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。 经过一番研究，似乎获得单元格值的唯一方法是编写一个辅助函数，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/更快的方法来获取 DataGrid 中特定单元格的值？或者我应该在每个单元格值转到 DataGrid 并将数组输出到 Excel 而不是 DataGrid 时同时将其存储到数组中？
【问题讨论】：
标签： c# wpf datagrid datagridcell
假设DataGrid显示员工信息，对于每个员工，我们存储他的Id、Name和Address。让我们为每个员工属性（例如Id 和IsIdSelected、Name 和IsNameSelected）添加一个额外的布尔属性，这个布尔属性将绑定到DataGrid.IsSelected 属性，因此，它表示单元格是否被选中与否，您也可以通过将其设置为True，以编程方式使用它来选择显示指定属性的单元格。见以下代码：
/// <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，它将每个指定布尔属性的列绑定到它的DataGridCell.IsSelected 属性，将此绑定模式设置为Mode="TwoWay" 以支持以编程方式选择单元格（在这种情况下，您必须在 Employee 类上实现 INotifyPropertyChanged。
使用此解决方案，您不再需要帮助函数，也不再需要访问 DataGrid 实际单元格，只需遍历您的集合，确定选定的属性并根据需要处理它们。
【讨论】：
我过去使用过剪贴板类，您可以在其中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。我想这可能取决于您使用哪种网格控制
【讨论】：