设置上下文键时Ajax自动完成未触发

Question

我正在尝试传递一个额外的参数，这样当用户从下拉列表中选择一个状态时，具有自动完成功能的文本框将只显示它=所选状态的结果。由于某种原因，添加此项时函数getcompletionlist没有启动？

Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.ComponentModel
Imports System.Data.SqlClient
' To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the            following   line.
<System.Web.Script.Services.ScriptService()> _
 <System.Web.Services.WebService(Namespace:="http://tempuri.org/")> _
 <System.Web.Services.WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
 <ToolboxItem(False)> _
Public Class AutoComplete1
Inherits System.Web.Services.WebService
<WebMethod()> _
Public Function GetCompletionList(prefixText As String, count As Integer, Contextkey As String) As String()
    Try
        Dim Con As SqlConnection
        Dim cmd As SqlCommand
        Con = New SqlConnection
        'Dim test As String
        'test = Contextkey
        Con.ConnectionString = ""
        Con.Open()
        cmd = New SqlCommand
        cmd.Connection = Con
        cmd.CommandText = "SELECT NPI, [Entity Type Code], [Provider Last Name (Legal Name)], [Provider First Name], [Provider Business Mailing Address City Name] FROM NPIData WHERE [Provider Last Name (Legal Name)] LIKE @Provider + '%'"
        cmd.Parameters.AddWithValue("@Provider", prefixText)
        Dim customers As List(Of String) = New List(Of String)
        Dim reader As SqlDataReader = cmd.ExecuteReader()
        While reader.Read
            customers.Add(reader("Provider Last Name (Legal Name)").ToString + ", " + reader("Provider First Name").ToString + ", " + reader("Provider Business Mailing Address City Name").ToString)
        End While
        Con.Close()
        Return customers.ToArray
    Catch ex As Exception
    End Try
End Function  
End Class

这是我的aspx自动完成代码：

    <asp:TextBox ID="TextBox1" runat="server" Height="27px" Width="375px"></asp:TextBox>
        <asp:AutoCompleteExtender ID="AutoCompleteExtender" runat="server" 
    DelimiterCharacters="" Enabled="True" ServicePath="AutoComplete.asmx"  
    ServiceMethod="GetCompletionList" TargetControlID="TextBox1" 
    MinimumPrefixLength="2" UseContextKey="true" ContextKey="State">
    </asp:AutoCompleteExtender>
Protected Sub StateDropDown_SelectedIndexChanged(sender As Object, e As EventArgs) Handles        StateDropDown.SelectedIndexChanged
    AutoCompleteExtender.ContextKey = StateDropDown.Text
End Sub

Answer 1

Public Function GetCompletionList(ByVal prefixText As String,ByVal count As Integer,ByVal          contextKey As String) As String()

Answer 2

我知道发表评论太晚了，但请在webmethod中将ContextKey更改为ContextKey，希望它能在中工作