System.Windows.Data错误：4（每行） [英] System.Windows.Data Error: 4 (for every row)

问题描述

我的自定义数据网格类（每当使用时）每次加载一行时都会抛出此错误。 它是无害的，我倾向于忽略它，但我现在想要摆脱它。

My custom data grid class (whenever used) has been throwing this error everytime it loads a row.  It's been harmless and I tend to ignore it, but I now want to get rid of it.

System.Windows.Data错误：4：无法找到与引用'RelativeSource FindAncestor绑定的源代码，AncestorType ='System.Windows.Controls.DataGrid'，AncestorLevel ='1''。 BindingExpression：路径= AreRowDetailsFrozen;的DataItem = NULL; target元素是'DataGridDetailsPresenter'
（Name =''）; target属性是'SelectiveScrollingOrientation'（类型'SelectiveScrollingOrientation'）

System.Windows.Data错误：4：找不到用于绑定的源'RelativeSource FindAncestor，AncestorType ='System.Windows.Controls.DataGrid '，AncestorLevel ='1''。 BindingExpression：路径= HeadersVisibility;的DataItem = NULL; target元素是'DataGridRowHeader'
（Name =''）; target属性是'Visibility'（类型'Visibility'）

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.DataGrid', AncestorLevel='1''. BindingExpression:Path=AreRowDetailsFrozen; DataItem=null; target element is 'DataGridDetailsPresenter' (Name=''); target property is 'SelectiveScrollingOrientation' (type 'SelectiveScrollingOrientation')
System.Windows.Data Error: 4 : Cannot find source for binding with reference 'RelativeSource FindAncestor, AncestorType='System.Windows.Controls.DataGrid', AncestorLevel='1''. BindingExpression:Path=HeadersVisibility; DataItem=null; target element is 'DataGridRowHeader' (Name=''); target property is 'Visibility' (type 'Visibility')

我没有任何代码或xaml标记尝试创建或修改AreRowDetailsFrozen或HeadersVisibility的任何绑定，我知道 或者就此而言，DataGridDetailsPresentor和DataGridRowHeader。

I don't have any code or xaml markup attempting to create or modify any bindings to AreRowDetailsFrozen or HeadersVisibility, that I am aware of.  Or for that matter, DataGridDetailsPresentor, and DataGridRowHeader.

这是datagrid的定义代码：

Here is the definition code for the datagrid:

Imports System.Windows.Controls.Primitives
Imports System.Data
Imports System.ComponentModel
Imports System.Reflection
Imports System.Windows.Controls
Imports System.Windows
Imports System.Windows.Data
Imports System.Windows.Input
Imports System.Windows.Media

Public Class ccMasterDataGrid
    Inherits DataGrid

#Region "Properties"

    Public WithEvents miSearch As MenuItem
    Public WithEvents miGroup As MenuItem
    Public WithEvents miUnFilter As MenuItem
    Public WithEvents miQuickFilter As MenuItem
    Public WithEvents miAddNew As MenuItem
    Public WithEvents miCopyClip As MenuItem
    Public WithEvents miUnsort As MenuItem
    Public WithEvents miDelete As MenuItem
    Public WithEvents ScrollViewer As ScrollViewer

    Public FilterColumns As New List(Of DataColumn)
    Public sortColumns As New List(Of DataColumn)
    Public groupColumns As New List(Of DataColumn)
    Private WithEvents mLCV As ListCollectionView = Nothing

    Public Property LCV As ListCollectionView
        Get
            mLCV = LoadLCV()
            Return mLCV
        End Get
        Set(ByVal value As ListCollectionView)
            mLCV = value
        End Set
    End Property

    Dim sortComp As New RowComparer
    Public Event AddNew()
    Public Event UserDelete(ByRef rows As List(Of Object))
    Public Event RowGotFocus(row As DataGridRow)
    Public Event RowLostFocus(row As DataGridRow)
    Public Event VerticalScrollChanged(sender As Object, e As ScrollChangedEventArgs)
    Public Event FilterModified(IsFiltered As Boolean)
    Public Event RowsFiltered()
    Public Event RowsSorted()

    Private WithEvents dt As DataTable

    Private isManualEditCommit As Boolean
    Private isSettingGroups As Boolean
    Public groupItemsExpanders As Dictionary(Of Object, Boolean)

#End Region

#Region "Load/Save"

    Shared Sub New()

    End Sub

    Protected Overrides Sub OnInitialized(ByVal e As System.EventArgs)
        MyBase.OnInitialized(e)
        Name = "dgMaster"
        AutoGenerateColumns = False
        EnableRowVirtualization = True
        Style = CType(Application.Current.FindResource("StandardDataGrid"), Style)
        'set group style:
        Dim datagridRowsPresenter As New FrameworkElementFactory(GetType(Primitives.DataGridRowsPresenter))
        Dim itemsPanelTemplate As New ItemsPanelTemplate With {.VisualTree = datagridRowsPresenter}
        Dim gStyle As New GroupStyle() With {.Panel = itemsPanelTemplate}
        Me.GroupStyle.Add(gStyle)
        gStyle.ContainerStyle = TryCast(Application.Current.FindResource("StandardGroupItem"), Style)

