将DataGrid表导出到MS Excel时，数据显示为System.Data.DataRowView

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using System.IO;

// 获取DataGrid中的数据源
var dataGridItemsSource = dataGrid.ItemsSource as IEnumerable;

// 创建一个新的Excel文件
var workbook = new HSSFWorkbook();
var sheet = workbook.CreateSheet("Sheet1");

// 写入表头
var headerRow = sheet.CreateRow(0);
for (int i = 0; i < dataGrid.Columns.Count; i++)
{
    var cell = headerRow.CreateCell(i);
    cell.SetCellValue(dataGrid.Columns[i].Header.ToString());
}

// 写入数据
int rowIndex = 1;
foreach (var item in dataGridItemsSource)
{
    var dataRow = sheet.CreateRow(rowIndex);
    for (int i = 0; i < dataGrid.Columns.Count; i++)
    {
        var cell = dataRow.CreateCell(i);
        var binding = dataGrid.Columns[i].ClipboardContentBinding as System.Windows.Data.Binding;
        var propertyPath = binding.Path.Path;
        var propertyInfo = item.GetType().GetProperty(propertyPath);
        var value = propertyInfo.GetValue(item);
        cell.SetCellValue(value?.ToString());
    }
    rowIndex++;
}

// 导出Excel文件
using (var fileStream = new FileStream("ExportedData.xls", FileMode.Create))
{
    workbook.Write(fileStream);
}