Question

我设法将数据从SQL表中的列添加到ComboBox中，但是我需要将所有行都显示在其余的文本框中。（我希望我的措词正确）。

这是我当前的代码：

Imports System.Data.SqlClient


Public Class Form1

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        Dim con As New SqlConnection("Data Source=xxxx;Initial Catalog=ltLeavers;Integrated Security=True")

        Dim da As New SqlDataAdapter("SELECT * FROM dbo.mytable", con)
        Dim dt As New DataTable
        da.Fill(dt)
        ComboBox1.DisplayMember = "DISPLAY_NAME"
        ComboBox1.DataSource = dt

    End Sub

上面的方法没有问题，所有项目都添加到ComboBox中，但是我需要另外两列EMAIL_ADDRESS和DEPARTMENT的相应行从ComboBox中选择的内容添加到TextBoxes中。

Answer 1

在ComboBox的SelectedIndex_Changed事件下；输入以下代码。

Dim dt As New DataTable
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

    Dim con As New SqlConnection("Data Source=xxxx;Initial Catalog=ltLeavers;Integrated Security=True")

    Dim da As New SqlDataAdapter("SELECT * FROM dbo.mytable", con)
    da.Fill(dt)
    ComboBox1.DisplayMember = "DISPLAY_NAME"
    ComboBox1.DataSource = dt

End Sub
Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
    Textbox1.Text = CStr(dt.Rows(ComboBox1.SelectedIndex)("EMAIL_ADDRESS"))
    Textbox2.Text = CStr(dt.Rows(ComboBox1.SelectedIndex)("DEPARTMENT"))
End Sub

您将需要在表单的load事件之外声明数据表dt，以便组合框的SelectedIndex_Changed事件可以看到它。

Answer 2

我建议您使用BindingSource完成它。

尝试一下：

1-声明带有事件的变量类型BindingSource。另外，声明您的数据集将用于数据。

Dim WithEvents BS As New BindingSource
Dim ds As New DataSet

2-在您的Form Load事件中，查询您的数据并将其与Binding Source和ComboBox控件进行绑定。

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
   Dim con As New SqlConnection("Data Source=xxxx;Initial Catalog=ltLeavers;Integrated Security=True")
   Dim da As New SqlDataAdapter("SELECT * FROM dbo.mytable", con)
   da.Fill(ds, "myPopulatedTable")

   ComboBox1.DisplayMember = "id"
   ComboBox1.DataSource = ds.Tables("myPopulatedTable")

   'Here the new code'
   BS.DataSource = ds
   BS.DataMember = "myPopulatedTable"

End Sub

3-添加一个Sub Procedure，以将数据显示到其他文本框控件中。

Private Sub DISPLAYRECORD(Optional ByVal table As String = "myPopulatedTable")
        TextBox1.Text = ds.Tables(table).Rows(Me.BS.Position)("column1").ToString
        TextBox2.Text = ds.Tables(table).Rows(Me.BS.Position)("column2").ToString()
        TextBox2.Text = ds.Tables(table).Rows(Me.BS.Position)("column3").ToString()
End Sub

4-在绑定源的PositionChanged事件中，调用该子过程（上述）

Private Sub BS_PositionChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles BS.PositionChanged
        DISPLAYRECORD()
 End Sub

5-最后，要将数据与ComboBox选择同步，您需要根据ComboBox索引选择更改该绑定源的位置

Private Sub ComboBox1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox1.SelectedIndexChanged
        BS.Position = ComboBox1.SelectedIndex
End Sub

SQL列到TextBox（来自ComboBox）

2 个答案: