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.v23.2.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