如何为样式指定设计器数据上下文，以便 Resharper 找到我的属性? [英] How can i specify a designer datacontext for a style, so Resharper finds my properties?

问题描述

我经常将 TreeViewItem 的 IsExpanded 和 IsSelected 属性绑定到我的视图模型.例如，这使得可以在加载树时预先展开项目或在选择项目时展开项目.

I often bind the IsExpanded and IsSelected properties of a TreeViewItem to my viewmodel. This for example makes it possible to make an item pre-expanded when the tree is loaded or expand an item when it gets selected.

XAML 如下所示:

<Window x:Class="StyleSetterDatatypeTest.MainWindow"
            xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
            xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
            xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
            xmlns:test="clr-namespace:StyleSetterDatatypeTest"
            Title="MainWindow" Height="350" Width="525"
            mc:Ignorable="d"
            d:DataContext="{d:DesignInstance test:TestViewModel, IsDesignTimeCreatable=True}">

    <TreeView ItemsSource="{Binding Items}">
        <TreeView.Resources>
            <Style TargetType="TreeViewItem">
                <Setter Property="IsExpanded" Value="{Binding ItemExpanded}"/>
                <Setter Property="IsSelected" Value="{Binding ItemSelected}"/>
            </Style>

            <HierarchicalDataTemplate DataType="{x:Type test:TestItemViewModel}" ItemsSource="{Binding Children}">
                <TextBlock Text="{Binding Name}"/>
            </HierarchicalDataTemplate>
        </TreeView.Resources>
    </TreeView>
</Window>

我的视图模型可能如下所示:

And my viewmodel could look like this:

public class TestItemViewModel
{
    public bool ItemExpanded { get; set; }

    public bool ItemSelected { get; set; }

    public string Name { get; set; }

    public string[] Children
    {
        get { return new [] {"Child 1", "Child 2"}; }
    }
}

这在执行和设计器中运行良好，但 Resharper 没有在 Bindings 中找到 ItemSelected 和 ItemExpanded 属性，并将它们加下划线作为警告.
我可以理解为什么它找不到它们(我从未将TestViewModel"指定为 Style 的 Datacontext 类型)，但是我该如何解决这个问题?没有样式-设计-数据上下文这样的东西...

This works fine in execution and designer, but Resharper does not find the ItemSelected and ItemExpanded properties in the Bindings and underlines them as a warning.
I can understand why it doesn't find them (i never specified "TestViewModel" as the Datacontext type for the Style), but how can i fix this? There is no such thing as a Style-Design-Datacontext...

更新:

这里的问题是，样式是在 TreeView 中定义的，并且 DataContext 明确设置为 TestViewModel.检查器没有得到，我的样式是 TreeViewItem 并且该项目具有 TestItemViewModel 的 DataContext(ItemsSource 元素的类型).

The problem here is, the style is defined in the TreeView and there the DataContext is clearly set to a TestViewModel. The checker doesn't get, that what I style is a TreeViewItem and this item has a DataContext of TestItemViewModel (Type of an ItemsSource element).

哦，我还尝试在 TreeView.ItemContainerStyle 中设置样式而不是 TreeView.Resources(这里应该清楚 DataContext 必须是 TextItemViewModel)，但这不会改变任何东西...

Oh, and I also tried setting the style in TreeView.ItemContainerStyle instead if TreeView.Resources (here it should be clear the DataContext has to be a TextItemViewModel), but that doesn't change anything...

推荐答案

@lhildebrandt 的回答通常是正确的，但在我的情况下，此解决方案产生的错误完全禁止在设计器中显示视图.指定 inside