DataGrid 或 GridView CellTemplate 中的动态内容
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【中文标题】DataGrid 或 GridView CellTemplate 中的动态内容【英文标题】：Dynamic content in DataGrid or GridView CellTemplate 【发布时间】：2021-03-23 16:07:38 【问题描述】：我正在尝试使用DataGrid 实现一个视图，以显示来自控制器的实时数据，并有可能允许将列表中的控件的数据写回控制器。应根据数据信号的数据类型动态选择控件。在我目前的方法中，如果数据类型是布尔值，我使用按钮，否则单元格中的控件应该是滑块。
问题是每个不同的控件我只能得到一个可见的实例。
我尝试使用 DataGrid 控件和带有 GridView 的 ListView，正如您在 2 个选项卡中看到的那样：
如果我在GridView 上单击两次，控件将在所选行中可见，并在另一行中消失。在ListView 中，如果我单击任何没有可见控件的单元格，则不会发生任何事情。
我在这个例子中使用了Material Design In XAML Toolkit，但没有添加它我得到了相同的结果。
我想我无法在视图中使用CellTemplate，但我希望有办法让它工作。
代码：
MainWindow.xaml
<Window x:Class="ListContentControlTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:ListContentControlTest"
xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
TextElement.Foreground="DynamicResource MaterialDesignBody"
TextElement.FontWeight="Regular"
TextElement.FontSize="13"
TextOptions.TextFormattingMode="Ideal"
TextOptions.TextRenderingMode="Auto"
Background="DynamicResource MaterialDesignPaper"
FontFamily="materialDesign:MaterialDesignFont"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid VerticalAlignment="Stretch" HorizontalAlignment='Stretch'>
<TabControl>
<TabItem Header="ListView">
<ListView ItemsSource="Binding DataSignalsList">
<ListView.View>
<GridView>
<GridViewColumn Header="Name" DisplayMemberBinding="Binding Name" Width="200" />
<GridViewColumn Header="Address" DisplayMemberBinding="Binding Address" Width="200" />
<GridViewColumn Header="Read" DisplayMemberBinding="Binding Value" Width="100" />
<GridViewColumn Header="Write">
<GridViewColumn.CellTemplate>
<DataTemplate>
<ContentControl>
<ContentControl.Style>
<Style TargetType="ContentControl">
<Style.Triggers>
<DataTrigger Binding="Binding IsDataTypeBool" Value="true">
<Setter Property="Content">
<Setter.Value>
<Button Content="Click Me" FontSize="10" Height="18"/>
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger Binding="Binding IsDataTypeBool" Value="false">
<Setter Property="Content">
<Setter.Value>
<StackPanel Orientation="Horizontal">
<TextBlock Text="0" Margin="10 5 10 5"/>
<Slider Value="50" Minimum="0" Maximum="100" MinWidth="150"/>
<TextBlock Text="100" Margin="10 5 10 5"/>
</StackPanel>
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
</TabItem>
<TabItem Header="GridView">
<DataGrid
ItemsSource="Binding DataSignalsList"
CanUserSortColumns="True"
CanUserResizeRows="False"
CanUserAddRows="False"
AutoGenerateColumns="False"
HeadersVisibility="All" >
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="Binding Name" />
<DataGridTextColumn Header="Address" Binding="Binding Address" />
<DataGridTextColumn CanUserSort="False" CanUserReorder="False" Header="Read" Binding="Binding Value"/>
<DataGridTemplateColumn Header="Write" MinWidth="250">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ContentControl>
<ContentControl.Style>
<Style TargetType="ContentControl">
<Style.Triggers>
<DataTrigger Binding="Binding IsDataTypeBool" Value="true">
<Setter Property="Content">
<Setter.Value>
<StackPanel Orientation="Horizontal" Margin="5">
<Button Content="Click Me" FontSize="10" Height="18"/>
</StackPanel>
</Setter.Value>
</Setter>
</DataTrigger>
<DataTrigger Binding="Binding IsDataTypeBool" Value="false">
<Setter Property="Content">
<Setter.Value>
<StackPanel Orientation="Horizontal">
<TextBlock Text="0" Margin="10 5 10 5"/>
<Slider Value="50" Minimum="0" Maximum="100" MinWidth="150"/>
<TextBlock Text="100" Margin="10 5 10 5"/>
</StackPanel>
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
</TabItem>
</TabControl>
</Grid>
</Window>
MainWindow.xaml.cs
using System.Windows;
namespace ListContentControlTest
public partial class MainWindow : Window
public MainWindow()
InitializeComponent();
MainWindowViewModel.cs
using ListContentControlTest.Models;
using System.Collections.Generic;
namespace ListContentControlTest.ViewModels
public class MainWindowViewModel
private IList<DataSignalModel> _dataSignalsList;
