Telerik BusyIndicator不显示

Question

我正在使用WCF服务

我有这个问题：

当我在异步函数调用开始时从服务器为我的GridView检索数据时，我设置了IsBusy = "True"。在调用该方法之后，我设置了IsBusy = "False"。在方法调用期间，不显示RadBusyIndicator。我不明白问题出在哪里。

我已经上传了一个简单的项目与这个问题。你能检查一下吗？Download

Answer 1

我在BackgroundWorker中移动了加载，你能试试这个吗：

private void LoadData()
{
    //Activate BudyIndicator
    App.Instance.SetBusy();

    BackgroundWorker worker = new BackgroundWorker();
    worker.DoWork += (o, ea) =>
    {
        ObservableCollection<CustomerModel> LoadedCustomers = null;

        //Create Client
        proxy.ServicesClient client = new proxy.ServicesClient();
        ObservableCollection<Customer> customers = client.GetCustomers();

        LoadedCustomers = new ObservableCollection<CustomerModel>();
        foreach (var item in customers)
        {
            LoadedCustomers.Add(new CustomerModel()
            {
                CustomerId = item.CustomerId,
                Title = item.Title,
                FirstName = item.FirstName,
                MiddleName = item.MiddleName,
                LastName = item.LastName,
                CompanyName = item.CompanyName,
                SalesPerson = item.SalesPerson,
                EmailAddress = item.EmailAddress,
                Phone = item.Phone
            });
        }
        client.Close();

        //Define return value
        ea.Result = LoadedCustomers;
    };
    worker.RunWorkerCompleted += (o, ea) =>
    {
        //Get returned value
        ObservableCollection<CustomerModel> model = ea.Result as ObservableCollection<CustomerModel>;
        if (model != null)
        {
            Customers = model;
        }

        //Desactivate BusyIndicator
        App.Instance.UnSetBusy();
    };
    worker.RunWorkerAsync();
}

Answer 2

好的，我明白你的问题了。代理上的Close方法等待异步调用的结果。只需在GetCustomersCompleted方法中移动您的client.Close()；，这将会起作用。(使用您的样本进行测试)

private proxy.ServicesClient client = null;
private void LoadData()
{
    App.Instance.SetBusy();

    client = new proxy.ServicesClient();
    client.GetCustomersCompleted += (s, e) =>
    {
        if (e.Error != null)
        {
            throw new Exception();
        }
        else
        {
            Customers = new ObservableCollection<CustomerModel>();

            foreach (var item in e.Result)
            {
                Customers.Add(new CustomerModel()
                    {
                        CustomerId = item.CustomerId,
                        Title = item.Title,
                        FirstName = item.FirstName,
                        MiddleName = item.MiddleName,
                        LastName = item.LastName,
                        CompanyName = item.CompanyName,
                        SalesPerson = item.SalesPerson,
                        EmailAddress = item.EmailAddress,
                        Phone = item.Phone
                    });
            }

            OnPropertyChanged("Customers");
        }
        client.Close();//Close after the return
        App.Instance.UnSetBusy();
    };
    client.GetCustomersAsync();
    //client.Close();
}
}

Answer 3

如果您的窗口xaml不在忙指示器内，它可能不会显示。使用该控件，当繁忙指示器设置为true时，您需要将希望屏蔽的内容放在指示器标记内。如果您的UserControl的主要显示项是一个网格，则将该网格包含在繁忙指示器标记中。

<UserControl>
  <telerik:RadBusyIndicator IsBusy={Binding Busy}>
      <Grid>
         content...
      </Grid>
   </telerik:RadBusyIndicator>
</UserControl>

这应该会给你想要的结果。