Question

我有一个文本框和组合框和一个数据表（从数据库填充） 数据表有两列，一列是 ID ，另一列是名称组合框与此数据表绑定，如

Form1.ComboBox1.DataSource = dt
    Form1.ComboBox1.DisplayMember = "name"
    Form1.ComboBox1.ValueMember = "id"

如果用户从comboBox1下拉列表中选择显示成员，则会在textbox1中显示值成员

Private Sub ComboBox1_SelectedValueChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedValueChanged
    If ComboBox1.SelectedIndex = -1 Then
        Return
    Else
        TextBox1.Text = ComboBox1.SelectedValue.ToString
    End If

另一个过程是，如果用户在textbox1和textbox1的离开汉字中输入值，当ID输入textbox1并离开控件时，我们写入的内容会自动选择ComboBox1中相应的显示成员。如果不存在则清除textbox1

Private Sub TextBox1_Leave(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.Leave

    Dim dv As DataView
    if ( dv = dv.RowFilter = "id =" & TextBox1.Text.ToString) then
//select the value memeber if record find
//ComboBox1.text = finded diaplay member 
else
textbox1.text = string.empty
ComboBox1.selectindex = -1
end if
End Sub

Answer 1

试试这个：

ComboBox1.SelectedIndex = ComboBox1.FindString(TextBox1.Text)

我每天都在使用C＃，但我认为这个VB语法应该是正确的

Answer 2

在TextBox1_Leave处理程序中，只需要具有以下内容：

Private Sub TextBox1_Leave(sender As Object, e As EventArgs) Handles TextBox1.Leave
    Dim value As String = TextBox1.Text
    ComboBox1.SelectedValue = value
End Sub

textbox中的value成员和combobox中的display member

2 个答案: