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我有一个包含所有品牌列表的组合框，我需要将组合框的这个选定值传递给名为 service1.svc 的 wcf 服务。我无法理解如何将所选项目作为参数传递给服务。你们能不能帮帮我。谢谢

我的服务参考如下

命名空间 SilverlightApplication2.Web {

public class Service1
{

    [OperationContract]
    public ObservableCollection<Employee> GetAllEmployees(string brandID)  
    {
        var emps = new ObservableCollection<Employee>();
        string connect = ConfigurationManager.ConnectionStrings["yoyo"].ToString();

        using(var con = new OdbcConnection(connect))
        {


            string query = "Select new,brand,imagelink FROM pivottable WHERE brand='"+brandID+"'";


            var cmd = new OdbcCommand(query, con);


            con.Open();



            using (var dr = cmd.ExecuteReader())
            {
                while(dr.Read())
                {
                    var emp = new Employee();
                    emp.EmployeeID = dr.GetInt32(0);
                    emp.FirstName = dr.GetString(1);
                    emp.ImageURI = new Uri(dr.GetString(2));
                    emps.Add(emp);

                }


            }



        }

        return emps; 
    }


}

}

我的 mainpage.xaml.cs 如下

命名空间 SilverlightApplication2 {

   public partial class MainPage : UserControl
{

   public MainPage()
    {
        InitializeComponent();
        object selectedItem = Combobox.SelectedItem;

        var proxy = new Service1Client(selectedItem.ToString());
      //  var proxy = new Service1Client();
        proxy.GetAllEmployeesCompleted += proxy_GetAllEmployeesCompleted;
       proxy.GetAllEmployeesAsync();

       var proxytwo = new Service1Client();
       proxytwo.GetAllBrandsCompleted += proxytwo_GetAllBrandsCompleted;
       proxytwo.GetAllBrandsAsync();
    }

    void proxytwo_GetAllBrandsCompleted(object sender, GetAllBrandsCompletedEventArgs f)
    {
        Combobox.ItemsSource = f.Result;
    }


    void proxy_GetAllEmployeesCompleted(object sender,GetAllEmployeesCompletedEventArgs e)
    {


        Pivot.ItemsSource = e.Result;


    }

        private void btnAdd_Click(object sender, RoutedEventArgs e)
    {
        object selectedItem = Combobox.SelectedItem;
        MessageBox.Show("Selected item is" +selectedItem.ToString());

    }



}

}

我得到对象引用未设置为对象的实例。在 var proxy = new Service1Client(selectedItem.ToString());

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1 回答 1

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var proxy = new Service1Client();

proxy.GetAllEmployeesCompleted += proxy_GetAllEmployeesCompleted;
proxy.GetAllEmployeesAsync(selectedItem.ToString());

如果在最后一行出现编译器错误，则需要更新服务代理。右键单击您的服务参考并选择与您的 IDE 语言中的“更新”最接近的内容。

于 2014-08-18T16:25:39.447 回答