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我在我的網站上很多地方使用的網頁上有三個CascadingDropDown s。他們從數據庫中加載了國家，地區和地區名稱。我已經成功綁定了數據並將它們設置爲級聯。但是當用戶在我的網站上註冊時，我想在三個CascadingDropDown之間預先選擇三個值。從CascadingDropDown中的數據庫預填充數據
註冊之後，我還需要在管理區域看到他們的數據，我還需要預先選擇三個CascadingDropDown，並選擇用戶的值。但我無法弄清楚如何做到這一點。
我的web服務代碼：
namespace ZetaSolutions.WebProjects.Web.Modules
{
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.Web.Script.Services.ScriptService()]
public class PlaceSelection : System.Web.Services.WebService
{
[WebMethod]
public CascadingDropDownNameValue[] BindCountryDropDown(string knownCategoryValues, string category)
{
SqlConnection conCountry = new SqlConnection(ZetaConfig.ConnectionString);
conCountry.Open();
SqlCommand cmdCountry = new SqlCommand("SELECT * FROM Country ORDER BY Name", conCountry);
SqlDataAdapter daCountry = new SqlDataAdapter(cmdCountry);
cmdCountry.ExecuteNonQuery();
DataSet dsCountry = new DataSet();
daCountry.Fill(dsCountry);
conCountry.Close();
List<CascadingDropDownNameValue> countryDetails = new List<CascadingDropDownNameValue>();
foreach (DataRow dtRow in dsCountry.Tables[0].Rows)
{
string countryId = dtRow["CountryID"].ToString();
string countryName = dtRow["Name"].ToString();
countryDetails.Add(new CascadingDropDownNameValue(countryName, countryId));
}
return countryDetails.ToArray();
}
[WebMethod]
public CascadingDropDownNameValue[] BindDistrictDropDown(string knownCategoryValues, string category)
{
int countryId;
StringDictionary countryDetails = AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
countryId = Convert.ToInt32(countryDetails["Country"]);
SqlConnection conDistrict = new SqlConnection(ZetaConfig.ConnectionString);
conDistrict.Open();
SqlCommand cmdDistrict = new SqlCommand("SELECT * FROM District WHERE [email protected] ORDER BY Name", conDistrict);
cmdDistrict.Parameters.AddWithValue("@CountryID", countryId);
cmdDistrict.ExecuteNonQuery();
SqlDataAdapter daDistrict = new SqlDataAdapter(cmdDistrict);
DataSet dsDistrict = new DataSet();
daDistrict.Fill(dsDistrict);
conDistrict.Close();
List<CascadingDropDownNameValue> districtDetails = new List<CascadingDropDownNameValue>();
foreach (DataRow dtDistrictRow in dsDistrict.Tables[0].Rows)
{
string districtId = dtDistrictRow["DistrictID"].ToString();
string districtName = dtDistrictRow["Name"].ToString();
districtDetails.Add(new CascadingDropDownNameValue(districtName, districtId));
}
return districtDetails.ToArray();
}
[WebMethod]
public CascadingDropDownNameValue[] BindAreaDropDown(string knownCategoryValues, string category)
{
int districtId;
StringDictionary districtDetails = AjaxControlToolkit.CascadingDropDown.ParseKnownCategoryValuesString(knownCategoryValues);
districtId = Convert.ToInt32(districtDetails["District"]);
SqlConnection conArea = new SqlConnection(ZetaConfig.ConnectionString);
conArea.Open();
SqlCommand cmdArea = new SqlCommand("SELECT * FROM Area WHERE [email protected] ORDER BY Name", conArea);
cmdArea.Parameters.AddWithValue("@DistrictID ", districtId);
cmdArea.ExecuteNonQuery();
SqlDataAdapter daArea = new SqlDataAdapter(cmdArea);
DataSet dsArea = new DataSet();
daArea.Fill(dsArea);
conArea.Close();
List<CascadingDropDownNameValue> areaDetails = new List<CascadingDropDownNameValue>();
foreach (DataRow dtAreaRow in dsArea.Tables[0].Rows)
{
string areaId = dtAreaRow["AreaID"].ToString();
string areaName = dtAreaRow["Name"].ToString();
areaDetails.Add(new CascadingDropDownNameValue(areaName, areaId));
}
return areaDetails.ToArray();
}
}
}
我的aspx代碼：
<table>
<tr>
<td>
Country:
</td>
<td>
<asp:DropDownList ID="ddlCountry" runat="server"></asp:DropDownList>
<ajaxToolkit:CascadingDropDown ID="CountryCascading" runat="server" Category="Country" TargetControlID="ddlCountry" LoadingText="Loading Countries..." PromptText="Select Country" ServiceMethod="BindCountryDropDown" ServicePath="PlaceSelection.asmx">
</ajaxToolkit:CascadingDropDown>
</td>
</tr>
<tr>
<td>
District:
</td>
<td>
<asp:DropDownList ID="ddlDistrict" runat="server"></asp:DropDownList>
<ajaxToolkit:CascadingDropDown ID="DistrictCascading" runat="server" Category="District" TargetControlID="ddlDistrict" ParentControlID="ddlCountry" LoadingText="Loading Districts..." PromptText="Select District" ServiceMethod="BindDistrictDropDown" ServicePath="PlaceSelection.asmx">
</ajaxToolkit:CascadingDropDown>
</td>
</tr>
<tr>
<td>
Area:
</td>
<td>
<asp:DropDownList ID="ddlArea" runat="server"></asp:DropDownList>
<ajaxToolkit:CascadingDropDown ID="AreaCascading" runat="server" Category="Area" TargetControlID="ddlArea" ParentControlID="ddlDistrict" LoadingText="Loading Areas..." PromptText="select Areas" ServiceMethod="BindAreaDropDown" ServicePath="PlaceSelection.asmx">
</ajaxToolkit:CascadingDropDown>
</td>
</tr>
</table>
誰能告訴我，我怎麼能解決我的問題？這很緊急。提前致謝。
ChrisBint，我嘗試過這一點，但是這並不在下拉列表... – Ratul