FetchDataEventArgs.GetFetchExpression<T>() Method

Generates an expression that you can use to obtain appointments from the data source.

Namespace: DevExpress.Xpf.Scheduling

Assembly: DevExpress.Xpf.Scheduling.v25.2.dll

NuGet Package: DevExpress.Wpf.Scheduling

Declaration

C#

public Expression<Func<T, bool>> GetFetchExpression<T>()

VB.NET

Public Function GetFetchExpression(Of T) As Expression(Of Func(Of T, Boolean))

Type Parameters

Name
T

Returns

Type	Description
Expression<Func<T, Boolean>>	An expression that you can use to obtain appointments from the data source.

Remarks

The code snippet below illustrates how to use the GetFetchExpression method to implement the FetchAppointments event.

C#

public void FetchAppointments(FetchDataEventArgs args) {
  using(var dbContext = new SchedulingContext()) {
      args.AsyncResult = dbContext.AppointmentEntities
      .Where(args.GetFetchExpression<AppointmentEntity>())
      .ToArrayAsync();
  }
}

VB.NET

Public Sub FetchAppointments(ByVal args As FetchDataEventArgs)
  Using dbContext = New SchedulingContext()
      Dim res = dbContext.AppointmentEntities.Where(args.GetFetchExpression(Of AppointmentEntity)())
      args.AsyncResult = QueryableExtensions.ToArrayAsync(Of Object)(res)
  End Using
End Sub

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the GetFetchExpression<T>() method.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

VB.NET

wpf-scheduler-load-data-on-demand/VB/CommonDbContext/ViewModels/SchedulingViewModel.vb#L22

Public Sub FetchAppointments(ByVal args As FetchDataEventArgs)
    Dim res = dbContext.AppointmentEntities.Where(args.GetFetchExpression(Of AppointmentEntity)())
    args.AsyncResult = QueryableExtensions.ToArrayAsync(Of Object)(res)