public MainWindowViewModel()
DataSignalsList = new List<DataSignalModel>
new DataSignalModelName = "Data Signal 0", Address = "Float Data Type Address", DataType = DataType.Float,
new DataSignalModelName = "Data Signal 1", Address = "Bool Data Type Address", DataType = DataType.Bool,
new DataSignalModelName = "Data Signal 2", Address = "Bool Data Type Address", DataType = DataType.Bool,
new DataSignalModelName = "Data Signal 3", Address = "Bool Data Type Address", DataType = DataType.Bool,
new DataSignalModelName = "Data Signal 4", Address = "Bool Data Type Address", DataType = DataType.Bool,
new DataSignalModelName = "Data Signal 5", Address = "Float Data Type Address", DataType = DataType.Float,
new DataSignalModelName = "Data Signal 6", Address = "Float Data Type Address", DataType = DataType.Float,
new DataSignalModelName = "Data Signal 7", Address = "Bool Data Type Address", DataType = DataType.Bool,
new DataSignalModelName = "Data Signal 8", Address = "Bool Data Type Address", DataType = DataType.Bool,
new DataSignalModelName = "Data Signal 9", Address = "Bool Data Type Address", DataType = DataType.Bool
;
public IList<DataSignalModel> DataSignalsList
get return _dataSignalsList;
set _dataSignalsList = value;
DataSignalModel.cs
using System.ComponentModel;
namespace ListContentControlTest.Models
public enum DataType
Bool,
Int,
Float
public class DataSignalModel : INotifyPropertyChanged
bool _isDataTypeBool;
private DataType _dataType;
public string Name get; set;
public DataType DataType
get => _dataType;
set
_dataType = value;
if (_dataType == DataType.Bool)
IsDataTypeBool = true;
else
IsDataTypeBool = false;
OnPropertyChanged(nameof(DataType));
OnPropertyChanged(nameof(IsDataTypeBool));
public string Address get; set;
public double Value get; set;
public bool IsDataTypeBool
get => _isDataTypeBool;
set
_isDataTypeBool = value;
OnPropertyChanged(nameof(IsDataTypeBool));
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string propName)
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propName));
App.xaml
<Application x:Class="ListContentControlTest.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:ListContentControlTest">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Light.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignThemes.Wpf;component/Themes/MaterialDesignTheme.Defaults.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Primary/MaterialDesignColor.LightBlue.xaml" />
<ResourceDictionary Source="pack://application:,,,/MaterialDesignColors;component/Themes/Recommended/Accent/MaterialDesignColor.Purple.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
App.xaml.cs
using System.Windows;
using ListContentControlTest.ViewModels;
namespace ListContentControlTest
public partial class App : Application
protected override void OnStartup(StartupEventArgs e)
base.OnStartup(e);
MainWindow window = new MainWindow();
MainWindowViewModel mwvm = new MainWindowViewModel();
window.DataContext = mwvm;
window.Show();
【问题讨论】：
您是否遇到了 DataTriggers 不读取初始值的问题？尝试谷歌搜索 wpf datatriggeronload。 【参考方案1】：您看到的行为是由您创建数据模板的方式引起的。 ContentControl 内部为每个单元格实例化，但样式设置器内部的控件没有。这意味着按钮和滑块的单个实例在所有单元格之间共享。由于 WPF 中的控件只能有一个父级 - 或者换句话说，它只能在可视化树中出现一次 - 它只能在单元格之间重新分配或移动。
为了解决问题，不要在样式中创建控件，而是在数据模板中创建控件，例如：
<!-- Data template for "Bool" -->
<DataTemplate x:Key="DataSignalModelBoolTemplate" DataType="x:Type local:DataSignalModel">
<StackPanel Orientation="Horizontal" Margin="5">
<Button Content="Click Me" FontSize="10" Height="18"/>
</StackPanel>
</DataTemplate>
<!-- Data template for both "Int" and "Float", hence "Numeric" -->
<DataTemplate x:Key="DataSignalModelNumericTemplate" DataType="x:Type local:DataSignalModel">
<StackPanel Orientation="Horizontal">
<TextBlock Text="0" Margin="10 5 10 5"/>
<Slider Value="50" Minimum="0" Maximum="100" MinWidth="150"/>
<TextBlock Text="100" Margin="10 5 10 5"/>
</StackPanel>
</DataTemplate>
当您存储一个数据类型成员而不是创建两个不同的模型类型时，您必须创建一个自定义 DataTemplateSelector 以根据 DataType 选择数据模板。
