【IT168技术文档】
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
