1

问题

我正在使用数据的 xmlprovider 填充数据网格。加载后,我尝试根据“锁定”行和列的列表为“锁定”列和行着色。这里的“锁定”只是对特定行或列的视觉反馈,不用于进一步计算。虽然数据的加载工作正常,但我尝试了不同的解决方案来设置某些行和列的背景属性,方法是使用数据网格扩展中的扩展循环遍历所有单元格,并取得了喜忧参半的效果。

我尝试为 LOADED 事件中的单元格着色,但这显然并不总是有效。并且没有事件说:“您的数据已加载,先生,现在想做点什么”?

所以我为行和列着色的最后手段可能是使用带有 IMultiValueConverter 类的样式设置器。但我不清楚如何将正确的数据发送到转换器。

编码

这就是我现在所拥有的:

public partial class MainWindow : Window
{
    public ObservableCollection<Person> MyDynData { get; set; }

    // property representing the locked rows
    public List<int> LockedRows { get; set; }
    // property representing the locked colums
    public List<int> LockedColumns { get; set; }

    public MainWindow()
    {
        InitializeComponent();

        MyDynData = Person.GetData();
        LockedRows = new List<int>{1,3};
        LockedColumns = new List<int>{0};

        DataContext = this;
    }
}

public class Person
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Age { get; set; }

    public static ObservableCollection<Person>GetData()
    {
        return new ObservableCollection<Person>
        {
            new Person {Age = 19, FirstName = "John", LastName = "Gates"},
            new Person {Age = 25, FirstName = "Jill", LastName = "Vegas"},
            new Person {Age = 48, FirstName = "Bill", LastName = "Bates"},
            new Person {Age = 29, FirstName = "Agnes", LastName = "Henderson"},
            new Person {Age = 33, FirstName = "Jenny", LastName = "Giggles"}

        };
    }
}

XAML:

<Window x:Class="DatagridColRowLocker.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:converters="clr-namespace:DatagridColRowLocker"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.Resources>
            <converters:CellBackgroundConverter x:Key="CellBackgroundConverter"/>
        </Grid.Resources>

        <DataGrid ItemsSource="{Binding Path=MyDynData}" AutoGenerateColumns="True">
            <DataGrid.Resources>
                <Style x:Key="LockedCellStyle" TargetType="DataGridCell">
                    <Style.Setters>
                        <Setter Property="Background">
                            <Setter.Value>
                                <MultiBinding Converter="{StaticResource CellBackgroundConverter}">
                                    <Binding> ??? the current cell</Binding>
                                    <Binding> ??? List of locked columns</Binding>
                                    <Binding> ??? list of locked rows</Binding>
                                </MultiBinding>
                            </Setter.Value>
                        </Setter>
                    </Style.Setters>
                </Style>
            </DataGrid.Resources>
        </DataGrid>
    </Grid>
</Window>

单元格背景颜色转换器:

class CellBackgroundConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        var cell = (DataGridCell)values[0];
        var lockedColumns = (List<int>)values[1];
        var lockedRows = (List<int>)values[2];

        // how to get the row index? 
        var isLocked = lockedColumns.Contains(cell.Column.DisplayIndex);

        return (isLocked) ? new SolidColorBrush(Colors.LightGray) : new SolidColorBrush(Colors.White);
    }

    public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

概括

  • 如何在 xaml 中正确绑定我的值以使多转换器工作
  • 如果我将 datagridcell 传递给转换器,我可以获得 displaycolIndex 但不能获得 rowIndex,这是如何工作的?
4

2 回答 2

2

如果您希望样式适用于所有单元格,请去掉样式上的 x:Key。

以下是您要求的绑定:

<Style TargetType="DataGridCell">
    <Style.Setters>
        <Setter Property="Background">
            <Setter.Value>
                <MultiBinding Converter="{StaticResource CellBackgroundConverter}">
                    <Binding RelativeSource="{RelativeSource Self}" />
                    <Binding RelativeSource="{RelativeSource AncestorType=Window}" Path="DataContext.LockedColumns" />
                    <Binding RelativeSource="{RelativeSource AncestorType=Window}" Path="DataContext.LockedRows" />
                    <Binding RelativeSource="{RelativeSource AncestorType=DataGridRow}" />
                </MultiBinding>
            </Setter.Value>
        </Setter>
    </Style.Setters>
</Style>

以下是转换器的更改:

public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
    var cell = (DataGridCell)values[0];
    var lockedColumns = (List<int>)values[1];
    var lockedRows = (List<int>)values[2];
    var row = (DataGridRow)values[3];

    // how to get the row index? 
    var isLocked = lockedColumns.Contains(cell.Column.DisplayIndex);
    if (!isLocked)
    {
        isLocked = lockedRows.Contains(row.GetIndex());
    }

    return (isLocked) ? new SolidColorBrush(Colors.LightGray) : new SolidColorBrush(Colors.White);
}
于 2014-05-14T12:44:37.063 回答
0

除了接受的答案之外,您可能会在选择一行时看到样式问题,如下图所示。“Bill”右边的文字是白色的,不可读

在此处输入图像描述

在这种情况下,您可以通过为数据网格添加额外的资源设置来解决此问题:

<DataGrid.Resources>
    <SolidColorBrush x:Key="{x:Static SystemColors.HighlightTextBrushKey }" Color="Black"></SolidColorBrush>
    <SolidColorBrush x:Key="{x:Static SystemColors.HighlightBrushKey}" Color="Transparent"></SolidColorBrush>
</DataGrid.Resources>
于 2014-05-21T10:37:24.237 回答