Question

我有以下行为设置GridControl的颜色格式，如果我设置静态ColorScaleFormat，它可以正常工作。然而，我需要将它数据绑定到我的视图模型，因为色阶格式取决于模型数据。

无论如何要这样做我需要使它成为DependencyProperty，如下所示。问题是我在运行时遇到以下错误：无法在“DynamicConditionBehavior”类型的“ColorScaleFormat”属性上设置“绑定”。 '绑定'只能在DependencyObject的DependencyProperty上设置。

public void textBoxTranspo_TextChanged(object sender, EventArgs e) 
{
    if (!string.IsNullOrEmpty(textBoxTranspo.Text) && !string.IsNullOrEmpty(textBoxDaily.Text))
        textBoxTotalAmount.Text = (Convert.ToInt32(textBoxTranspo.Text) + Convert.ToInt32(textBoxDaily.Text).ToString());
}

public void textBoxDaily_TextChanged(object sender, EventArgs e)
{   
    if (!string.IsNullOrEmpty(textBoxTranspo.Text) && !string.IsNullOrEmpty(textBoxDaily.Text))
        textBoxTotalAmount.Text = (Convert.ToInt32(textBoxTranspo.Text) + Convert.ToInt32(textBoxDaily.Text).ToString());
}

我的观点模型如下：

public class DynamicConditionBehavior : Behavior<GridControl>
{
    GridControl Grid => AssociatedObject;

    protected override void OnAttached()
    {
        base.OnAttached();
        Grid.ItemsSourceChanged += OnItemsSourceChanged;
    }

    protected override void OnDetaching()
    {
        Grid.ItemsSourceChanged -= OnItemsSourceChanged;
        base.OnDetaching();
    }

    public ColorScaleFormat ColorScaleFormat {
        get { return (ColorScaleFormat) GetValue(ColorScaleFormatProperty); }
        set { SetValue(ColorScaleFormatProperty, value);}
    }
    public static ColorScaleFormat defaultColorScaleFormat = new ColorScaleFormat
    {
        ColorMin = (Color)ColorConverter.ConvertFromString("#FFF8696B"),
        ColorMiddle = (Color)ColorConverter.ConvertFromString("#FFFFEB84"),
        ColorMax = (Color)ColorConverter.ConvertFromString("#FF63BE7B")
    };

    public static readonly DependencyProperty ColorScaleFormatProperty = DependencyProperty.Register(
        "ColorScaleFormat", typeof(ColorScaleFormat), typeof(ColorScaleFormatProperty), new FrameworkPropertyMetadata(defaultColorScaleFormat));

    ....

    private void OnItemsSourceChanged(object sender, EventArgs e)
    {
        var view = Grid.View as TableView;
        if (view == null) return;

        view.FormatConditions.Clear();
        foreach (var col in Grid.Columns)
        {
            view.FormatConditions.Add(new ColorScaleFormatCondition
            {
                MinValue = 0,
                MaxValue = 20,
                FieldName = col.FieldName,
                Format = ColorScaleFormat,  
            });
        }
    }
}

和我的Table2DView XAML代码：

[POCOViewModel]
public class Table2DViewModel
{
    public DataTable ItemsTable { get; set; }
    public ColorScaleFormat ColorScaleFormat { get; set; }
    public static Table2DViewModel Create(Table2D table2D)
    {
        var factory = ViewModelSource.Factory((Table2D table) => new Table2DViewModel(table));
        return factory(table2D);
    }
}

如果我在行为中更改以下行

<dxg:GridControl ItemsSource="{Binding ItemsTable}"
             AutoGenerateColumns="AddNew"
             EnableSmartColumnsGeneration="True">
<!--DesignTimeDataObjectType="{x:Type ViewModels:RowData}"-->

    <dxmvvm:Interaction.Behaviors >
        <behaviors:DynamicConditionBehavior ColorScaleFormat="{Binding ColorScaleFormat, Mode=OneWayToSource}" />
        </dxmvvm:Interaction.Behaviors>
        <dxg:GridControl.View>
            <dxg:TableView ShowGroupPanel="False"
                       AllowPerPixelScrolling="True"/>
        </dxg:GridControl.View>
    </dxg:GridControl>

要

Format = ColorScaleFormat

从XAML删除数据绑定一切正常，但我想弄清楚如何将ColorScaleFormat数据绑定到我的ViewModel，这样我就可以通过创建属性来更改数据。

如何让我的DynamicConditionBehavior实现DependencyObject，从而允许ColorScaleFormat进行数据绑定？

编辑：我发现这个课程可能有所帮助，但我不确定在我的情况下是否需要它 http://blog.falafel.com/adding-a-dependency-property-to-a-class-that-is-not-a-dependency-object/

edit2：目前我通过创建ITable2DView接口解决了这个问题，将View的引用传递回ViewModel。 View模型然后调用一个名为SetColourFormatter的函数，并将变量传递回行为正常的行为。如果上述情况可行，我仍然很好奇。它目前看起来好像不是。

Answer 1

DP应该是行为类型

Exception in thread "main" MultiException stack 1 of 3
java.lang.IllegalArgumentException: Invalid injectee with required type of T passed to getInjecteeDescriptor
    at org.jvnet.hk2.internal.ServiceLocatorImpl.internalGetInjecteeDescriptor(ServiceLocatorImpl.java:546)
    at org.jvnet.hk2.internal.ServiceLocatorImpl.getInjecteeDescriptor(ServiceLocatorImpl.java:585)
    at org.jvnet.hk2.internal.ThreeThirtyResolver.resolve(ThreeThirtyResolver.java:70)
    at org.jvnet.hk2.internal.ClazzCreator.resolve(ClazzCreator.java:211)
    at org.jvnet.hk2.internal.ClazzCreator.resolveAllDependencies(ClazzCreator.java:228)
    at org.jvnet.hk2.internal.ClazzCreator.create(ClazzCreator.java:357)
    at org.jvnet.hk2.internal.SystemDescriptor.create(SystemDescriptor.java:471)
    at org.jvnet.hk2.internal.PerLookupContext.findOrCreate(PerLookupContext.java:70)
    at org.jvnet.hk2.internal.Utilities.createService(Utilities.java:2020)
    at org.jvnet.hk2.internal.ServiceLocatorImpl.internalGetService(ServiceLocatorImpl.java:766)
    at org.jvnet.hk2.internal.ServiceLocatorImpl.getService(ServiceLocatorImpl.java:713)
    at com.github.fabriziocucci.test.Test.main(Test.java:39)
MultiException stack 2 of 3
java.lang.IllegalArgumentException: While attempting to resolve the dependencies of com.github.fabriziocucci.test.Test$A errors were found
    at org.jvnet.hk2.internal.ClazzCreator.resolveAllDependencies(ClazzCreator.java:246)
    at org.jvnet.hk2.internal.ClazzCreator.create(ClazzCreator.java:357)
    at org.jvnet.hk2.internal.SystemDescriptor.create(SystemDescriptor.java:471)
    at org.jvnet.hk2.internal.PerLookupContext.findOrCreate(PerLookupContext.java:70)
    at org.jvnet.hk2.internal.Utilities.createService(Utilities.java:2020)
    at org.jvnet.hk2.internal.ServiceLocatorImpl.internalGetService(ServiceLocatorImpl.java:766)
    at org.jvnet.hk2.internal.ServiceLocatorImpl.getService(ServiceLocatorImpl.java:713)
    at com.github.fabriziocucci.test.Test.main(Test.java:39)
MultiException stack 3 of 3
java.lang.IllegalStateException: Unable to perform operation: resolve on com.github.fabriziocucci.test.Test$A
    at org.jvnet.hk2.internal.ClazzCreator.create(ClazzCreator.java:386)
    at org.jvnet.hk2.internal.SystemDescriptor.create(SystemDescriptor.java:471)
    at org.jvnet.hk2.internal.PerLookupContext.findOrCreate(PerLookupContext.java:70)
    at org.jvnet.hk2.internal.Utilities.createService(Utilities.java:2020)
    at org.jvnet.hk2.internal.ServiceLocatorImpl.internalGetService(ServiceLocatorImpl.java:766)
    at org.jvnet.hk2.internal.ServiceLocatorImpl.getService(ServiceLocatorImpl.java:713)
    at com.github.fabriziocucci.test.Test.main(Test.java:39)

将依赖项属性添加到WPF行为

1 个答案: