WPF 数据网格选择

Question

我有一个根据我的要求设计的数据网格。每个数据网格行由 7 列组成。各列的数据模板如下。

Column 1 - TextBox
Column 2 - ComboBox
Column 3 - TextBlock
Column 4 - TextBox
Column 5 - TextBox
Column 6 - TextBox
Column 7 - TextBlock

我有一个用于数据网格的 PreviewMouseLeftButtonDown 的事件处理程序，在其中我使用代码（切换选择）选择或取消选择单击的行。 我的应用程序中有一个按钮。按下此按钮时，我将数据网格的选择模式设置为 Microsoft.Windows.Controls.DataGridSelectionMode.Extended。

到目前为止一切正常。

但请考虑以下场景。

数据网格的选择模式是DataGridSelectionMode.Extended。现在我单击组合框，它的下拉菜单打开， 当我按下组合框下拉列表的滚动条时，数据网格的所有选定项目都会被取消选择。 在调用堆栈中，显示它是由于数据网格内部方法引发的事件而发生的，

HandleSelectionForCellInput(
    Microsoft.Windows.Controls.DataGridCell cell = {Microsoft.Windows.Controls.DataGridCell}, 
    bool startDragging = true, 
    bool allowsExtendSelect = true, 
    bool allowsMinimalSelect = true
) 