        Me.ContextMenu = New ContextMenu
        Me.ContextMenu.Items.Add(New MenuItem())
        Me.ContextMenu.Items.Add(New MenuItem())
        Me.ContextMenu.Items.Add(New MenuItem())
        Me.ContextMenu.Items.Add(New MenuItem())
        Me.ContextMenu.Items.Add(New MenuItem())
        Me.ContextMenu.Items.Add(New MenuItem())
        Me.ContextMenu.Items.Add(New MenuItem())
        Me.ContextMenu.Items.Add(New MenuItem())
        miSearch = Me.ContextMenu.Items(0)
        miQuickFilter = Me.ContextMenu.Items(1)
        miUnFilter = Me.ContextMenu.Items(2)
        miUnsort = Me.ContextMenu.Items(3)
        miGroup = Me.ContextMenu.Items(4)
        miAddNew = Me.ContextMenu.Items(5)
        miCopyClip = Me.ContextMenu.Items(6)
        miDelete = Me.ContextMenu.Items(7)
        miSearch.Style = CType(Application.Current.FindResource("SearchMenuItem"), Style)
        miUnFilter.Style = CType(Application.Current.FindResource("UnFilterMenuItem"), Style)
        miGroup.Style = CType(Application.Current.FindResource("GroupByMenuItem"), Style)
        miQuickFilter.Style = CType(Application.Current.FindResource("QuickFilterMenuItem"), Style)
        miAddNew.Style = CType(Application.Current.FindResource("AddNewMenuItem"), Style)
        miCopyClip.Style = CType(Application.Current.FindResource("CopyClipMenuItem"), Style)
        miUnsort.Style = CType(Application.Current.FindResource("UnSortMenuItem"), Style)
        miDelete.Style = CType(Application.Current.FindResource("DeleteMenuItem"), Style)
        Me.CanUserDeleteRows = False
    End Sub

    Public Overridable Sub dgMaster_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded
        Try
            If Not (System.ComponentModel.DesignerProperties.GetIsInDesignMode(Me)) Then
                LoadColumnsNames()
                If Me.IsReadOnly Then
                    ContextMenu.Items.Remove(miAddNew)
                    ContextMenu.Items.Remove(miDelete)
                End If
            End If
            ScrollViewer = GetScrollViewer(Me)
        Catch ex As Exception
            Dim eh As New ErrorHandler(ex)
            eh.HandleIt()
        End Try
    End Sub

    Public Function LoadLCV() As ListCollectionView
        Dim newLCV As ListCollectionView = GetListCollectionView()
        If newLCV IsNot Nothing Then
            If TypeOf newLCV.SourceCollection Is DataView Then
                Dim dv As DataView = newLCV.SourceCollection
                dt = dv.Table
            End If
        End If
        Return newLCV
    End Function

    Private Function GetListCollectionView() As ListCollectionView
        If TypeOf CollectionViewSource.GetDefaultView(ItemsSource) Is ListCollectionView Then
            Return DirectCast(CollectionViewSource.GetDefaultView(ItemsSource), ListCollectionView)
        End If
        Return Nothing
    End Function

    Public Sub LoadColumnsNames()
        LoadDataGridGroupMenu()
        For Each mi As MenuItem In miGroup.Items
            AddHandler mi.Checked, AddressOf miGroup_Click
            AddHandler mi.Unchecked, AddressOf miGroup_Click
        Next
    End Sub

    Public Sub LoadDataGridGroupMenu()
        FilterColumns = New List(Of DataColumn)
        For Each column As DataGridColumn In Columns
            If FilterColumns.Find(Function(x) x.Column Is column) Is Nothing Then
                FilterColumns.Add(New DataColumn(column))
            End If
        Next
        For Each gc As DataColumn In FilterColumns
            Dim strcolumn As String = gc.Column.Header
            If strcolumn <> String.Empty Then
                Dim mi As New MenuItem
                mi.Header = strcolumn
                mi.IsCheckable = True
                mi.IsChecked = False
                Dim booFound As Boolean = False
                For Each miEx As MenuItem In miGroup.Items
                    If miEx.Header = mi.Header Then
                        booFound = True
                    End If
                Next
                If booFound = False Then miGroup.Items.Add(mi)
            End If
        Next
    End Sub

以下是数据网格的样式：

here are the styles for the data grid:

