ajax级联下拉列表 [英] ajax cascading dropdown list

问题描述

 am 使用 ajax级联下拉列表当页面加载时希望下拉列表应该选择到我在数据库中存储而不是选择国家/地区选项的国家/地区应    此  我的代码
 
 
  public  CascadingDropDownNameValue [] GetCountry（ string  knownCategoryValues， string  category）
 {
 
 MNBusinessLogic.Admin adm =  new  MNBusinessLogic.Admin（）; 
 DataSet dsUpdate = adm.GetMasters（ 0 ， 国家/地区， 0 ， true ，假）; 
 List< CascadingDropDownNameValue> countrydetails =  new 列表< CascadingDropDownNameValue>（）; 
  if （dsUpdate！=  null && dsUpdate.Tables.Count >   0 && dsUpdate.Tables [ 0 ]。Rows.Count >   0 ）
 {
  foreach （DataRow dtrow  in  dsUpdate.Tables [ 0 ] .Raw）
 {
  string  CountryID = dtrow [  UID]的ToString（）; 
  string  CountryName = dtrow [  MasterKey ]的ToString（）; 
 countrydetails.Add（ new  CascadingDropDownNameValue（CountryName，CountryID））; 
} 
 
} 
  return  countrydetails.ToArray（）; 
} 
 
和aspx代码  
 
< asp：DropDownList ID =   ddlC runat =   server >  
 < /   asp：DropDownList  >  
< ajaxToolkit：CascadingDropDown ID =   cascadingddlC runat =   server  TargetControlID =   ddlC PromptText =   选择国家/地区 LoadingText =  正在加载类别=  国家/地区 ServiceMethod =   GetCountry ServicePath =   cascadingHelper.asmx >  
 < /   ajaxToolkit：CascadingDropDown  >  

解决方案

我得到的答案我只需添加一行代码

 cascadingddlC.SelectedValue = ds1.Tables [0] .Rows [0] [Country]。ToString（）; 

am using ajax cascading dropdownlist when the page gets load i want the dropdownlist should be selected to the country which i had store in database instead of select country option what i should do for it this is my code


public CascadingDropDownNameValue[] GetCountry(string knownCategoryValues, string category)
        {

            MNBusinessLogic.Admin adm = new MNBusinessLogic.Admin();
            DataSet dsUpdate = adm.GetMasters(0, "Country", 0, true, false);
            List<CascadingDropDownNameValue> countrydetails = new List<CascadingDropDownNameValue>();
            if (dsUpdate != null && dsUpdate.Tables.Count > 0 && dsUpdate.Tables[0].Rows.Count > 0)
            {
                foreach (DataRow dtrow in dsUpdate.Tables[0].Rows)
                {
                    string CountryID = dtrow["uid"].ToString();
                    string CountryName = dtrow["MasterKey"].ToString();
                    countrydetails.Add(new CascadingDropDownNameValue(CountryName, CountryID));
                }
                
            }
            return countrydetails.ToArray();
        }

and aspx code is

 <asp:DropDownList ID="ddlC" runat="server">
         </asp:DropDownList>
          <ajaxToolkit:CascadingDropDown ID="cascadingddlC"  runat="server"                        TargetControlID="ddlC" PromptText="Select Country" LoadingText="Loading" Category="Country" ServiceMethod="GetCountry"  ServicePath="cascadingHelper.asmx">
               </ajaxToolkit:CascadingDropDown>

解决方案

i got the answer i had to just add a line of code

cascadingddlC.SelectedValue = ds1.Tables[0].Rows[0]["Country"].ToString();

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