[英]Retrieving data from database in UWP
我正在嘗試從Azure上的SQLDatabase中檢索數據列表,並將其綁定到我在Windows 10的通用應用程序中的列表視圖上。我所做的是創建一個WCF服務來檢索數據,然后在azure上發布,之后在我的應用程序上調用此服務。
我當前的代碼中有錯誤。 這是我的IService1.cs代碼
namespace WcfService2
{
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IService1" in both code and config file together.
[ServiceContract]
public interface IService1
{
// TODO: Add your service operations here
[OperationContract]
List<NYPUnlocking> NYP_GetLockerStatus();
}
// Use a data contract as illustrated in the sample below to add composite types to service operations.
[DataContract]
public class NYPUnlocking
{
[DataMember]
public int lockerID { get; set; }
[DataMember]
public string lockStatus { get; set; }
}
}
Service1.svc.cs:
namespace WcfService2
{
// NOTE: You can use the "Rename" command on the "Refactor" menu to change the class name "Service1" in code, svc and config file together.
// NOTE: In order to launch WCF Test Client for testing this service, please select Service1.svc or Service1.svc.cs at the Solution Explorer and start debugging.
public class Service1 : IService1
{
public List<NYPUnlocking> NYP_GetLockerStatus()
{
SqlConnection conn = new SqlConnection("Copy ADO.net connection string");
string sqlStr = "SELECT * FROM dbo.lockerStatus";
SqlCommand cmd = new SqlCommand(sqlStr, conn);
conn.Open();
SqlDataReader dr = cmd.ExecuteReader();
List<NYPUnlocking> ret = new List<NYPUnlocking>();
while (dr.Read())
{
NYPUnlocking unlock = new NYPUnlocking()
{
lockerID = Int32.Parse(dr["lockerID"].ToString()),
lockStatus = dr["lockStatus"].ToString()
};
ret.Add(unlock);
}
conn.Close();
return ret;
}
}
}
然后我在Azure上發布它,並在我的UWP應用程序上添加對azure網站的服務引用。 以下代碼是我的XAML和cs代碼。
我在x處有錯誤:DataType =“data:NYPUnlocking”,錯誤說“名稱”NYPUnlocking“在命名空間中不存在”使用:NYPUnlock.ServiceReference1“。
<Page.Resources>
<DataTemplate x:DataType="data:NYPUnlocking" x:Key="UserTemplate">
<StackPanel Orientation="Horizontal" Padding="0,0,0,0">
<TextBlock FontSize="12" Text="{x:Bind lockerID}" HorizontalAlignment="Left" Width="200" />
<TextBlock FontSize="12" Text="{x:Bind lockStatus}" HorizontalAlignment="Right" Width="200" />
</StackPanel>
</DataTemplate>
</Page.Resources>
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Width="354">
<ListView x:Name="lvLocker" ItemTemplate="{StaticResource UserTemplate}"/>
<TextBox x:Name="tbError" TextWrapping="Wrap" Text="Error"/>
</StackPanel>
</Grid>
並且我的cs文件在等待task1時出錯“無法將類型'System.Collections.ObjectModel.ObservableCollection'隱式轉換為'NYPUnlock.ServiceReference1.NYPUnlocking []'
namespace NYPUnlock
{
/// <summary>
/// An empty page that can be used on its own or navigated to within a Frame.
/// </summary>
public sealed partial class MainPage : Page
{
public MainPage()
{
this.InitializeComponent();
getStatus();
}
public async void getStatus()
{
try
{
ServiceReference1.Service1Client client = new ServiceReference1.Service1Client(ServiceReference1.Service1Client.EndpointConfiguration.BasicHttpBinding_IService1);
var task1 = client.NYP_GetLockerStatusAsync();
ServiceReference1.NYPUnlocking[] returnResult = await task1;
lvLocker.ItemsSource = returnResult;
}
catch(Exception ex)
{
tbError.Text = ex.Message;
}
}
}
}
我想我正在做的一切正確,可能導致問題的原因是什么? 非常感謝任何幫助,謝謝!
試試看:
將名為“whatevername”的引用添加到XAML文件中的命名空間WcfService2,並在x:DataType="data:NYPUnlocking"
使用此前綴而不是“data:” x:DataType="data:NYPUnlocking"
將returnResult的聲明替換為var類型而不是ServiceReference1.NYPUnlocking[]
類型
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