[英]ajax control toolkit cascadingdropdown web service error c#
我正在嘗試將Ajax控件工具包cascadingdropdown與Web服務一起使用,但是在使用Web Service時,在初始下拉框中始終出現“ Method Error 0”。 如果我嘗試在最初的下拉菜單中不使用Web服務,那么我在第二個下拉菜單中會遇到相同的錯誤(級聯下拉菜單)。
這是我的Web服務代碼和下拉列表:
<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"
/>
服務代碼:
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
一個朋友為我找到了解決方案。 代碼很好,但是AjaxControlToolkit.dll沒有針對此特定功能正確注冊(或其他方式)。 它已在工具包中正常工作/已注冊其他功能。 他使用NUGET下載了ajax工具套件,並將其作為獨立的軟件包安裝並指向該軟件包(而不是像我剛才那樣直接指向.dll),並且運行良好。
只需測試/確認此配置在發布到服務器時是否有效(我曾因.dll在發布到服務器時基於注冊的.dll的注冊路徑而無法在服務器上工作時遇到問題)。
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