C# Excel Interop图表图例显示字符串格式而不是值

using Excel = Microsoft.Office.Interop.Excel;

// 打开Excel文件
Excel.Application excelApp = new Excel.Application();
Excel.Workbook workbook = excelApp.Workbooks.Open("path_to_your_excel_file");

// 获取对工作表的引用
Excel.Worksheet worksheet = workbook.Worksheets[1];

// 获取对图表的引用
Excel.ChartObjects chartObjects = worksheet.ChartObjects();
Excel.ChartObject chartObject = chartObjects[1];
Excel.Chart chart = chartObject.Chart;

// 获取对图例的引用
Excel.Legend legend = chart.Legend;

// 获取对图例条目的引用
Excel.LegendEntries legendEntries = legend.LegendEntries();

// 将图例显示为数据系列的值而不是名称
foreach (Excel.LegendEntry legendEntry in legendEntries)
{
    Excel.LegendKey legendKey = legendEntry.LegendKey;
    legendKey.Delete();
}

// 保存并关闭Excel文件
workbook.Save();
workbook.Close();
excelApp.Quit();