public class DataSignalModelTemplateSelector : DataTemplateSelector
public override DataTemplate SelectTemplate(object item, DependencyObject container)
if (!(item is DataSignalModel dataSignalModel) || !(container is FrameworkElement containerFrameworkElement))
return null;
switch (dataSignalModel.DataType)
case DataType.Bool:
return FindDataTemplate(containerFrameworkElement, "DataSignalModelBoolTemplate");
case DataType.Int:
case DataType.Float:
return FindDataTemplate(containerFrameworkElement, "DataSignalModelNumericTemplate");
default:
throw new ArgumentOutOfRangeException();
private static DataTemplate FindDataTemplate(FrameworkElement frameworkElement, string key)
return (DataTemplate)frameworkElement.FindResource(key);
在资源字典中创建此转换器的实例，您也可以在其中存储数据模板。
<local:DataSignalModelTemplateSelector x:Key="DataSignalModelTemplateSelector"/>
然后，像这样调整ListView 和DataGrid 中的列定义：
<GridViewColumn Header="Write" CellTemplateSelector="StaticResource DataSignalModelTemplateSelector"/>
<DataGridTemplateColumn Header="Write" MinWidth="250" CellTemplateSelector="StaticResource DataSignalModelTemplateSelector"/>
就是这样。数据模板选择器将自动确定适当的模板并在资源中搜索它。您可以从DataSignalModel 中删除IsDataTypeBool，因为它不是必需的。
为方便起见，这里是您的MainWindow 的完整标记：
<Window x:Class="ListContentControlTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:ListContentControlTest"
xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
TextElement.Foreground="DynamicResource MaterialDesignBody"
TextElement.FontWeight="Regular"
TextElement.FontSize="13"
TextOptions.TextFormattingMode="Ideal"
TextOptions.TextRenderingMode="Auto"
Background="DynamicResource MaterialDesignPaper"
FontFamily="materialDesign:MaterialDesignFont"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Window.Resources>
<local:DataSignalModelTemplateSelector x:Key="DataSignalModelTemplateSelector"/>
<DataTemplate x:Key="DataSignalModelBoolTemplate" DataType="x:Type local:DataSignalModel">
<StackPanel Orientation="Horizontal" Margin="5">
<Button Content="Click Me" FontSize="10" Height="18"/>
</StackPanel>
</DataTemplate>
<DataTemplate x:Key="DataSignalModelNumericTemplate" DataType="x:Type local:DataSignalModel">
<StackPanel Orientation="Horizontal">
<TextBlock Text="0" Margin="10 5 10 5"/>
<Slider Value="50" Minimum="0" Maximum="100" MinWidth="150"/>
<TextBlock Text="100" Margin="10 5 10 5"/>
</StackPanel>
</DataTemplate>
</Window.Resources>
<Grid VerticalAlignment="Stretch" HorizontalAlignment='Stretch'>
<TabControl>
<TabItem Header="ListView">
<ListView ItemsSource="Binding DataSignalsList">
<ListView.View>
<GridView>
<GridViewColumn Header="Name" DisplayMemberBinding="Binding Name" Width="200" />
<GridViewColumn Header="Address" DisplayMemberBinding="Binding Address" Width="200" />
<GridViewColumn Header="Read" DisplayMemberBinding="Binding Value" Width="100" />
<GridViewColumn Header="Write" CellTemplateSelector="StaticResource DataSignalModelTemplateSelector"/>
</GridView>
</ListView.View>
</ListView>
</TabItem>
<TabItem Header="GridView">
<DataGrid
ItemsSource="Binding DataSignalsList"
CanUserSortColumns="True"
CanUserResizeRows="False"
CanUserAddRows="False"
AutoGenerateColumns="False"
HeadersVisibility="All" >
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="Binding Name" />
<DataGridTextColumn Header="Address" Binding="Binding Address" />
<DataGridTextColumn CanUserSort="False" CanUserReorder="False" Header="Read" Binding="Binding Value"/>
<DataGridTemplateColumn Header="Write" MinWidth="250" CellTemplateSelector="StaticResource DataSignalModelTemplateSelector"/>
</DataGrid.Columns>
</DataGrid>
</TabItem>
</TabControl>
</Grid>
</Window>
关于数据类型的说明：您在DataSignalModel 中保留一个成员DataType 以确定其类型。通常你会为每个数据创建专门的类型，而不是一个单一的模型，例如：
BoolDataSignalModel
IntDataSignalModel
FloatDataSignalModel
从设计的角度来看，这也有利于分离关注点。这些类型还可能公开不适用于所有数据变体的独特属性、方法和事件。此外，如果您可以依赖具体类型，它会大大简化绑定和模板。
【讨论】：
非常感谢您提供如此详细的答案和解决方案。它工作得很好。并感谢有关数据类型实现的建议。以上是关于DataGrid 或 GridView CellTemplate 中的动态内容的主要内容，如果未能解决你的问题，请参考以下文章
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