取列。
下面的代码导致组合框System.Data.DataViewManagerListItemTypeDescriptor在组合框中。
我的代码中缺少什么？

Imports System.Data
Imports System.Data.OleDb

Public Class Sales
    Private Const s As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Users\HOME\Desktop\Project\company\company\login.mdb"
    Public conn As OleDbConnection
    Public adapt As OleDbDataAdapter
    Public ds As DataSet
    Public tables As DataTableCollection
    Public table As DataTable
    Public rows As DataRowCollection
    Public row As DataRow
    Public cols As DataColumnCollection
    Public col As DataColumn
    Public sql As String
    Public isql, usql, dsql As String
    Public icmd, ucmd, dcmd As OleDbCommand
    Public p As OleDbParameter

    Private Sub Sales_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'LoginDataSet1.Login' table. You can move, or remove it, as needed.
        Me.LoginTableAdapter.Fill(Me.LoginDataSet1.Login)
        Try
            sql = "select cust_ID from Customer"
            conn = New OleDbConnection(s)
            adapt = New OleDbDataAdapter(sql, conn)
            ds = New DataSet
            conn.Open()

            adapt.Fill(ds, "ABC")
            ComboBox1.DataSource = ds
            ComboBox1.DisplayMember = "cust_ID"
            ComboBox1.ValueMember = "cust_ID"


            conn.Close()

        Catch ex As Exception

        End Try
    End Sub
End Class
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1 回答 1

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一个数据集包含数据表，所以你想要

Dim connStr = "Data Source=.\SQLEXPRESS;Initial Catalog=testing;Integrated Security=true;"
Dim sql = "SELECT str FROM testTable"
Dim da = New SqlDataAdapter(sql, connStr)
Dim ds = New DataSet
da.Fill(ds)
ComboBox1.DataSource = ds.Tables(0)
ComboBox1.DisplayMember = "str"
ComboBox1.ValueMember = "str"

但直接使用 DataTable 更简单：

Dim connStr = "Data Source=.\SQLEXPRESS;Initial Catalog=testing;Integrated Security=true;"
Dim sql = "SELECT str FROM testTable"
Dim da = New SqlDataAdapter(sql, connStr)
Dim dt = New DataTable
da.Fill(dt)
ComboBox1.DataSource = dt
ComboBox1.DisplayMember = "str"
ComboBox1.ValueMember = "str"

当然，您将使用我使用的 SqlWhatever 命令的 OleDbWhatever 等效命令。

于 2012-10-07T19:21:24.347 回答