彩票走势图

在窗体中添加如下方法：
       第一个方法是 AutoCompleteKeyUp，它将组合框和 KeyEventArgs 对象作为参数，需要在组合框的 KeyUp 事件中调用此方法；它全根据用户输入的内容选择最接近的内容；
       第二个方法是 AutoCompleteLeave，在激活组合框的 Leave 事件时调用，此方法仅提取用户最终选择的内容，按照组合框中的每个匹配内容修改其大小写。
代码如下：
    Private Sub AutoCompleteKeyUp(ByVal Combo As ComboBox, ByVal e As KeyEventArgs)
        Dim strTyped As String
        Dim intFoundIndex As Integer
        Dim objFoundItem As Object
        Dim strFoundText As String
        Dim strAppendText As String
        '忽略特殊键
        Select Case e.KeyCode
            Case Keys.Back, Keys.Left, Keys.Right, Keys.Up, Keys.Down, Keys.Delete, Keys.CapsLock
                Return
        End Select
        '在查询列表中找到
        strTyped = Combo.Text
        intFoundIndex = Combo.FindString(strTyped)
        If intFoundIndex >= 0 Then
            objFoundItem = Combo.Items(intFoundIndex)
            strFoundText = Combo.GetItemText(objFoundItem)
            strAppendText = strFoundText.Substring(strTyped.Length)
            Combo.Text = strTyped & strAppendText
            Combo.SelectionStart = strTyped.Length
            Combo.SelectionLength = strAppendText.Length
        End If
    End Sub
 
    Private Sub AutoCompleteLeave(ByVal Combo As ComboBox)
        Dim intFoundIndex As Integer
        intFoundIndex = Combo.FindStringExact(Combo.Text)
        Combo.SelectedIndex = -1
        Combo.SelectedIndex = intFoundIndex
End Sub
 
    Private Sub ComboBox1_KeyUp(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles ComboBox1.KeyUp
        AutoCompleteKeyUp(ComboBox1, e)
    End Sub
 
    Private Sub ComboBox1_Leave(ByVal sender As Object, ByVal e As System.EventArgs) Handles ComboBox1.Leave
        AutoCompleteLeave(ComboBox1)
    End Sub