用於IEnumerable枚舉的轉換器

Question

我的組合框綁定到一個枚舉集合。我試圖從顯示中篩選出一些枚舉。

我嘗試了下面的內容，但它沒有過濾掉任何東西，它只是返回原始集合。

<telerik:GridViewComboBoxColumn Header="Occurences" 
           ItemsSource="{Binding Source={StaticResource ScheduleItems}, 
           Converter={StaticResource ScheduleItemsEnumConverter}, Mode=OneWay}" /> 

public class ScheduleItemsEnumConverter : IValueConverter 
{ 
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     var collection = ((IEnumerable<LoanCalculator.ScheduleItems>)value).Cast<LoanCalculator.ScheduleItems>(); 
     collection = 
      collection.Where(
       x => 
        !x.Equals(LoanCalculator.ScheduleItems.CapitalizedFee) || 
        !x.Equals(LoanCalculator.ScheduleItems.CapitalizedInsurance) || 
        !x.Equals(LoanCalculator.ScheduleItems.CapitalizedInterest)); 
     return collection; 
    } 

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
    { 
     throw new NotImplementedException(); 
    } 
} 

我知道where子句是可以的，因爲填充組合框的另一種方法工作得很好。

public IEnumerable<LoanCalculator.ScheduleItems> EventTypes 
{ 
    get 
    { 
     return 
      Enum.GetValues(typeof(LoanCalculator.ScheduleItems)) 
       .Cast<LoanCalculator.ScheduleItems>() 
       .Where(
        x => 
         !x.Equals(LoanCalculator.ScheduleItems.CapitalizedFee) || 
         !x.Equals(LoanCalculator.ScheduleItems.CapitalizedInsurance) || 
         !x.Equals(LoanCalculator.ScheduleItems.CapitalizedInterest)); 
    } 
} 

請問我怎樣想的轉換器應用到狀態的資源或轉換一個枚舉集

Answer 1

你的邏輯是錯誤的。你想「和」條件不「或」他們。您也不需要Cast<LoanCalculator.ScheduleItems>

public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) 
{ 
    return ((IEnumerable<LoanCalculator.ScheduleItems>)value) 
     .Where(
      x => 
       !x.Equals(LoanCalculator.ScheduleItems.CapitalizedFee) && 
       !x.Equals(LoanCalculator.ScheduleItems.CapitalizedInsurance) && 
       !x.Equals(LoanCalculator.ScheduleItems.CapitalizedInterest)); 
}