ajax控制工具包cascadingdropdown Web服务错误C＃

Question

我正在尝试将Ajax控件工具包cascadingdropdown与Web服务一起使用，但是在使用Web Service时，在初始下拉框中始终出现“ Method Error 0”。 如果我尝试在最初的下拉菜单中不使用Web服务，那么我在第二个下拉菜单中会遇到相同的错误（级联下拉菜单）。

这是我的Web服务代码和下拉列表：

     <asp:DropDownList ID="ServerDropDown" runat="server"></asp:DropDownList>

    <ajaxToolkit:CascadingDropDown
        ID="CascadingDropDown2"
        runat="server"
        TargetControlID="ServerDropDown" 
        Category="ServerID" 
        PromptText="-- Select one --"                         
        ServiceMethod="GetServerValues"
        ServicePath="../App_Data/Search.asmx.cs"
         />


    <asp:DropDownList ID="DatabaseDropDown" runat="server"></asp:DropDownList>

    <ajaxToolkit:CascadingDropDown
        ID="CascadingDropDown1"
        runat="server"
        TargetControlID="DatabaseDropDown" 
        ParentControlID="ServerDropDown"
        Category="DatabaseID" 
        PromptText="-- Select one --"             
        ServiceMethod="GetDatabasesForServer"
        ServicePath="../App_Data/Search.asmx.cs"
         />

服务代码：

using System;
using System.Web;
using System.Web.Services;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using AjaxControlToolkit;
using System.Collections.Generic;

///<summary>
/// Summary description for ServiceCS
///</summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService]


public class Search : System.Web.Services.WebService
{

    [System.Web.Services.WebMethod]
    [System.Web.Script.Services.ScriptMethod]    
    public CascadingDropDownNameValue[] GetDatabasesForServer(string knownCategoryValues, string category)
    {
        //StringDictionary kv = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);

        //int ServerID;
        //if (!kv.ContainsKey("Server") || !Int32.TryParse(kv["Server"], out ServerID))
        //{
        //    return null;
        //}

        string ServerID = CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues)["ServerID"];

        string sSQL = @"SELECT DL.DatabaseID AS value, SL.ServerName + ' - ' + DL.DatabaseName AS DisplayText " +
                "FROM BabelFish.dbo.DatabaseList DL (NOLOCK) " +
                "INNER JOIN BabelFish.dbo.ServerList SL (NOLOCK) ON DL.ServerId = SL.ServerId " +
                "WHERE DL.IsActive = 1 " +
                "AND SL.ServerID = '" + ServerID + "' " +
                "Order by DisplayText";

        DataTable dt = DatabaseAccessing.DatabaseConnection.GetDataTable(sSQL);

        List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();

        for (int i = 0; i < dt.Rows.Count; i++)
        {
            DataRow dr = dt.Rows[i];
            values.Add(new CascadingDropDownNameValue((string)dr["DisplayText"], dr["DatabaseID"].ToString()));
        }

        //List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();

        //foreach (DataRow dr in ds)
        //{
        //    values.Add(new CascadingDropDownNameValue((string)dr["Color"], dr["ColorID"].ToString()));
        //}

        return values.ToArray();
    }

    [System.Web.Services.WebMethod]
    [System.Web.Script.Services.ScriptMethod]
    public CascadingDropDownNameValue[] GetServerValues(string knownCategoryValues, string category)
    {

        string sSQL = @"SELECT ServerId as Value, ServerName as DisplayText " +
            "FROM BabelFish.dbo.ServerList (NOLOCK) " +
            "Order By DisplayText";

        DataTable dt = DatabaseAccessing.DatabaseConnection.GetDataTable(sSQL);

        List<CascadingDropDownNameValue> values = new List<CascadingDropDownNameValue>();

        // tried manually adding if it was issue with data set but did not work eihter
        //values.Add(new CascadingDropDownNameValue("testdispally1", "1"));
        //values.Add(new CascadingDropDownNameValue("testdispally2", "2"));


        for (int i = 0; i < dt.Rows.Count; i++)
        {
            DataRow dr = dt.Rows[i];
            values.Add(new CascadingDropDownNameValue((string)dr["DisplayText"], dr["DatabaseID"].ToString()));
        }


        return values.ToArray();
    }



}// end class

Answer 1

一个朋友为我找到了解决方案。 代码很好，但是AjaxControlToolkit.dll没有针对此特定功能正确注册（或其他方式）。 它已在工具包中正常工作/已注册其他功能。 他使用NUGET下载了ajax工具套件，并将其作为独立的软件包安装并指向该软件包（而不是像我刚才那样直接指向.dll），并且运行良好。

只需测试/确认此配置在发布到服务器时是否有效（我曾因.dll在发布到服务器时基于注册的.dll的注册路径而无法在服务器上工作时遇到问题）。