Question

我有一个Textbox，它绑定到viewmodel中的属性。我也使用转换器将十进制值转换为货币值。例如，如果我输入255，则文本值应显示为$ 255。但它似乎没有起作用。

<TextBox  Margin="479,69,0,0"
                  Height="24"
                  Text="{bindingDecorators:CurrencyBinding FleetAggregate, Mode=TwoWay, Converter={StaticResource DecimalToCurrencyConverter}}" />

虚拟机资源

public decimal? FleetAggregate
        {
            get { return FleetRatesRow.HasStandardAggregate ? (decimal?)FleetRatesRow.fleet_pa_aggregate : (decimal?)null; }
            set
            {
               if  (!value.HasValue)
                {
                    FleetRatesRow.Setfleet_pa_aggregateNull();
                    OnPropertyChanged();
                    return;
                }
                FleetRatesRow.fleet_pa_aggregate = value.Value;
                OnPropertyChanged();
            }            
        }

转换器

 public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            try
            {
                var currencyFormatArg = parameter == null ? new CurrencyFormatArg() : (CurrencyFormatArg)parameter;

                if (value == null)
                {
                    return currencyFormatArg.AllowNull ? string.Empty : DependencyProperty.UnsetValue;
                }

                var currencyValue = (decimal)value;

                string format = currencyValue < 0
                                    ? '-' + currencyFormatArg.Format
                                    : currencyFormatArg.Format;

                string codePrefix = currencyFormatArg.ShowCode ? currencyFormatArg.CurrencyCode + " " : string.Empty;
                return 
                    codePrefix +
                    string.Format(format, currencyFormatArg.CurrencySymbol, Math.Abs(currencyValue));
            }
            catch (Exception)
            {
                return DependencyProperty.UnsetValue;
            }
        }

Answer 1

您可以使用StringFormat而不是使用转换器。它还不清楚bindingDecorators:CurrencyBinding是什么。该物业本身也隐藏了很多复杂性。到目前为止还没有mcve。

无论如何decimal?应该像魅力一样：

<强> XAML

<TextBox Text="{Binding Path=FleetAggregate, StringFormat=${0:0.00}}"/>

代码背后

public class DummyViewModel
{
    private decimal? _fleetAggregate;
    public decimal? FleetAggregate
    {
        get
        {
            return _fleetAggregate;
        }
        set
        {
            _fleetAggregate = value;
            //OnPropertyChanged();
        }
    }


}

OnPropertyChanged无法使用可为空的十进制类型wpf

1 个答案: