Question

我是WPF的初学者。我正在尝试使用从wcf服务

检索的可观察集合来填充组合框

xaml代码：

<ComboBox x:Name="cmbclass" ItemsSource="{Binding ClassList}" VerticalAlignment="Top" DisplayMemberPath="ClassName" SelectedValuePath="ClassID"/>

消费服务：

ServiceReference1.Service1Client ClassList = new ServiceReference1.Service1Client();
ObservableCollection<ClassDO> Classlist = new ObservableCollection<ClassDO>();
Classlist = (ObservableCollection<ClassDO>)ClassList.GetClassList();
cmbclass.ItemsSource = Classlist;
cmbclass.DisplayMemberPath = "ClassID";
cmbclass.SelectedValuePath = "CLassName";

我得到以下错误，有人可以帮助我吗？

错误1
'SchoolManagementSystem.ServiceReference1.ClassDO []'到 System.Collections.ObjectModel.ObservableCollection'D：\ Dotnet \ Projects \ WPF \ WindowsPhoneApps \ SchoolManagementSystem \ SchoolManagementSystem \ MainWindow.xaml.cs 37 23 SchoolManagementSystemCannot转换类型

任何帮助都将不胜感激。

Answer 1

请看一下这段代码。此示例使用MVVM design pattern

ViewModel

public class MainViewModel
{
    public MainViewModel()
    {
        ServiceReference1.Service1Client client = new erviceReference1.Service1Client();
        Classlist = new ObservableCollection<ClassDO>(client.GetClassList());
    }

    public ObservableCollection<ClassDO> ClassList { get; set; }
}

视图

<ComboBox ItemsSource="{Binding ClassList}" VerticalAlignment="Top" DisplayMemberPath="ClassName" SelectedValuePath="ClassID"/>

在视图的代码隐藏中设置datacontext

this.DataContext = new MainViewModel();

在这个例子中，我假设GetClassList() IEnumerable ClassDO返回

Answer 2

我得到了如何用WCF消耗的可观察集合来填充组合框 Xaml代码：

 <ComboBox x:Name="Cmbclass" ItemsSource="{Binding Classlist}" VerticalAlignment="Center" DisplayMemberPath="ClassName" SelectedValuePath="ClassID" Loaded="CmbClassListLoaded"></ComboBox>

Consumingservice：

public void GetClassList()
{
ServiceReference1.Service1Client ServiceClient = new ServiceReference1.Service1Client();
ObservableCollection<ClassDO> Classlist = ServiceClient.GetClassList();
Cmbclass.ItemsSource = Classlist;
Cmbclass.DisplayMemberPath = "classname";
//Cmbclass.se = "ClassID";
Cmbclass.SelectedValuePath = "classid";

}

现在在windowload方法中调用Getclasslist

使用wcf服务消耗的可观察列表填充Combobox

2 个答案: