wpf - 在datagrid WPF中更改要显示的列数时，自动重置列大小

public class DataGridSetInitialColumnWidthBehavior : Behavior<DataGrid> { public int MinimumStartingColumnWidth { get => (int)GetValue(MinimumStartingColumnWidthProperty); set => SetValue(MinimumStartingColumnWidthProperty, value); } public static readonly DependencyProperty MinimumStartingColumnWidthProperty = DependencyProperty.Register("MinimumStartingColumnWidth", typeof(int), typeof(DataGridSetInitialColumnWidthBehavior), new PropertyMetadata(default(int))); public bool FillAvailableDataGridWidth { get { return (bool)GetValue(FillAvailableDataGridWidthProperty); } set { SetValue(FillAvailableDataGridWidthProperty, value); } } // Using a DependencyProperty as the backing store for FillAvailableDataGridWidth. This enables animation, styling, binding, etc... public static readonly DependencyProperty FillAvailableDataGridWidthProperty = DependencyProperty.Register("FillAvailableDataGridWidth", typeof(bool), typeof(DataGridSetInitialColumnWidthBehavior), new PropertyMetadata(default(bool))); protected override void OnAttached() { try { if (AssociatedObject == null) return; AssociatedObject.Loaded += AssociatedObject_Loaded; AssociatedObject.Unloaded += AssociatedObject_Unloaded; } catch { // ignored } } private void AssociatedObject_Loaded(object sender, RoutedEventArgs e) { if (AssociatedObject == null) return; try { if (FillAvailableDataGridWidth) SetColumnWidthsWithFill(); else SetColumnWidthsWithoutFill(); } catch { // ignored } } private void SetColumnWidthsWithoutFill() { if (AssociatedObject == null) return; try { foreach (var column in AssociatedObject.Columns) { column.Width = column.ActualWidth < MinimumStartingColumnWidth ? MinimumStartingColumnWidth : column.ActualWidth; } } catch { // ignored } } private void SetColumnWidthsWithFill() { if (AssociatedObject == null) return; try { var numVisibleColumns = AssociatedObject.Columns.Count(x => x.Visibility == Visibility.Visible); var usableDataGridWidth = (AssociatedObject.ActualWidth - AssociatedObject.RowHeaderActualWidth - AssociatedObject.BorderThickness.Left - AssociatedObject.BorderThickness.Right); var equalColumnFillWidth = 0d; var usedColumnWidth = 0d; var columnsBelowEqualFillWidth = new List<DataGridColumn>(); if (numVisibleColumns > 0) equalColumnFillWidth = usableDataGridWidth / numVisibleColumns; foreach (var column in AssociatedObject.Columns) { var currentColumnWidth = column.ActualWidth < MinimumStartingColumnWidth ? MinimumStartingColumnWidth : column.ActualWidth; column.Width = currentColumnWidth; if (column.Visibility != Visibility.Visible) continue; if (currentColumnWidth < equalColumnFillWidth) columnsBelowEqualFillWidth.Add(column); usedColumnWidth += currentColumnWidth; } if (!columnsBelowEqualFillWidth.Any()) return; var remainingDataGridWidth = usableDataGridWidth - usedColumnWidth; var spacedUsedByUndersizedColumns = 0d; foreach (var column in columnsBelowEqualFillWidth) spacedUsedByUndersizedColumns += column.ActualWidth; var newEqualColumnWidth = (remainingDataGridWidth + spacedUsedByUndersizedColumns) / columnsBelowEqualFillWidth.Count; foreach (var column in columnsBelowEqualFillWidth) column.Width = newEqualColumnWidth; } catch { // ignored } } private void AssociatedObject_Unloaded(object sender, RoutedEventArgs e) { try { Detach(); } catch { // ignored } } protected override void OnDetaching() { try { if (AssociatedObject == null) return; AssociatedObject.Loaded -= AssociatedObject_Loaded; AssociatedObject.Unloaded -= AssociatedObject_Unloaded; } catch { // ignored } } }

<UserControl.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="/NextGen.Optik.UI.Presentation;component/ProjectDataSources.xaml"/> <ResourceDictionary Source="/NextGen.Optik.UI.Presentation;component/ResourceDictionaries/Brushes.xaml"/> <ResourceDictionary Source="/NextGen.Optik.UI.Presentation;component/ResourceDictionaries/DataTemplates/InventoryMaster.xaml"/> </ResourceDictionary.MergedDictionaries> <Style x:Key="ColumnHeaderGripperStyle" TargetType="{x:Type Thumb}"> <Setter Property="Width" Value="8"/> <Setter Property="Background" Value="Transparent"/> <Setter Property="Cursor" Value="SizeWE"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Thumb}"> <Border Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}"/> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style x:Key="DataGridImageColumnHeaderStyle" TargetType="{x:Type DataGridColumnHeader}"> <Setter Property="Foreground" Value="Transparent"/> <Setter Property="VerticalContentAlignment" Value="Center"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type DataGridColumnHeader}"> <Grid> <themes:DataGridHeaderBorder BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" IsClickable="True" IsPressed="{TemplateBinding IsPressed}" IsHovered="{TemplateBinding IsMouseOver}" Padding="{TemplateBinding Padding}" SortDirection="{TemplateBinding SortDirection}" SeparatorBrush="{TemplateBinding SeparatorBrush}" SeparatorVisibility="{TemplateBinding SeparatorVisibility}"> <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/> </themes:DataGridHeaderBorder> <Thumb x:Name="PART_LeftHeaderGripper" HorizontalAlignment="Left" Style="{StaticResource ColumnHeaderGripperStyle}"/> <Thumb x:Name="PART_RightHeaderGripper" HorizontalAlignment="Right" Style="{StaticResource ColumnHeaderGripperStyle}"/> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style x:Key="DataGridImageCellStyle" TargetType="{x:Type DataGridCell}"> <Setter Property="Background" Value="Transparent"/> <Setter Property="BorderBrush" Value="Transparent"/> <Setter Property="BorderThickness" Value="1"/> <Setter Property="IsTabStop" Value="False"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type DataGridCell}"> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}" SnapsToDevicePixels="True"> <Image Source="{Binding ImageSourceFilePath}" /> </Border> </ControlTemplate> </Setter.Value> </Setter> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/> <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/> </Trigger> <Trigger Property="IsKeyboardFocusWithin" Value="True"> <Setter Property="BorderBrush" Value="{DynamicResource {x:Static DataGrid.FocusBorderBrushKey}}"/> </Trigger> <MultiTrigger> <MultiTrigger.Conditions> <Condition Property="IsSelected" Value="true"/> <Condition Property="Selector.IsSelectionActive" Value="false"/> </MultiTrigger.Conditions> <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/> <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/> <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/> </MultiTrigger> <Trigger Property="IsEnabled" Value="false"> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/> </Trigger> </Style.Triggers> </Style> <Style x:Key="DataGridRowStyle" TargetType="{x:Type DataGridRow}"> <Setter Property="Focusable" Value="True"/> <Style.Triggers> <Trigger Property="IsFocused" Value="True"> <Setter Property="IsSelected" Value="True"/> </Trigger> </Style.Triggers> </Style> <Style x:Key="DataGridTextCellStyle" TargetType="{x:Type DataGridCell}"> <Setter Property="FocusVisualStyle" Value="{x:Null}" />  <Setter Property="Background" Value="Transparent"/> <Setter Property="BorderBrush" Value="Transparent"/> <Setter Property="BorderThickness" Value="1"/> <Setter Property="IsTabStop" Value="False"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type DataGridCell}"> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True"> <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="Center" HorizontalAlignment="Left" Margin="5"/> </Border> </ControlTemplate> </Setter.Value> </Setter> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="FocusManager.FocusedElement" Value="{Binding RelativeSource={RelativeSource Self}}" />  <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/> <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/> </Trigger> <Trigger Property="IsKeyboardFocusWithin" Value="True"> <Setter Property="FocusManager.FocusedElement" Value="{Binding RelativeSource={RelativeSource Self}}" />  <Setter Property="BorderBrush" Value="{DynamicResource {x:Static DataGrid.FocusBorderBrushKey}}"/> </Trigger> <MultiTrigger> <MultiTrigger.Conditions> <Condition Property="IsSelected" Value="true"/> <Condition Property="Selector.IsSelectionActive" Value="false"/> </MultiTrigger.Conditions> <Setter Property="FocusManager.FocusedElement" Value="{Binding RelativeSource={RelativeSource Self}}" />  <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/> <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/> <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/> </MultiTrigger> <Trigger Property="IsEnabled" Value="false"> <Setter Property="FocusManager.FocusedElement" Value="{Binding RelativeSource={RelativeSource Self}}" />  <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/> </Trigger> </Style.Triggers> </Style> </ResourceDictionary> </UserControl.Resources> <Grid> <DataGrid ItemsSource="{Binding ListItems}" RowStyle="{StaticResource DataGridRowStyle}" AutoGenerateColumns="False" RowHeight="60" CanUserAddRows="False" CanUserDeleteRows="False" CanUserResizeRows="False" AlternationCount="2" HorizontalGridLinesBrush="LightSteelBlue" VerticalGridLinesBrush="LightSteelBlue" SelectionMode="Single" SelectedItem="{Binding SelectedSearchItem}" IsReadOnly="True" KeyboardNavigation.TabNavigation="Once" > <DataGrid.Background> <StaticResource ResourceKey="{x:Static SystemColors.WindowBrushKey}"/> </DataGrid.Background> <DataGrid.AlternatingRowBackground> <StaticResource ResourceKey="InventoryManagementAlternatingRowBackground"/> </DataGrid.AlternatingRowBackground> <DataGrid.Resources> <vm:DataGridColumnDisplayIndex x:Key="proxy" Data="{Binding}" /> <behaviors:DataGridSetInitialColumnWidthBehavior x:Key="pxy" FillAvailableDataGridWidth="{Binding}"/> </DataGrid.Resources> <DataGrid.Columns> <DataGridTemplateColumn Header="Image" Visibility="{Binding IsUseInventoryImage}" CellStyle="{StaticResource DataGridImageCellStyle}" HeaderStyle="{StaticResource DataGridImageColumnHeaderStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexImage, FallbackValue=0, Mode=TwoWay, Source={StaticResource proxy}}" Width="{Binding Source={StaticResource pxy}}"> <DataGridTemplateColumn.CellTemplate> <DataTemplate> <Image Source="{Binding ImageSourceFilePath}"/> </DataTemplate> </DataGridTemplateColumn.CellTemplate> </DataGridTemplateColumn> <DataGridTextColumn Header="InventoryMstrId" Visibility="Hidden" Binding="{Binding InventoryMasterId}" CellStyle="{StaticResource DataGridTextCellStyle}" /> <DataGridTextColumn Header="Manufacturer" Binding="{Binding Manufacturer}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexManufacturer, FallbackValue=1, Mode=TwoWay, Source={StaticResource proxy}}" /> <DataGridTextColumn Header="BrandId" Visibility="Hidden" Binding="{Binding BrandId}" CellStyle="{StaticResource DataGridTextCellStyle}" /> <DataGridTextColumn Header="Brand" Binding="{Binding Brand}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexBrand, FallbackValue=2, Mode=TwoWay, Source={StaticResource proxy}}" Width="{Binding Source={StaticResource pxy}}"/> <DataGridTextColumn Header="SeriesId" Visibility="Hidden" Binding="{Binding SeriesId}" CellStyle="{StaticResource DataGridTextCellStyle}" /> <DataGridTextColumn Header="Collection" Binding="{Binding Collection}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexCollection, FallbackValue=3, Mode=TwoWay, Source={StaticResource proxy}}" Width="{Binding Source={StaticResource pxy}}"/> <DataGridTextColumn Header="Description" Binding="{Binding Description}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexDescription, FallbackValue=4, Mode=TwoWay, Source={StaticResource proxy}}"/> <DataGridTextColumn Header="MaterialId" Visibility="Hidden" Binding="{Binding MaterialId}" CellStyle="{StaticResource DataGridTextCellStyle}" /> <DataGridTextColumn Header="Material" Binding="{Binding Material}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexMaterial, FallbackValue=5, Mode=TwoWay, Source={StaticResource proxy}}" /> <DataGridTextColumn Header="Color" Binding="{Binding Color}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexColor, FallbackValue=6, Mode=TwoWay, Source={StaticResource proxy}}" /> <DataGridTextColumn Header="Eye" Binding="{Binding Eye}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexEye, FallbackValue=7, Mode=TwoWay, Source={StaticResource proxy}}"/> <DataGridTextColumn Header="BridgeId" Visibility="Hidden" Binding="{Binding BridgeId}" CellStyle="{StaticResource DataGridTextCellStyle}" /> <DataGridTextColumn Header="Bridge" Binding="{Binding BridgeDescription}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexBridge, FallbackValue=8, Mode=TwoWay, Source={StaticResource proxy}}"/> <DataGridTextColumn Header="DBL" Binding="{Binding Dbl}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexDBL, FallbackValue=9, Mode=TwoWay, Source={StaticResource proxy}}"/> <DataGridTextColumn Header="Temple" Binding="{Binding Temple}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexTemple, FallbackValue=10, Mode=TwoWay, Source={StaticResource proxy}}"/> <DataGridTextColumn Header="Retail Price" Binding="{Binding RetailPrice}" CellStyle="{StaticResource DataGridTextCellStyle}" DisplayIndex="{Binding Path=Data.SetDisplayIndexRetailPrice, FallbackValue=11, Mode=TwoWay, Source={StaticResource proxy}}"/> </DataGrid.Columns> <i:Interaction.Behaviors> <behaviors:DataGridColumnVisibilityToggleBehavior DisplayColumns="{Binding DisplayColumns}" /> <behaviors:DataGridSetInitialColumnWidthBehavior MinimumStartingColumnWidth="100" FillAvailableDataGridWidth="True" /> </i:Interaction.Behaviors> </DataGrid> </Grid>