WPF DataGrid从DataGridCell样式绑定到当前对象属性

时间:2014-05-13 12:21:46

标签: c# wpf data-binding wpfdatagrid

我的下面示例工作正常,当Id.Updated属性为true时,它突出显示Id列中的单元格。

我想知道如何修改绑定表达式Binding="{Binding Id.Updated}",以便在正确的列(不仅是Id)中绑定到当前Updated对象的IssueElement属性一个)。

我希望能够为所有列只使用一种样式,而不是每列一种样式。

以下示例是DataGrid在我的应用程序中的工作方式的简化版本。

DataGrid:

<DataGrid ItemsSource="{Binding IssueList}" AutoGenerateColumns="False" >
    <DataGrid.Resources>
        <Style x:Key="TestStyle" TargetType="{x:Type DataGridCell}">
            <Style.Triggers>
                <DataTrigger Binding="{Binding Id.Updated}" Value="True">
                    <Setter Property="Background" Value="Green" />
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGrid.Resources>   
    <DataGrid.Columns>
        <DataGridTextColumn Header="Id" Binding="{Binding Id.Value}" CellStyle="{StaticResource TestStyle}" />
        <DataGridTextColumn Header="Title" Binding="{Binding Title.Value}" CellStyle="{StaticResource TestStyle}" />
        <DataGridTextColumn Header="Body" Binding="{Binding Body.Value}" CellStyle="{StaticResource TestStyle}" />
    </DataGrid.Columns>
</DataGrid>

收藏品:

private ObservableCollection<Issue> mIssueList;
public ObservableCollection<Issue> IssueList
{
    get { return mIssueList; }
    set { mIssueList = value; OnPropertyChanged("IssueList"); }
}

集合使用的类

public class Issue
{
    public IssueElement Id { get; set; }
    public IssueElement Title { get; set; }
    public IssueElement Body { get; set; }
}

public class IssueElement
{
    public string Value { get; set; }
    public bool Updated { get; set; }
}

提前致谢

1 个答案:

答案 0 :(得分:2)

我不确定为什么你的绑定中有One.Value,Two.Value,Three.Value。我想你的意思是Id.Value,Title.Value和Body.Value,对吗?

我认为你能做到这一点的唯一方法就是使用转换器。 这是一种方法:

<DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Converter={StaticResource UpdatedConverter}}" Value="True">
    <Setter Property="Background" Value="Green" />
</DataTrigger>

转换器:

public class UpdatedConverter : IValueConverter
{
    #region IValueConverter Members

    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        DataGridCell dgc = value as DataGridCell;
        if (dgc != null)
        {
            Issue data = dgc.DataContext as Issue;
            if (data != null)
            {
                DataGridTextColumn t = dgc.Column as DataGridTextColumn;
                if (t != null)
                {
                    var binding = t.Binding as System.Windows.Data.Binding;
                    if (binding != null && binding.Path != null && binding.Path.Path != null)
                    {
                        string val = binding.Path.Path.ToLower();
                        if (val.StartsWith("id"))
                            return data.Id.Updated;
                        if (val.StartsWith("title"))
                            return data.Title.Updated;
                        if (val.StartsWith("body"))
                            return data.Body.Updated;
                    }
                }
            }
        }
        return false;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException();
    }

    #endregion
}