    <Style x:Key="DataGridStandardCell" BasedOn="{StaticResource StandardFont}" TargetType="{x:Type DataGridCell}">
            <Setter Property="Focusable" Value="True"/>
            <Setter Property="FocusVisualStyle">
                <Setter.Value>
                    <Style TargetType="Control">
                        <Setter Property="Background"  Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                        <Setter Property="FontWeight" Value="ExtraBold"/>
                    </Style>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="Background"  Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                    <Setter Property="FontWeight" Value="ExtraBold"/>
                </Trigger>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Background"  Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                    <Setter Property="FontWeight" Value="ExtraBold"/>
                </Trigger>
            </Style.Triggers>
        </Style>

        <Style x:Key="DataGridCellRight" BasedOn="{StaticResource DataGridStandardCell}" TargetType="{x:Type DataGridCell}">
            <Setter Property="TextBlock.TextAlignment" Value="Right" />
        </Style>
        <Style x:Key="DataGridCellCenter" BasedOn="{StaticResource DataGridStandardCell}" TargetType="{x:Type DataGridCell}">
            <Setter Property="TextBlock.TextAlignment" Value="Center" />
        </Style>
        <Style x:Key="DataGridCellLeft" BasedOn="{StaticResource DataGridStandardCell}" TargetType="{x:Type DataGridCell}">
            <Setter Property="TextBlock.TextAlignment" Value="Left" />
        </Style>
        <Style x:Key="StandardDataGrid" BasedOn="{StaticResource StandardFont}" TargetType="{x:Type DataGrid}">
            <Setter Property="CellStyle" Value="{StaticResource DataGridCellLeft}"/>
            <Setter Property="AlternatingRowBackground" Value="#FFF0F0F0"/>
            <Setter Property="Margin" Value="0" />
            <Setter Property="VirtualizingPanel.IsVirtualizingWhenGrouping" Value="True"/>
            <Style.Resources>
                <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="#64007A33" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlBrushKey}" Color="Transparent" />
                <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey}" Color="Black" />
                <SolidColorBrush x:Key="{x:Static SystemColors.ControlTextBrushKey}" Color="Black" />
            </Style.Resources>
        </Style>
        <Style  TargetType="{x:Type DataGridRow}">
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Setter Property="Background"  Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                    <Setter Property="FontWeight" Value="ExtraBold"/>
                </Trigger>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Background"  Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                    <Setter Property="FontWeight" Value="ExtraBold"/>
                </Trigger>
            </Style.Triggers>
            <Setter Property="Focusable" Value="True"/>
            <Setter Property="FocusVisualStyle">
                <Setter.Value>
                    <Style TargetType="Control">
                        <Setter Property="Background"  Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                        <Setter Property="FontWeight" Value="ExtraBold"/>
                    </Style>
                </Setter.Value>
            </Setter>
        </Style>
        <Style x:Key="FocusedDataGridRow" TargetType="{x:Type DataGridRow}">
            <Setter Property="Background"  Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
            <Setter Property="FontWeight" Value="ExtraBold"/>
        </Style>
        <Style x:Key="DataGridCellDatePicker" BasedOn="{StaticResource StandardFont}" TargetType="{x:Type DatePicker}" >
            <Setter Property="Margin" Value="0"/>
            <Setter Property="Padding" Value="1"/>
            <Setter Property="BorderThickness" Value="0"/>
        </Style>
        <Style x:Key="StandardGroupItem" TargetType="{x:Type GroupItem}">
            <Setter Property="Margin" Value="0,0,0,0"/>
            <Setter Property="MinHeight" Value="0"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type GroupItem}">
                        <Expander Name="part_Expander" Background="#87007000" BorderBrush="#C5003800" Foreground="Black" BorderThickness="1,1,1,1" Margin="3" Padding="1" MinHeight="0" >
                            <!--IsExpanded="{Binding Path=ExpandGroups, RelativeSource={RelativeSource AncestorType=TTSMain:ccMasterDataGrid}}"-->
                            <Expander.Header>
                                <DockPanel>
                                    <TextBlock Style="{StaticResource StandardFont}" FontWeight="Bold" Text="{Binding Path=ItemCount}" Width="Auto"/>
                                    <TextBlock Style="{StaticResource StandardFont}" FontWeight="Bold" Text=" : " Width="Auto"/>
                                    <TextBlock Style="{StaticResource StandardFont}" FontWeight="Bold" Text="{Binding Path=Name}" Width="Auto"/>
                                </DockPanel>
                            </Expander.Header>
                            <Expander.Content>
                                <ItemsPresenter />
                            </Expander.Content>
                        </Expander>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

任何线索？

Any clues?

jvj

推荐答案

嗨Jamie，

Hi Jamie,

请您分享完整的代码，这可以重现我们这边的问题。 

Could you please share a complete code, which could reproduce the issue on our side. 

此外，您可以查看以下博客，这些博客提供了两种解决问题的解决方案。

In addition, you could check the following blogs, which provide two solution to resolve the issue.

https://weblogs.asp.net/akjoshi/resolving-un-harmful-binding-errors-in-wpf

祝你好运，

张龙

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