在测试中以编程方式设置分组时如何读取 XamDataGrid 中的分组记录？

Question

我正在尝试为 XamDataGrid 编写一些测试方案。在这些情况下，我想在单个字段上设置分组。当我运行应用程序并双击网格时，此代码会导致网格按预期分组：

    Private Sub MyGrid_MouseDoubleClick(sender As Object, e As MouseButtonEventArgs) Handles MyGrid.MouseDoubleClick
        Dim xamDataGrid As XamDataGrid = CType(sender, XamDataGrid)
        Dim field As Field = xamDataGrid.FieldLayouts(0).Fields("A")
        Dim fieldSortDescription As New FieldSortDescription With {.Field = field, .Direction = ListSortDirection.Ascending, .IsGroupBy = True}

        xamDataGrid.FieldLayouts(0).SortedFields.Add(fieldSortDescription)
    End Sub

在测试中，运行在 Records 和 ViewableRecords 集合非常相似的情况下不反映分组。 xamDataGrid.ViewableRecords(0) 是 DataRecord 而不是 GroupByRecord。这是测试的代码：

    <TestMethod()>
    Public Sub Test()
        Dim xamDataGrid As New XamDataGrid

        xamDataGrid.DataSource = dataSource.DefaultView
        xamDataGrid.BeginInit()
        xamDataGrid.EndInit()

        Dim field As Field = xamDataGrid.FieldLayouts(0).Fields("A")
        Dim fieldSortDescription As New FieldSortDescription With {.Field = field, .Direction = ListSortDirection.Ascending, .IsGroupBy = True}
        xamDataGrid.FieldLayouts(0).SortedFields.Add(fieldSortDescription)

        ' exception thrown here because xamDataGrid.ViewableRecords(0) is a DataRecord
        Dim groupByRecord As GroupByRecord = CType(xamDataGrid.ViewableRecords(0), GroupByRecord)
        ' ...
    End Sub

如何刷新或以其他方式强制网格反映代码设置的分组？

感谢您的宝贵时间。

Answer 1

我很意外地发现 Records 和 ViewableRecords 集合在测试中使用 Dispatcher 刷新：

<TestMethod()>
Public Sub Test()
    Dim xamDataGrid As New XamDataGrid

    xamDataGrid.DataSource = dataSource.DefaultView
    xamDataGrid.BeginInit()
    xamDataGrid.EndInit()

    Dim field As Field = xamDataGrid.FieldLayouts(0).Fields("A")
    Dim fieldSortDescription As New FieldSortDescription With {.Field = field, .Direction = ListSortDirection.Ascending, .IsGroupBy = True}
    xamDataGrid.FieldLayouts(0).SortedFields.Add(fieldSortDescription)

    ' this line refreshes record collections
    Dispatcher.CurrentDispatcher.Invoke(New Action(Sub()
                                                   End Sub), DispatcherPriority.ContextIdle)

    ' exception not thrown!
    Dim groupByRecord As GroupByRecord = CType(xamDataGrid.ViewableRecords(0), GroupByRecord)
    ' ...
End Sub

在测试中以编程方式设置分组时如何读取 XamDataGrid 中的分组记录？

How to read grouped records in XamDataGrid when grouping is set programatically in tests?

unit-testing

grouping

infragistics

xamdatagrid