在运行时绑定属性

Question

我已经在我的程序中创建了一个 UserControl 以实现可重用性：

GroupPanel.xaml:

  <UserControl x:Class="View.UserControls.GroupPanel"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"assembly=ViewModel"
             Name="root">
    <DockPanel>
        <DataGrid DockPanel.Dock="Top"
                  AutoGenerateColumns="False"
                  CanUserAddRows="True"
                  CanUserDeleteRows="False"
                  CanUserReorderColumns="False"
                  DataContext="{Binding ElementName=root}"
                  ItemsSource="{Binding DataGridItemSource}"
                  Name="mainGrid">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Nr/Unit"
                                    Binding="{Binding Nr}" />
                <DataGridTextColumn Header="Text"
                                    Binding="{Binding Text}" />
                <DataGridTextColumn Header="Comment"
                                    Binding="{Binding Comment}" />
                <DataGridTemplateColumn>
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <StackPanel Orientation="Horizontal">
                                <Button Content="Delete" />
                            </StackPanel>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
            </DataGrid.Columns>
        </DataGrid>
    </DockPanel>

和一个依赖项属性来设置 DataGrid 的 ItemsSource:

GroupPanel.xaml.cs:

public static readonly DependencyProperty DataGridItemSourceProperty =
        DependencyProperty.Register("DataGridItemSource", typeof(IEnumerable), typeof(GroupPanel),
                                    new PropertyMetadata(null));

    public IEnumerable DataGridItemSource
    {
      get { return (IEnumerable)GetValue(DataGridItemSourceProperty); }
      set { SetValue(DataGridItemSourceProperty, value); }
    }

我有一个 window，我需要使用不同的 ItemsSources 绑定此 UserControl 2 次。但是两个来源在第一个属性之前都具有相同的属性。来源是：

GroupNumber:
Number, int
Text, string
Comment, string

GroupUnit:
Unt, int
Text, string
Comment, string

两者的行为相同。有没有办法根据 ItemsSource 设置 1 DataGrid 列的绑定？

我试过这样的事情：

    void GroupPanel_Loaded(object sender, RoutedEventArgs e)
    {
      var type = DataGridItemSource.GetType();
      if(type.FullName.Contains("GroupNumber"))
      {

      }
    }

但我不知道如何在 if...

中设置列绑定

提前致谢

Answer 1

您可以将另一个依赖项属性添加到您的 GroupPanel 用户控件：

public string FirstColumnBindingPropertyName
{
    get { return (string)GetValue(FirstColumnBindingPropertyNameProperty); }
    set { SetValue(FirstColumnBindingPropertyNameProperty, value); }
}

public static readonly DependencyProperty FirstColumnBindingPropertyNameProperty =
    DependencyProperty.Register("FirstColumnBindingPropertyName", typeof(string), typeof(GroupPanel), new UIPropertyMetadata(null, new PropertyChangedCallback(OnFirstColumnBindingPropertyNameChanged)));


private static void OnFirstColumnBindingPropertyNameChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
{
    GroupPanel groupPanel = (GroupPanel)dependencyObject;
    DataGridTextColumn dataGridTextColumn = groupPanel.mainGrid.Columns[0] as DataGridTextColumn;
    if (args.NewValue == null)
    {
        dataGridTextColumn.Binding = null;
    }
    else
    {
        dataGridTextColumn.Binding = new Binding(Convert.ToString(args.NewValue));
    }
}

那么在你的 window 中你将拥有：

<local:GroupPanel FirstColumnBindingPropertyName="Number" />
<local:GroupPanel FirstColumnBindingPropertyName="Unt" />

Answer 2

您可以使用 DataTemplateSelector。请参考以下代码。

<Window x:Class="DataTemplateSelector_Learning.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:DataTemplateSelector_Learning"
    Title="MainWindow" Height="350" Width="525">
<Window.Resources>
    <DataTemplate x:Key="GroupNumber">
        <TextBlock Text="{Binding Number}"/>
    </DataTemplate>
    <DataTemplate x:Key="GroupUnit">
        <TextBlock Text="{Binding Unit}" />
    </DataTemplate>
</Window.Resources>
<StackPanel>
    <DataGrid DockPanel.Dock="Top"
              AutoGenerateColumns="False"
              CanUserAddRows="False"
              CanUserDeleteRows="False"
              CanUserReorderColumns="False"                  
              Name="numGrid">
        <DataGrid.Columns>
            <DataGridTemplateColumn Header="GroupNumber">
                <DataGridTemplateColumn.CellTemplateSelector>
                    <local:GroupTemplateSelector 
                        GroupNumber="{StaticResource GroupNumber}"
                        GroupUnit="{StaticResource GroupUnit}"/>
                </DataGridTemplateColumn.CellTemplateSelector>
            </DataGridTemplateColumn>
            <DataGridTextColumn Header="Text"
                                Binding="{Binding Text}" />
            <DataGridTextColumn Header="Comment"
                                Binding="{Binding Comment}" />
            <DataGridTemplateColumn>
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <Button Content="Delete" />
                        </StackPanel>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
        </DataGrid.Columns>
    </DataGrid>
    <DataGrid DockPanel.Dock="Top"
              AutoGenerateColumns="False"
              CanUserAddRows="False"
              CanUserDeleteRows="False"
              CanUserReorderColumns="False"                  
              Name="unitGrid">
        <DataGrid.Columns>
            <DataGridTemplateColumn Header="GroupUnit">
                <DataGridTemplateColumn.CellTemplateSelector>
                    <local:GroupTemplateSelector 
                        GroupNumber="{StaticResource GroupNumber}"
                        GroupUnit="{StaticResource GroupUnit}"/>
                </DataGridTemplateColumn.CellTemplateSelector>
            </DataGridTemplateColumn>
            <DataGridTextColumn Header="Text"
                                Binding="{Binding Text}" />
            <DataGridTextColumn Header="Comment"
                                Binding="{Binding Comment}" />
            <DataGridTemplateColumn>
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <StackPanel Orientation="Horizontal">
                            <Button Content="Delete" />
                        </StackPanel>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
        </DataGrid.Columns>
    </DataGrid>
</StackPanel>

 public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        ObservableCollection<GroupNumber> lstNum = new ObservableCollection<GroupNumber>();
        lstNum.Add(new GroupNumber() { Number=1,Text="Test",Comment="Comment"});
        numGrid.ItemsSource = lstNum;
        ObservableCollection<Groupunit> lstUnit = new ObservableCollection<Groupunit>();
        lstUnit.Add(new Groupunit() { Unit = 2, Text = "Test", Comment = "Comment" });
        unitGrid.ItemsSource = lstUnit;
    }
}

public class GroupTemplateSelector : DataTemplateSelector
{
    public DataTemplate GroupNumber
    { get; set; }

    public DataTemplate GroupUnit
    { get; set; }

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {            
        if (item is GroupNumber)
        {
            return GroupNumber;
        }
        else if (item is Groupunit)
        {
            return GroupUnit;
        }

        else
            return base.SelectTemplate(item, container);
    }

}

public class GroupNumber
{
    private int number;

    public int Number
    {
        get { return number; }
        set { number = value; }
    }

    private string text;

    public string Text
    {
        get { return text; }
        set { text = value; }
    }

    private string comment;

    public string Comment
    {
        get { return comment; }
        set { comment = value; }
    }      
}

public class Groupunit
{
    private int unit;

    public int Unit
    {
        get { return unit; }
        set { unit = value; }
    }

    private string text;

    public string Text
    {
        get { return text; }
        set { text = value; }
    }

    private string comment;

    public string Comment
    {
        get { return comment; }
        set { comment = value; }
    }
}

在运行时绑定属性

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在运行时绑定属性