将多个绑定值作为绑定传递CONVERTER PARAMETER

Question

我需要将两个值（可能称为“单位”和“数量”）作为转换参数传递给绑定转换器。（请注意，我不需要将这些值作为绑定值（多重绑定）传递，我需要将它们作为绑定转换器传递参数，因为我需要Convert器的Convert和ConvertBack方法）。 我认为可行的唯一方法是创建一个新类UnitQuantityBindClass，以在该类中设置它们，并将该类作为转换器参数传递，但是该类没有绑定值，当我通过转换器时，转换器参数是创建的类，没有值。 一个人可以帮我吗？

public class UnitQuantityBindClass:DependencyObject
{
    public static readonly DependencyProperty QuantityProperty = DependencyProperty.Register(
        "Quantity", typeof(EQuantities), typeof(UnitQuantityBindClass));

    public EQuantities Quantity
    {
        get { return (EQuantities)GetValue(QuantityProperty); }
        set { SetValue(QuantityProperty, value); }
    }

    public static readonly DependencyProperty UnitProperty = DependencyProperty.Register(
        "Unit", typeof(Enum), typeof(UnitQuantityBindClass));

    public Enum Unit
    {
        get { return (Enum)GetValue(UnitProperty); }
        set { SetValue(UnitProperty, value); }
    }
}

用法：

<textboxunitconvertor:TextBoxUnitConvertor Name="gasDensityValueControl" InstantaneousConvert="True" Margin="96,163,0,0" IsEnabled="{Binding ElementName=chkGas,Path=IsChecked}" QuantityBind="{Binding _FluidBlackOilClass.SGGas_SC.Quantity , RelativeSource={RelativeSource AncestorType=Window}, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"  Width="206" Height="28" HorizontalAlignment="Left" VerticalAlignment="Top">
    <textboxunitconvertor:TextBoxUnitConvertor.TextBoxText>
        <Binding Path="_FluidBlackOilClass.SGGas_SC.Value" RelativeSource="{RelativeSource AncestorType=Window}" UpdateSourceTrigger="PropertyChanged" Mode="TwoWay" Converter="{StaticResource ValueStorageForUnitConverter}">
             <Binding.ConverterParameter>
                 <classes:UnitQuantityBindClass
                     Quantity="{Binding ElementName=gasDensityValueControl,
                                Converter={StaticResource DummyConverter},
                                Path=_Quantity,
                                UpdateSourceTrigger=PropertyChanged,
                                Mode=TwoWay,
                                PresentationTraceSources.TraceLevel=High}"
                     Unit="{Binding ElementName=gasDensityValueControl,
                            Path=_CurrentUnitEnum,
                            UpdateSourceTrigger=PropertyChanged,
                            Mode=TwoWay}" />
             </Binding.ConverterParameter>
        </Binding>
    </textboxunitconvertor:TextBoxUnitConvertor.TextBoxText>
</textboxunitconvertor:TextBoxUnitConvertor>   

注意：我的要求是获取“ _FluidBlackOilClass.SGGas_SC.Value”并将其传递给转换器，并且我还需要传递“ _Quantity”和“ _CurrentUnitEnum”作为转换器参数，以根据将“ _Quantity”和“ _CurrentUnitEnum”设置为新值，并将其设置为TextBoxText。 我也需要根据“ _Quantity”和“ _CurrentUnitEnum”将TextBoxText转换回存储在“ _FluidBlackOilClass.SGGas_SC.Value”中。

Answer 1

1. 让您的Converter继承Freezable ，并引入一个称为SourceTextBox的DP，它将获取对TextBox的引用，然后在您的Convert和ConvertBack方法中，您可以使用此引用来获取所需的属性。

    public class BindableConverter : Freezable, IValueConverter { #region Overrides of Freezable protected override Freezable CreateInstanceCore() { return new BindableConverter(); } #endregion public TextBox SourceTextBox { get { return (TextBox)GetValue(SourceTextBoxProperty); } set { SetValue(SourceTextBoxProperty, value); } } // Using a DependencyProperty as the backing store for SourceTextBox. This enables animation, styling, binding, etc... public static readonly DependencyProperty SourceTextBoxProperty = DependencyProperty.Register("SourceTextBox", typeof(TextBox), typeof(BindableConverter), new PropertyMetadata(null)); public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { // ... do something with SourceTextBox here } public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { // ... do something } } 

2. 用法：

    <textboxunitconvertor:TextBoxUnitConvertor Name="gasDensityValueControl" ... > <textboxunitconvertor:TextBoxUnitConvertor.Resources> <local:BindableConverter x:Key="ValueStorageForUnitConverter" SourceTextBox="{Binding ElementName=gasDensityValueControl}"/> </textboxunitconvertor:TextBoxUnitConvertor.Resources> ... </textboxunitconvertor:TextBoxUnitConvertor>