Question

编辑：我一直收到错误：无法等待无效。我的登录方法是bool，但VS说它的空白。我创建了一个新项目，只插入下面的代码和更新的服务参考 - 没有帮助。这是WP代码：

private async void Button_Click(object sender, RoutedEventArgs e)
    {
        WCFserviceReference.Service1Client proxy = new WCFserviceReference.Service1Client();

        bool returnStr = await proxy.loginAsync(passTxtBx.Text, loginTxtBx.Text);
        if (returnStr == true)
        {
            PhoneApplicationService.Current.State["UserName"] = loginTxtBx.Text;
            NavigationService.Navigate(new Uri("/Pages/usrPage.xaml", UriKind.RelativeOrAbsolute));
        }
        else MessageBox.Show("Invalid user credentials");
    }

这是我的服务合同：

[ServiceContract]
public interface IService1
{
    [OperationContract]
    bool login(string usn, string pwd);
}

服务实施：

 public bool login(string usn, string pwd)
        {
            DataClasses1DataContext auth = new DataClasses1DataContext();
            var message = from p in auth.Users
                          where p.usrName == usn && p.usrPass == pwd
                          select p;
            if (message.Count() > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

它不是无效的，不是吗？那有什么不对？

这是客户端生成的代理：

public partial class Service1Client : System.ServiceModel.ClientBase<PhoneApp.WCFserviceReference.IService1>, PhoneApp.WCFserviceReference.IService1 {

    private BeginOperationDelegate onBeginloginDelegate;
    private EndOperationDelegate onEndloginDelegate;
    private System.Threading.SendOrPostCallback onloginCompletedDelegate;
    private BeginOperationDelegate onBeginOpenDelegate;
    private EndOperationDelegate onEndOpenDelegate;
    private System.Threading.SendOrPostCallback onOpenCompletedDelegate;
    private BeginOperationDelegate onBeginCloseDelegate;
    private EndOperationDelegate onEndCloseDelegate;
    private System.Threading.SendOrPostCallback onCloseCompletedDelegate;
    public Service1Client() {
    }

    public Service1Client(string endpointConfigurationName) : 
            base(endpointConfigurationName) {
    }

    public Service1Client(string endpointConfigurationName, string remoteAddress) : 
            base(endpointConfigurationName, remoteAddress) {
    }

    public Service1Client(string endpointConfigurationName, System.ServiceModel.EndpointAddress remoteAddress) : 
            base(endpointConfigurationName, remoteAddress) {
    }

    public Service1Client(System.ServiceModel.Channels.Binding binding, System.ServiceModel.EndpointAddress remoteAddress) : 
            base(binding, remoteAddress) {
    }

当我将鼠标指向proxy.loginAsync(passTxtBx.Text, loginTxtBx.Text);时，它会显示：void Service1Client.loginAsync(string usn, string pwd) (+1 overload(s))

Answer 1

更新您的服务参考，并在您的代理是最新的，然后这应该工作：

private async void loginBtn_Click(object sender, RoutedEventArgs e)
{
    WCFserviceReference.WCFserviceClient proxy = new WCFserviceReference.WCFserviceClient();

    bool returnStr = await proxy.loginAsync(passTxtBx.Text, loginTxtBx.Text);
    if (returnStr == true)
    {
        PhoneApplicationService.Current.State["UserName"] = loginTxtBx.Text;
        NavigationService.Navigate(new Uri("/Pages/usrPage.xaml", UriKind.RelativeOrAbsolute));
    }
    else MessageBox.Show("Invalid user credentials");
}

修改

确保服务器端的方法由[OperationContract]属性修饰：

[OperationContract] public bool login(string usn, string pwd) { DataClasses1DataContext auth = new DataClasses1DataContext(); var message = from p in auth.Users where p.usrName == usn && p.usrPass == pwd select p; if (message.Count() > 0) { return true; } else { return false; } }

修改

在您的客户端代理中没有登录或loginAsync方法。我不知道您是否熟悉Web服务工作流程，因此有基本步骤：

编写服务项目，编译并运行

＆＃34;添加服务参考＆＃34;使用服务wsdl（服务必须运行）并右键单击项目
到客户端项目
关于每次服务更改，再次编译服务项目，运行它并在客户端项目中右键单击服务引用并选择＆＃34;更新服务引用＆＃34;选项。

之后，您将客户端更新。因此，如果您在服务器端编写了方法登录，它也应该出现在客户端。

通过WCF获取返回的bool值

1 个答案: