Question

我有一个包含数百行和两列数据的DataGrid。我需要以编程方式选择DataGrid中的某些行和某些特定单元格，并将它们输出到Excel工作表上。在做了一些研究之后，获得Cell Value的唯一方法就是编写一个辅助函数，并且每次获得一个单元格值时都会运行辅助函数。

是否有更简单/更快捷的方法来获取DataGrid中特定单元格的值？或者我是否应该将每个单元格值同时存储到数组中，当它转到DataGrid并将数组输出到Excel而不是DataGrid时？

Answer 1

我们假设DataGrid显示员工信息，我们存储他Id，Name和Address的每位员工。让我们为每个员工属性添加一个额外的布尔属性（例如Id和IsIdSelected，Name和IsNameSelected）此布尔属性将绑定到DataGrid.IsSelected属性因此，它表示是否选择了单元格，您还可以通过将其设置为True来使用它来以编程方式选择显示指定属性的单元格。请参阅以下代码：

/// <summary>
/// A class that represents an employee. Notice that with each property
/// (e.g. Id) there is a Boolean property that has a similar name (e.g. IsIdSelected)
/// this Boolean property will be bound to the relevant DataGridCell.IsSelected
/// property to indicate whether the cell representing this property were selected
/// or not. In other words if you want to know the selected properties at any moment
/// you just need to iterate through the employees collection, and examine each
/// Boolean property for each property :D
/// </summary>
public class Employee
{
    public int? Id { get; set; }
    public bool IsIdSelected { get; set; }

    public string Name { get; set; }
    public bool IsNameSelected { get; set; }

    public string Address { get; set; }
    public bool IsAddressSelected { get; set; }
}

背后的代码：

using System.Collections.ObjectModel;
using System.Windows;

namespace CellSelection
{
    public partial class MainWindow : Window
    {
        /// <summary>
        /// The DataGrid will be bound to this collection
        /// </summary>
        private ObservableCollection<Employee> _collection;

        public MainWindow()
        {
            InitializeComponent();

            // Initialize the employees collection with some test data
            _collection =
                new ObservableCollection<Employee>
                    {
                        new Employee {Id = 1, Name = "Mohammed A. Fadil", Address = "..."},
                        new Employee {Id = 485, Name = "Khalid Zein", Address = "..."},
                        new Employee {Id = 64, Name = "Ahmed Mubarak", Address = "..."},
                        new Employee {Id = 364, Name = "Ali Ebraheim", Address = "..."},
                    };

            DataContext = _collection;
        }

        private void OnExportButtonClick(object sender, RoutedEventArgs e)
        {
            // Now, concatinate all the selected cells
            var str = string.Empty;
            foreach (var emp in _collection)
            {
                if (emp.IsIdSelected)
                    str += string.Format("{0}, ", emp.Id);

                if (emp.IsNameSelected)
                    str += string.Format("{0}, ", emp.Name);

                if (emp.IsAddressSelected)
                    str += string.Format("{0}", emp.Address);

                str += "\n";
            }
            // Instead of displaying this message you could export these cells to Excel
            // in the format you need.
            MessageBox.Show(str);
        }
    }
}

XAML代码：

<Window x:Class="CellSelection.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="275*" />
            <RowDefinition Height="36*" />
        </Grid.RowDefinitions>
        <DataGrid ItemsSource="{Binding}" AutoGenerateColumns="False"
                  SelectionMode="Extended" SelectionUnit="CellOrRowHeader">
            <DataGrid.Columns>

                <DataGridTextColumn Header="Id" Binding="{Binding Id}">
                    <DataGridTextColumn.CellStyle>
                        <Style TargetType="DataGridCell">
                            <Setter Property="IsSelected">
                                <Setter.Value>
                                    <Binding Path="IsIdSelected" Mode="TwoWay"
                                             UpdateSourceTrigger="PropertyChanged"/>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </DataGridTextColumn.CellStyle>
                </DataGridTextColumn>

                <DataGridTextColumn Header="Name" Binding="{Binding Name}">
                    <DataGridTextColumn.CellStyle>
                        <Style TargetType="DataGridCell">
                            <Setter Property="IsSelected">
                                <Setter.Value>
                                    <Binding Path="IsNameSelected" Mode="TwoWay"
                                             UpdateSourceTrigger="PropertyChanged"/>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </DataGridTextColumn.CellStyle>
                </DataGridTextColumn>

                <DataGridTextColumn Header="Address" Binding="{Binding Address}">
                    <DataGridTextColumn.CellStyle>
                        <Style TargetType="DataGridCell">
                            <Setter Property="IsSelected">
                                <Setter.Value>
                                    <Binding Path="IsAddressSelected" Mode="TwoWay"
                                             UpdateSourceTrigger="PropertyChanged"/>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </DataGridTextColumn.CellStyle>
                </DataGridTextColumn>
            </DataGrid.Columns>
        </DataGrid>
        <Button Content="Export Selection" Grid.Row="1" HorizontalAlignment="Right"
                Click="OnExportButtonClick" Margin="5"/>
    </Grid>
</Window>

请注意，对于每个DataGrid列，您必须添加一个CellStyle，将指定布尔属性的每个列绑定到它的DataGridCell.IsSelected属性，将此绑定模式设置为Mode="TwoWay" in - 以支持以编程方式选择单元格（在这种情况下，您必须在INotifyPropertyChanged类上实现Employee。

使用此解决方案，您既不需要辅助函数也不再需要访问DataGrid个实际单元格，只需遍历集合，确定所选属性并根据需要处理它们。

Answer 2

我以前使用过Clipboard类，您可以从网格中获取逗号分隔值，然后将其保存为CSV，然后从Excel中打开它。我想这可能取决于你使用什么样的网格控制

MSDN On Clipboard

在DataGrid中选择多个单元格并输出到Excel工作表

2 个答案: