[英]Unable to cast object of type 'System.Collections.ArrayList' to type 'System.Collections.Generic.IEnumerable'
[英]Blazor Telerik Scheduler - Unable to cast object of type 'System.String' to type 'System.Collections.Generic.IEnumerable`1[System.DateTime]'
我正在嘗試使用從 API 獲取的數據填充 Telerik Blazor 調度程序 UI 組件。我收到的錯誤消息是:
錯誤:System.AggregateException:發生一個或多個錯誤。 (無法將“System.String”類型的 object 轉換為類型“System.Collections.Generic.IEnumerable`1[System.DateTime]”。)
---> System.InvalidCastException:無法將“System.String”類型的 object 轉換為類型“System.Collections.Generic.IEnumerable`1[System.DateTime]”。
在 Telerik.Blazor.Components.TelerikScheduler`1.CreateAppointment(TItem 數據項)
在 Telerik.Blazor.Components.TelerikScheduler`1.ExpandAppointments()
在 Telerik.Blazor.Components.TelerikScheduler`1.ProcessAppointmentsAsync()
在 Telerik.Blazor.Components.TelerikScheduler`1.OnAfterRenderAsync(布爾 firstRender)
--- 內部異常堆棧跟蹤結束 ---
不確定這方面的工作。 下面是我的代碼:
@if (HolidayPlanners != null)
{
<pre>
TelerikScheduler Data="@HolidayPlanners" @bind-Date="@StartDate" @bind-View="@selectedView" Height="100%" Class="Scheduler"
OnUpdate="@UpdateAppointment"
OnCreate="@AddAppointment"
OnDelete="@DeleteAppointment"
AllowCreate="true"
AllowDelete="true"
AllowUpdate="true"
IdField="@(nameof(UvwHolidayPlanner.Pk))"
StartField="@(nameof(UvwHolidayPlanner.StartDate))"
EndField="@(nameof(UvwHolidayPlanner.EndDate))"
TitleField="@(nameof(UvwHolidayPlanner.Title))"
DescriptionField="@(nameof(UvwHolidayPlanner.Description))"
IsAllDayField="@(nameof(UvwHolidayPlanner.IsAllDay))"
RecurrenceRuleField="@(nameof(UvwHolidayPlanner.RecurrenceRule))"
RecurrenceExceptionsField="@(nameof(UvwHolidayPlanner.RecurrenceExceptions))"
RecurrenceIdField="@(nameof(UvwHolidayPlanner.RecurrenceFk))">
SchedulerViews
SchedulerMonthView/SchedulerMonthView
/SchedulerViews
/TelerikScheduler
</pre>
}
@code {
public string _URL = String.Empty;
IEnumerable<UvwHolidayPlanner> HolidayPlanners { get; set; }
DateTime StartDate = DateTime.Now;
SchedulerView selectedView { get; set; } = SchedulerView.Month;
protected override async Task OnInitializedAsync()
{
_URL = settingsAccessor.AllClientSettings().BaseServiceURI;
HolidayPlanners = (await http.CreateClient("ClientSettings").GetFromJsonAsync<List<UvwHolidayPlanner>>($"{_URL}/api/lookup/HolidayPlanner"))
.OrderBy(t => t.Title)
.ToList();
StateHasChanged();
}
void UpdateAppointment(SchedulerUpdateEventArgs args)
{
//appointmentService.UpdateAppointment((AppointmentDto)args.Item);
}
void AddAppointment(SchedulerCreateEventArgs args)
{
//appointmentService.CreateAppointment((AppointmentDto)args.Item);
}
void DeleteAppointment(SchedulerDeleteEventArgs args)
{
//appointmentService.DeleteAppointment((AppointmentDto)args.Item);
}
}
下面是 UvwHoldidayPlanner class:
public class UvwHolidayPlanner
{
public int Pk { get; set; }
public DateTime StartDate { get; set; }
public DateTime EndDate { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public bool IsAllDay { get; set; }
public string RecurrenceRule { get; set; }
public int RecurrenceFk { get; set; }
public string RecurrenceExceptions { get; set; }
public string StartTimezone { get; set; }
public string EndTimezone { get; set; }
}
屬性public string RecurrenceExceptions { get; set; }
public string RecurrenceExceptions { get; set; }
在你的public string RecurrenceExceptions { get; set; }
class 應該是一個List<DateTime>
類型而不是一個string
。
來自 Telerik:
RecurrenceExceptions List 重復約會的例外列表。 它告訴調度程序何時跳過呈現重復約會,因為它的實例被顯式更改或移除(刪除),因此它是重復規則的例外。 另請參閱下面的注釋。
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