调用堆栈中显示的内容如下所示。

PresentationFramework.dll!System.Windows.Controls.SelectionChangedEventArgs.InvokeEventHandler(System.Delegate genericHandler, object genericTarget) + 0x31 bytes   
PresentationCore.dll!System.Windows.RoutedEventArgs.InvokeHandler(System.Delegate handler, object target) + 0x27 bytes   
PresentationCore.dll!System.Windows.RoutedEventHandlerInfo.InvokeHandler(object target, System.Windows.RoutedEventArgs routedEventArgs) + 0x3e bytes   
PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source = {Microsoft.Windows.Controls.DataGrid Items.Count:148}, System.Windows.RoutedEventArgs args = {System.Windows.Controls.SelectionChangedEventArgs}, bool reRaised = false) + 0x1bf bytes   
PresentationCore.dll!System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject sender = {Microsoft.Windows.Controls.DataGrid Items.Count:148}, System.Windows.RoutedEventArgs args = {System.Windows.Controls.SelectionChangedEventArgs}) + 0x79 bytes   
PresentationCore.dll!System.Windows.UIElement.RaiseEvent(System.Windows.RoutedEventArgs e) + 0x17 bytes   
PresentationFramework.dll!System.Windows.Controls.Primitives.Selector.OnSelectionChanged(System.Windows.Controls.SelectionChangedEventArgs e) + 0x5 bytes   
WPFToolkit.dll!Microsoft.Windows.Controls.DataGrid.OnSelectionChanged(System.Windows.Controls.SelectionChangedEventArgs e = {System.Windows.Controls.SelectionChangedEventArgs}) + 0x1ef bytes   
PresentationFramework.dll!System.Windows.Controls.Primitives.Selector.InvokeSelectionChanged(System.Collections.Generic.List<object> unselectedItems, System.Collections.Generic.List<object> selectedItems) + 0x4c bytes   
PresentationFramework.dll!System.Windows.Controls.Primitives.Selector.SelectionChanger.End() + 0xe1 bytes   
PresentationFramework.dll!System.Windows.Controls.SelectedItemCollection.EndUpdateSelectedItems() + 0x3b bytes   
PresentationFramework.dll!System.Windows.Controls.Primitives.MultiSelector.EndUpdateSelectedItems() + 0x30 bytes   
WPFToolkit.dll!Microsoft.Windows.Controls.DataGrid.MakeFullRowSelection(object dataItem = {ePlace.PackageInfo}, bool allowsExtendSelect = true, bool allowsMinimalSelect = true) + 0x85a bytes   
WPFToolkit.dll!Microsoft.Windows.Controls.DataGrid.HandleSelectionForCellInput(Microsoft.Windows.Controls.DataGridCell cell = {Microsoft.Windows.Controls.DataGridCell}, bool startDragging = true, bool allowsExtendSelect = true, bool allowsMinimalSelect = true) + 0x6b bytes   
WPFToolkit.dll!Microsoft.Windows.Controls.DataGridCell.OnAnyMouseLeftButtonDown(System.Windows.Input.MouseButtonEventArgs e = {System.Windows.Input.MouseButtonEventArgs}) + 0x155 bytes   
WPFToolkit.dll!Microsoft.Windows.Controls.DataGridCell.OnAnyMouseLeftButtonDownThunk(object sender = {Microsoft.Windows.Controls.DataGridCell}, System.Windows.Input.MouseButtonEventArgs e = {System.Windows.Input.MouseButtonEventArgs}) + 0x4f bytes   
PresentationCore.dll!System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(System.Delegate genericHandler, object genericTarget) + 0x31 bytes   
PresentationCore.dll!System.Windows.RoutedEventArgs.InvokeHandler(System.Delegate handler, object target) + 0x27 bytes   
PresentationCore.dll!System.Windows.RoutedEventHandlerInfo.InvokeHandler(object target, System.Windows.RoutedEventArgs routedEventArgs) + 0x3e bytes   
PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source = {Microsoft.Windows.Controls.DataGridCell}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, bool reRaised = true) + 0x1bf bytes   
PresentationCore.dll!System.Windows.UIElement.ReRaiseEventAs(System.Windows.DependencyObject sender = {Microsoft.Windows.Controls.DataGridCell}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, System.Windows.RoutedEvent newEvent) + 0x10a bytes   
PresentationCore.dll!System.Windows.UIElement.CrackMouseButtonEventAndReRaiseEvent(System.Windows.DependencyObject sender, System.Windows.Input.MouseButtonEventArgs e) + 0x2e bytes   
PresentationCore.dll!System.Windows.UIElement.OnMouseDownThunk(object sender, System.Windows.Input.MouseButtonEventArgs e) + 0xde bytes   
PresentationCore.dll!System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(System.Delegate genericHandler, object genericTarget) + 0x31 bytes   
PresentationCore.dll!System.Windows.RoutedEventArgs.InvokeHandler(System.Delegate handler, object target) + 0x27 bytes   
PresentationCore.dll!System.Windows.RoutedEventHandlerInfo.InvokeHandler(object target, System.Windows.RoutedEventArgs routedEventArgs) + 0x3e bytes   
PresentationCore.dll!System.Windows.EventRoute.InvokeHandlersImpl(object source = {System.Windows.Controls.TextBlock}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, bool reRaised = false) + 0x1bf bytes   
PresentationCore.dll!System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject sender = {System.Windows.Controls.TextBlock}, System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}) + 0x79 bytes   
PresentationCore.dll!System.Windows.UIElement.RaiseEvent(System.Windows.RoutedEventArgs args = {System.Windows.Input.MouseButtonEventArgs}, bool trusted) + 0x35 bytes   
PresentationCore.dll!System.Windows.Input.InputManager.ProcessStagingArea() + 0x311 bytes   
PresentationCore.dll!System.Windows.Input.InputManager.ProcessInput(System.Windows.Input.InputEventArgs input) + 0x42 bytes   
PresentationCore.dll!System.Windows.Input.InputProviderSite.ReportInput(System.Windows.Input.InputReport inputReport) + 0x62 bytes   
PresentationCore.dll!System.Windows.Interop.HwndMouseInputProvider.ReportInput(System.IntPtr hwnd, System.Windows.Input.InputMode mode, int timestamp, System.Windows.Input.RawMouseActions actions, int x, int y, int wheel) + 0x2e2 bytes   
PresentationCore.dll!System.Windows.Interop.HwndMouseInputProvider.FilterMessage(System.IntPtr hwnd = 2819506, int msg = 513, System.IntPtr wParam = 1, System.IntPtr lParam = 45155482, ref bool handled = false) + 0x4e1 bytes   
PresentationCore.dll!System.Windows.Interop.HwndSource.InputFilterMessage(System.IntPtr hwnd = 2819506, int msg = 513, System.IntPtr wParam = 1, System.IntPtr lParam = 45155482, ref bool handled = false) + 0x75 bytes   
WindowsBase.dll!MS.Win32.HwndWrapper.WndProc(System.IntPtr hwnd = 2819506, int msg = 513, System.IntPtr wParam = 1, System.IntPtr lParam = 45155482, ref bool handled = false) + 0xbe bytes   
WindowsBase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation(object o) + 0x7a bytes   
WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate callback = {Method = {System.Object DispatcherCallbackOperation(System.Object)}}, object args = {MS.Win32.HwndSubclass.DispatcherOperationCallbackParameter}, bool isSingleParameter = true) + 0x8a bytes   
WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.TryCatchWhen(object source = {System.Windows.Threading.Dispatcher}, System.Delegate callback, object args, bool isSingleParameter, System.Delegate catchHandler = null) + 0x4a bytes   
WindowsBase.dll!System.Windows.Threading.Dispatcher.WrappedInvoke(System.Delegate callback, object args, bool isSingleParameter, System.Delegate catchHandler) + 0x44 bytes   
WindowsBase.dll!System.Windows.Threading.Dispatcher.InvokeImpl(System.Windows.Threading.DispatcherPriority priority, System.TimeSpan timeout, System.Delegate method, object args, bool isSingleParameter) + 0x91 bytes   
WindowsBase.dll!System.Windows.Threading.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority priority, System.Delegate method, object arg) + 0x40 bytes   
WindowsBase.dll!MS.Win32.HwndSubclass.SubclassWndProc(System.IntPtr hwnd = 2819506, int msg = 513, System.IntPtr wParam = 1, System.IntPtr lParam = 45155482) + 0xdc bytes   
[Native to Managed Transition]   
[Managed to Native Transition]   
WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame frame = {System.Windows.Threading.DispatcherFrame}) + 0xc7 bytes   
WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame frame) + 0x49 bytes   
WindowsBase.dll!System.Windows.Threading.Dispatcher.Run() + 0x4c bytes   
PresentationFramework.dll!System.Windows.Application.RunDispatcher(object ignore) + 0x1e bytes   
PresentationFramework.dll!System.Windows.Application.RunInternal(System.Windows.Window window) + 0x6f bytes   
PresentationFramework.dll!System.Windows.Application.Run(System.Windows.Window window) + 0x26 bytes   
PresentationFramework.dll!System.Windows.Application.Run() + 0x19 bytes   
ePlace.exe!ePlace.App.Main() + 0x5e bytes    C#
[Native to Managed Transition]   
[Managed to Native Transition]   
mscorlib.dll!System.AppDomain.ExecuteAssembly(string assemblyFile, System.Security.Policy.Evidence assemblySecurity, string[] args) + 0x3a bytes   
Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() + 0x2b bytes   
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context(object state) + 0x66 bytes   
mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) + 0x6f bytes   
mscorlib.dll!System.Threading.ThreadHelper.ThreadStart() + 0x44 bytes   

现在我想避免这种从数据网格中进行选择的内部调用。有什么办法可以做到这一点吗？

Answer 1

您可以设置e.Handled = true以避免内部调用HandleSelectionForCellInput()。

这将防止在扩展模式操作中取消选择